Friday, 16 September 2022

Callistoctopus xiaohongxu: A new species of Octopus from the southeast coast of China.

The waters of the South and East China seas are kept warm year round by the Kuroshio, South China Sea, and Taiwan currents, which constantly bring in water from close to the equator, keeping the water off much of the Chinese coast in the 14-16° range even in the coldest months of winter. This is favourable for many marine organisms, creating a biodiversity hotspot in the region. 

In a paper published in the journal ZooKeys on 12 September 2022, Xiaodong Zheng, Chenxi Xu, and Jiahua Li, of the Institute of Evolution and Marine Biodiversity and the KeyLaboratory of Mariculture at the Ocean University of China, describe a new species of Octopus from the coast of Fujian Province, China.

The new species is assigned to the genus Callistoctopus, which was separated from the genus Octopus in 1993 to accommodate a group of four species, two of which are known from Chinese coastal waters, and given the specific name xiaohongxu, the name under which it was being traded at Dongshan Seafood Market Pier, where it came to the attention of of the scientists, and which implies that it is small and red.

Callistoctopus xiaohongxu, holotype, male, 45.5 mm mantle length (OUC-201808200301). (A) Photograph of dorsal view. (B) photograph of ventral view. Scale bar is 10 mm. Zheng et al. (2022).

Callistoctopus xiaohongxu is a small Octopus, reaching a mantle length of 42.7-83.3 mm, with arms 154.9-336.3 mm long. Each arm has two lines of dark pigment cells on its lateral margin, and two rows of small suckers.

Callistoctopus xiaohongxu. (Top) Live specimen. (Bottom) Net-like structure on web. Zheng et al. (2022).

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Wednesday, 14 September 2022

Neptune at opposition.

The planet Neptune will reach opposition (i.e. be directly opposite the Sun seen from Earth) on Friday 16 September 2022 at 10.12 pm GMT. This means that it will both be at its closest to the Earth this year, about 28.93 AU (28.96 times the average distance between the Earth and the Sun, or about 4 328 336 000 km), and completely illuminated by the Sun. While it is not visible to the naked eye observer, the planets have phases just like those of the Moon; being further from the Sun than the Earth, Neptune is 'full' when directly opposite the Sun. As this falls the day before the Third Quarter Moon (i.e. the day on which the Moon is half full following a Full Moon) on 17 September, the prospects for viewing for those equipped with suitable telescopes is not as good as it might be. The planet will be in the constellation of Aquarius and at its highest point in the sky at about midnight local time from anywhere on Earth.

The relative positions of the Earth and the planets of the Outer Solar System on 16 September 2022.  JPL Small Body Database

Neptune orbits the Sun at an average distance of 30.11 AU, completing one orbit around the Sun every 165 years. This means that the planet is almost stationary compared to the faster moving Earth, so that it reaches Opposition only four days later each year than the year before, and reaches Solar Conjunction (when it is directly on the opposite side of the Sun to the Earth), roughly six months later.

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Tuesday, 13 September 2022

Portfjeldia aestatis: An enigmatic tubular microfossil from the Late Ediacaran Portfjeld Formation of North Greenland.

The Late Ediacaran layers of the Portfjeld Formation of North Greenland produce an array of phosphatised microfossils, including embryo-like forms, comparable to those from the Doushantuo Biota of Weng’an in South China, Acritarchs, Cyanobacteria, and some enigmatic helically coiled threads which have tentatively also been assigned to the Cyanobacteria.

Tubular and cylindrical fossils are comparatively common in the Proterozoic. Macroscopic forms begin in the Mesoproterozoic (1600 to 1000 million years ago) with fossils such as the carbonaceous Tawuia, which first appears in the Chorat Sandstone of Central India and persists into the Ediacaran, with a more diverse assemblage appearing in the Ediacaran, including the carbonaceous Sabellidites, and the mineralised Cloudina. Rod-like and filamentous tubular microfossils also become abundant in the Ediacaran, although these can be hard to classify due to the wide range of preservation methods, including compressions, casts, molds, and replacement fossils in silica and phosphatic materials.

Interpreting such simple fossils is difficult, and suggestions for their origin have included Bacterial colonies, filamentous Algae, and early Animals, possibly related to Annelids or Cnidarians.

A number of nonbranching and helically coiled tubular microfossils from the Portfjeld Formation have previously been described under the name Jiangispirellus groenlandicus, with has annulations, and Spirellus, which lacks annulations and has an enclosing, often calcified sheath, both of which have been interpreted as Cyanobacteria.

In a paper published in the Journal of Paleontology on 2 June 2022, Sebastian Willman and John Peel of the Department of Earth Sciences at Uppsala University, describe a new tubular microfossil from the Portfjeld Formation of North Greenland.

The description is based upon material collected by John Peel and Peter Frykman in July 1978, from an outcrop of the Portfjeld Formation on the north side of Wandel Dal, west of Øvre Midsommersø, the western of the two lakes comprising the Midsommersøer.

Simplified geological map and lithostratigraphic column of the Portfjeld Formation. (1) Geological map showing the sampling site at the western end of Midsommersøer in North Greenland; (2) lithostratigraphic column through the Portfjeld Formation at eastern Midsommersøer where the fossiliferous horizon is located at a lower level than in the fossil locality at western Midsommersøer. Willman & Peel (2022).

The microfossil is named Portfjeldia aestatis, where 'Portfjeldia' is a reference to the Portfjeld Formation, and 'aestatis' means summer, a reference to the location where it was found (Midsommersøer means 'Midsummer-lakes'). Portfjeldia aestatis is a cresent-shaped annulated tubular fossil with two or three slender, slowly expanding, internal tubules. The annulations on the external surface do not appear to correspond to any form of internal segmentation. The tube is not circular in cross section, and has longitudinal groves where it it adpressed against the internal tubules, probably implying that it was flexible in life. The internal tubules run parallel to one-another along the entire length of the preserved outer tubes. The best preserved section of tube, designated as the holotype, is about 400 μm in length, and about 45 μm wide, with the inner tubules being about 20 μm wide with an internal cavity about 10 μm wide.

Holotype of Portfjeldia aestatis and other unnamed tubular fossils showing various types of similar internal structures: (1)–(5) Portfjeldia aestatis (PMU 36870/2) from various viewpoints displaying two tubules interpreted as being originally enclosed by a now partly degraded external sheath; (3) enlargement of lower left of (4) with lines indicating three tubes rather than two, indicating a possible triradial symmetry; arrows in (2) and (4) show possible branching and development of daughter tube; (5) possible third tubule originating as a ridge near the other extremity. (6) Broken tube (PMU 39237/1), possibly related to the problematic spiral tube also described; arrow indicates internal groove also visible in (4). (7) Broken tube (PMU 38168/2) showing three possible tubules indicating a triradial structure (white lines). (8) Single whorl of a degraded, annulated helix with internal tubular structure (arrow) (PMU 36876/4). Scale bar 100 μm for (1), (2), (6)–(8) and 50 μm for (3)–(5). Willman & Peel (2022).

Willman and Peel also describe another distinctive tubular microfossil, but decline to name this as only a single specimen is known, and this was found within the helical coil of a specimen of Jiangispirellus groenlandicus, making it impossible to say there is not a relationship between the two. This specimen is almost 2 mm in length, with a diameter of about 20 μm, and a central opening running along its length about 10 μm in diameter.

Problematic helically spiraled tubular organism. (1), (2) Preserved as an internal tube inside an outer Jiangispirellus 'trichome', showing traces of cell wall (PMU 36870/3); (3) remains of a possible branching organism (arrow) within a 'trichome' (PMU 36868/4); (4) preserved 'trichome' of Jiangispirellus groenlandicus with internal secondary phosphatisation (PMU36874/5). Note that no internal septa are preserved, indicating that the phosphatised 'trichome' covered a hollow chamber. Scale bar 100 μm for (1), (3), (4) and 50 μm for (2). Willman & Peel (2022).

Ediacaran deposits have produced a wide range of tubular fossils of varying sizes, and debatable origins. The majority of the larger tubes are likely to have been produced by Metazoans (Animals), and some may have been biomineralised. As such, understanding these tubes is thought to be a key step to understanding the origin of the Animals as a whole. Many of these macroscopic fossils share morphological similarities to the microfossils Willmand and Peel describe from the Portfjeld Formation, being slightly-curved to sinuous, and occasionally branching. However, the macro- and microfossils are not identical in morphology, which, combined with the size difference between the two groups, makes it impossible to say if they are genuinely related or just show convergent morphology.

Microscopic tubular and filamentous fossils have variously been interpreted as Cyanobacteria, Algae, and Fungi. It is seldom even possible to say with any confidence whether these tubes were made by prokaryotic or eukaryotic organisms, due to the overlap in size between the two groups, although a number of 'grades' of structure have been proposed to try to separate different groups of tube-makers.

Tubes of sizes similar to the ones Willman and Peel describe from the Portfjeld Formation are known to be made by extant Cyanobacteria, such as Microcoleus, and Schizothrix, as well as sulphur-oxidizing Bacteria such as Thioploca. Forms such as the extant Trichodesmium even form bundles of filaments, as seen in Portfjeldia aestatis, and Subtifloria, an Ediacaran-Cambrian calcarious fossil comprising bundles of filaments, also interpreted as a Cyanobacteria. However, such bundles of filaments are not usually contained within an outer sheaf, and it is difficult to imagine what the advantage of such a sheaf would be to a photosynthetic Cyanobacterium.

Subtifloria is known from the Late Eidacaran deposits of Shaanxi Province, China, where it forms part of an assemblage that also includes forms interpreted as Oscillatorialean and Rivulariacean Cyanobacteria, some of the most complex members of the group today. The Shaanxi and Portfjeld Ediacaran biotas both contain Obruchevella, a helical microfossil possibly also made by a Cyanobacterium, as well as Jiangispirellus and Spirellus, suggesting a possible link between the two sites. 

Complex modern Cyanobacteria, such as those of the Order Nostocales, develop distinctive resting cells towards the end of their annual growth cycle, which can produce new filaments when conditions improve again, building up Cyanobacterial mats over time. The specimens from Portfjeld appear to be of a much more complicated nature than anything seen in such Cyanobacteria, and may well themselves be part of a larger and mote complex organism, making it unlikely the fossils are of Cyanobacterial origin.

The organism found preserved within the coil of a specimen of Jiangispirellus groenlandicus could be interpreted as a specimen of that organism, but for the presence of an internal cavity. Again, its general morphology is consistent with a Cyanobacterial origin, but its position within the coil of another calcified organism seems unlikely for anything which was reliant on photosynthesis to survive.

Eukaryotic Algae are important members of many modern ecosystems, both aquatic and terrestrial, and come in a wide range of forms. Neoproterozoic Algae can usually be identified either by a branching structure or the presence of more than one type of cell. The earliest form of multicellular Eukaryotic Algae, filamentous Red Algae, probably appeared at around the beginning of the Mesoproterozoic (1600 million years ago), while the first filamentous Green Algae probably appeared at around the beginning of the Neoproterozoic, about 1000 million years ago. The general shape and size of  Portfjeldia aestatis, this appears quite likely to be an Algae, although the internal tubules are unlike anything known from any Algal group, living or fossil.

Ediacaran deposits contain a wide variety of macrofossils which may-or-may-not represent early Animals. However some, such as the bilaterally symetrical Kimberella, are now generally accepted as being true Animals, in addition to which trace fossils have been found at a number of Ediacaran sites, leading to the possibility that fossils from Ediacaran deposits may represent Animals or parts of Animals. 

Mineralised tubular fossils are also common in the Ediacaran, and an Animal origin has been suggested for many of these, such as the Anabaritids, globally distributed tubular organisms that grew by accretion around the aperture and showed a triradial symmetry, which have been suggested as possible stem-group Cnidarians.

Another possibility is that the inner tubules of Portfjeldia aestatis are not part of the same organism as the outer tubes, but some form of cavity dwelling micro-organism which has secondarily occupied the tubes. Such behaviour is found in a variety of different organisms, including Bacteria, Algae, and Fungi. Such organisms will often occupy tubes created by other organisms, although the filamentous shape of Portfjeldia aestatis is unlike any known such organism, which tend to be more mesh-like in organisation, on which basis Willman and Peel consider this to be an unlikely scenario.

Given the possible alternatives, Willman and Peel believe that the most likely explanation is that Portfjeldia aestatis is some form of Algae, albeit one unlike any modern form. 

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Sunday, 11 September 2022

Methanofollis propanolicus: A novel methanogenic Archaean from an oil well in Costa Rica.

Archaeans are Prokaryotic micro-organisms resembling Bacteria, but only distantly related to them, and more closely related to Eukaryotes. The Methanomicrobiales are a group of Archaeans which produce methane through reductive reactions, typically obtaining carbon from carbon dioxide, although there are some exceptions. Members of the genus Methanofollis, for example, produce methane by the reduction of alcohols, typically using acetate as a carbon-donor.

In a paper published in the journal Archives of Microbiology on 13 August 2022, Linda Dengler, Julia Meier, Felix Grünberger, and Annett Bellack of the Institute of Microbiology and Archaea Centre at the University of Regensburg, Reinhard Rachel of the Electron Microscopy Center at the University of Regensburg, and Dina Grohmann and Harald Huber, also of the Institute of Microbiology and Archaea Centre at the University of Regensburg, describe a new species of Methanofollis from an oil well in Costa Rica.

The new species was isolated from an exploratory drill well sunk in the Cahuita National Park, on the southwestern Atlantic coast of Costa Rica. The well is now a stagnant pool, with the new species being taken from an anaerobic layer 30 cm beneath the surface. 

Ancient oil well in the Cahuita National Park, Costa Rica, original sampling site of strain CaP3V-MF-L2AT. Dengler et al. (2022).

The new species, initially identified as strain CaP3V-MF-L2AT, was found to be able to metabolise propanol with acetate producing methane. It was unable to metabolise acetate on its own, nor acetate with methanol, ethanol, butanol, or cyclopentanol. It was found by genetic analysis to be a new species within the genus Methanofollis, and given the specific name propanolicus, in reference to its obligate metabolising of propanol.

(a) Transmission electron micrograph of freeze-etched cells of strain CaP3V-MF-L2AT indicating (b) proteinaceous S-Layer (SL) and an archaellum (AR). Scale bars are 200 nm. Dengler et al. (2022).

Cells of Methanofollis propanolicus are irregularly coccoid (roughly spherical),  0.8–1.8 μm in diameter, and found singularly or in pairs. They are have two types of appendages; archaella (a filament attached to the cell membrane by a molecular motor, used to propel some forms of Archaea in a swimming-like motion) with a diameter of about 12 nm, and pili (hair-like structures found on both Bacteria and Archaea, which can have a variety of functions), with diameters of about 8 nm.

Transmission electron micrograph of Pt/C shadowed cells of strain CaP3V-MF-L2AT show the great variability in cell-shape as well as archaella. Scale bar is 400 nm. Dengler et al. (2022).

Although only propanol and acetate were necessary for the survival of Methanofollis propanolicus, the species did better in the presence of yeast-extract. It was able to grow at temperatures of 25-40°C, with optimum growth at 37°C. The species was able to tolerate salinities in the range 0-2.5% weight/volume sodium chloride, with optimum growth at 0.2-1.5%. Methanofollis propanolicus was able to grow at pH values in the range 6.0-7.5, with optimum growth in the range 6.5-7.0.

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Saturday, 10 September 2022

At least 32 million people displaced as one third of Pakistan covered by floodwaters.

At least 32 million people are thought to have been displaced as one third of Pakistan has been covered by floodwaters this month, with some estimates placing the figure as high as 50 million. At this time almost 1400 people are known to have died in the floods, including over 400 children. Experts at the Aga Khan University in Karachi have estimated that at least 650 000 pregnant women are among the displaced, with about 70 000 due to give birth in the next month. Estimates of the number of people who will have permanently lost their homes varies between 500 000 and a million.

Flooding in the Dadu District of Sindh Province, Pakistan. Fareed Khan/AP.

The flooding events are thought to be directly linked to rising global temperatures, with the monsoon rains, which began to fall in the middle of June, being the heaviest ever recorded in the country, 4.64 times the average rainfall for the past 30 years. The problem has been exaggerated by melting glaciers in the Himalayas. Seasonal glacial melting is normal feature of the region, but these glaciers are now melting at a much higher rate, leading both to flood events now, and fears that they will disappear in the near future, leading to a much shorter crop-growing season as water availability becomes entirely reliant on the monsoon. Pakistan's previous worst ever flood event occurred in 2010, when the flow of water on the Indus River reached over 11.3 million litres per second; this year it is expected to pass 19.8 million litres per second.

Sindh Province, Pakistan, where the River Indus has burst its banks creating a lake over 100 km wide. Reuters.

As well as the immediate effects of the flooding, there are concerns about the impact this will have on the people of Pakistan both in the coming winter and the longer term. Around 80% of the crops in Sindh Province are thought to have been destroyed, and the vast amounts of standing water left by the flooding are likely to lead to epidemics of Malaria and water-born diseases. The loss of crops is likely to impact not just Pakistan's ability to feed itself, but the loss of much of the revenue earned from growing Cotton, and the accompanying loss of income from manufacturing garments. The flooding is also calculated to have killed over 750 000 head of livestock, over 5700 km of roads and almost 250 bridges. The United Nations has launched an appeal for US$160 million to get Pakistan over the immediate crisis, but has warned that the country is likely to suffer direct economic losses in excess of US$30 billion as a result of the floods, and that the cost of rebuilding the country will cost much more. 

Flooding close to Lake Manchar in Sindh Province, which has also burst its banks. Getty Images.

Pakistan is the world's fifth most populous country, with a population of 220 million, and considered to be one of the ten countries most vulnerable to global warming by the United Nations, despite producing only about 1% of the world's greenhouse gasses. 

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Friday, 9 September 2022

The art of the Marra Wonga Rockshelter, Queensland.

The Marra Wonga Rockshelter is a sandstone escarpment on the Turraburra Station in Jericho Shire, Queensland, Australia, roughly 890 km to the northwest of Brisbane. The site is covered with an extensive network of art, with about 15 000 petroglyphs (rock carvings), and 111 stencil paintings over an area of about 160 m. The area is located on traditional Iningai land, and an Aboriginal-led tourism destination, with the local community playing an active role in research at the site.

In a paper published in the journal Australian Archaeology on 24 June 2022, Paul Taçon of the Place, Evolution and Rock Art Heritage UnitGriffith Centre for Social and Cultural Research, and Australian ResearchCentre for Human Evolution, at Griffith University, Suzanne Thompson of the Yambangku Aboriginal Cultural Heritage and Tourism Development Aboriginal Corporation, Kate Greenwood, also of the Place, Evolution and Rock Art Heritage Unit, and Griffith Centre for Social and Cultural Research at Griffith University, and the Greenwood ConsultancyAndrea Jalandoni, again of the Place, Evolution and Rock Art Heritage Unit, Griffith Centre for Social and Cultural Research, and Australian Research Centre for Human Evolution, at Griffith University, Michael Williams of GBA Consulting Engineers, and Maria Kottermair of the School of Earth and Environmental Sciences at the University of Queensland, discuss the Marra Wonga artwork and its significance.

The location of Turraburra and neighbouring Grey Rock. Maria Kottermair in Taçon et al. (2022).

The site is located in an area of desert uplands, with loamy, sandy plains and plateaus, Cainozoic duricrusts, and sandstone ridges. The area has sandy red and yellow soils, with some clay and siliceous sands, with a vegetation dominated by Eucalypt trees with an understory of Spinifex. Rainfall occurs mostly in the summer months, peaking during cyclones. The area immediately surrounding the rockshelter is an open woodland of Lancewood, Wattle, Mulga and Ironbark.

The first non-indigenous record of the Iningai People was made by the Scottish explorer Thomas Mitchell, who visited the area in 1846, noting the people were a 'very numerous tribe' constructing lean-to huts with roofs of bark tiles, as well as large, permanent huts connected by well beaten paths. For the most part, Mitchell tried to avoid contact with the local peoples of the areas he was mapping, but recalled encountering a large group of Iningai digging for mussels in a lake, who shouted at him angrily.

The first farming station in the region was established by Robert Christison (another Scott) in the 1860s, at Lammermoor, about 200 km to the northwest of Turraburra. Christison appears to have enjoyed better relations with the Daleburra/Iningai people of the region, employing many and writing extensively about their language and culture.

The settlement at Grey Rock dates from 1877, when the Greyrock Hotel was opened there, and Turraburra Station was first granted as a farming concession to George Porter under the name 'Charlie's Creek No. 5'. Porter's son, also George, again wrote about the Aboriginal people of the area, but this was a less happy story, recording massacres and forced relocations to mission stations. By 1902 there were only 37 Iningai  adults and three children remaining who were not living on stations, most at a camp at Lake Dolly. 

Turraburra passed through 17 different owners between 1882 and 2019, when it was acquired by the Indigenous Land and Sea Corporation and leased to the Yambangku Aboriginal Cultural Heritage and Tourism Development Aboriginal Corporation, during which time it's name was changed four times. The site is now being developed as a heritage and cultural tourism centre.

The oldest archaeological evidence for Human settlement in the highlands of central Queensland is at Kenniff Cave, a site dated to about 19 000 years before the present. Rock art in the area has been divided into three phases, with the oldest, identified as Central Queensland Phase 1, dated to more than 5000 years ago, and comprising pecked engravings into hard rock surfaces, forming complex patterns. Rock art of the Central Queensland Phase 2 is dated to between 5000 and 36 years ago, and includes pecked and abraded engravings, as well as red paintings, including stencils. Central Queensland Phase 3 dates from between 140 and 36 years ago, and shows an increased use of white paint, combined with the appearance of Lizard, Tortoise, and grid motifs. 

Iningai Country is host to a wide range of Aboriginal cultural herritage sites, including rock art sites as well as native wells, artefact scatters, stone arrangements, scarred and carved trees, a midden, contact sites, quarries, hearths, ovens and story places. There are eight registered cultural heritage sites within 40 km of Turraburra, divided into seventeen components, eight of which are rock art. 

The Marra Wonga site is first known to have been photographed in 1958, with those photographs being used to illustrate an article about the site by Fred McCarthy, an archaeologist at the Australian Museum, although McCarthy never visited the site himself. The first visit to the site by an archaeologist was made by Robert Neal of the University of Queensland in 1987, who noted that the site had become a local tourist attraction, albeit without any organised tours of the site being run.

Marra Wonga was formally opened as a tourist attraction in 1996 by the Dyer family, who owned the site at the time, with tours being run by one Tom Lochie, who later installed toilets and a picnic area close to the site. The first moves to have the location designated a protected site stem from this time. Lochie continued to run tours to the site until 2017; he passed away in January 2018.

Taçon et al. visited the Marra Wonga site in September 2020 and June/July 2021. They photographed the site extensively, as well as taking notes and making accurate location measurements with a GPS unit. Other sites in the immediate locality were recorded, including scatters of stone tools and native wells.

The central portion of Marra Wonga with an extensive wall of petroglyphs and stencils. Andrea Jalandoni in Taçon et al. (2022).

The site comprises an 160 m long, east-facing rockshelter, with art panels across the back wall to a height of 3 m as well as part of the floor. At the southern end of the site, the artwork starts with a row of 13 Birds-track peteroglyphs, overlain by at least eight Macropod (Kangaroo or Wallaby) tracks, then a small, stencil of a child's hand. Two metres further to the north are a pair of larger Macropod track petroglyphs, followed by an anthromorphic figure, after which the wall becomes covered with a much denser collection of art, some of it spreading onto the ceiling.

The actual number of petroglyphs at the site, but it is calculated that there are at least 15 000, based upon the decorated section of the wall being 160 m long, and on average 1.8 m high, with at least 50 petroglyphs per square metre. Petroglyphs are also present on nearby boulders, as well as parts of the ceiling and floor of the rockshelter.

The wall is covered with both natural and drilled holes, with some of the drilled holes cut in lines. Many of the peck-holes overcut designs pounded into the rock. Bird and Animal track designs are very common, with the Macropod tracks being the most common Animal tracks. A smaller number of Possum-like tracks are present, as well as one set of Dingo-tracks.

A portion of Marra Wonga with hundreds of petroglyphs including lots of macropod tracks. Paul Taçon in Taçon et al. (2022).

The site's single anthromorphic figure, towards the southern end of the wall, is 94.3 cm high and carved onto a projection from the wall. This figure is depicted with its arms bent at the elbow and five-fingured hands hanging down. The legs are spread wide, with the feet pointing outwards, and lacking toes. Between the legs is a long penis.

A photograph (A) and digitally manipulated image (B) of the Marra Wonga anthropomorph, enhanced using 3D modelling and Topographic Position Index. The anthropomorph (at the southern end of the site) is interpreted by Aboriginal community members as Ancestral Being Wattanuri. Paul Taçon in Taçon et al. (2022).

A large Snake, 2.28 m long and 28.8 cm high, with one end disappearing into a hole, is depicted on the wall a few metres to the north of the anthropomorph. The outline of the Snake has been marked out with lines of drilled holes, and is bulbous in the middle, tapering towards each end. This figure has been crosscut by numerous other petroglyphs, mostly Bird tracks, but also some paired boomerangs.

Engraved snake-like design on the wall between the anthropomorph and the cluster of engraved feet. Paul Taçon in Taçon et al. (2022).

There are a few engraved feet on the walls and a nearby boulder, although these are far more common on the remains of a sandstone platform abutting the wall. This area has 19 foorprints, including two large, six-toed footprints heal-to-heal at the bottom of the wall. the other feet on the platform have four, six, or eleven toes. At the northern end of the platform are a set of Bird tracks, two arcs and an abraded edge.

Case-hardened floor surface with 19 engraved human-like feet with varying numbers of toes, along with other designs. Paul Taçon in Taçon et al. (2022).

At the northern end of the site is a section of wall and a boulder with five Human feet, one six-toed and one four-toed, and a set of Dingo tracks, the only such set at the site.

A pair of large six-toed human-like engraved feet positioned heel to heel on a case-hardened floor area with 17 other engraved feet with varying numbers of toes. Paul Taçon in Taçon et al. (2022).

High  on the wall to the north of the platform of feet is a distinctive phallus, 24.6 cm high and 16.5 cm wide, with a red ochre outline. To the right of, and slightly below this, are a pair of stencilled hands, one red and one purple. Seven small boomerangs, depicted as if in flight, lead from the phallus to a series of seven star petroglyphs to the right of it.

Engraving of a Dingo paw print. Paul Taçon in Taçon et al. (2022).

The seven stars are formed by pits surrounded by radiating lines. They form three rows, with three stars in the top row, and two in each of the two rows beneath this. The three largest stars are those at either end of the top row, and the left star in the bottom row, the smallest star is the right star in the middle row. These stars are surrounded by Macropod and Bird tracks, a Possum hand, two feet, a vertical row of six pits, and some other less clear designs.

Engraved penis and boomerangs to the immediate left of the seven star-like designs interpreted as the Seven Sisters. The penis, outlined in red ochre, is interpreted by community Elders as referring to Wattanuri. Paul Taçon in Taçon et al. (2022).

An eighth star at the northern end of the rock shelter was discovered during fieldwork in September 2020. Unlike the other stars, which were clearly intended to be seen from a distance, it is in a hidden corner of the site, pointing towards the northwest rather than the east.

The seven star-like design cluster enhanced with DStretch and with star design locations indicated with numbers. Paul Taçon in Taçon et al. (2022).

To the north of the stars is another Snake, which extends for another 11.22 m, with its head facing away from the stars. This Snake is made up of two long lines with linear patterns between them, and is thickest at its middle section. 

The eighth star-like design at Marra Wonga near the northern end of the rock art panel just above the floor. It has been interpreted as a Seven Sister representation on Earth. Paul Taçon in Taçon et al. (2022).

Hand stencils are among the most common rock paintings at Marra Wonga, with 100 counted to date, including five interpreted as children due to their small sizes. The majority of these are red, although 22% are purple, 10% white, and 9% yellow. The majority (74%) of the hand stencils are of the left hand, although with the yellow stencils this trend is reversed, with five of the nine yellow stencils being of right hands. The oldest stencils appear to be the purple ones, which are always overlain by the other colours where they intersect, these are followed by red stencils, then yellow, then the white stencils, which always overlay any other colour. 

Suzanne Thompson in front of the engraved snake-like design, interpreted as a ‘Rainbow Serpent’ depiction (with black line showing its position). Thompson is explaining the significance of the rock art. Paul Taçon in Taçon et al. (2022). 

Object stencils are also common, and include boomerangs, digging sticks, and a purple ring which might be a ring pad used by women to carry heavy objects on their heads. No other site close to Marra Wonga has any object stencils.

Two red boomerang stencils and a red fist stencil on the ceiling of a low wall concavity. Paul Taçon in Taçon et al. (2022). 

Two long boomerang stencils within a concavity on the wall's surface form a clear pair, something not known at any other site in the vicinity. To the right of this is a fist stencil. Further to the right of this are several red hand stencils, then a digging stick stencil within another concavity, with a yellow boomerang stencil beneath it. Digging stick stencils are extremely rare across Australia, although a partial ceiling panel close to the digging stick stencil, shows parts of another five digging sticks, with more potentially having been lost by the rock crumbling away. Close to this is the stencil interpreted as a ring pad. 

Rare red stencil of a digging stick, the only one at Marra Wonga. Paul Taçon in Taçon et al. (2022). 

Excluding stencils, Marra Wonga has only a single painting, the track of an Emu, realised in short red lines, and running across a wall panel, with one footprint on a boulder which also has petroglyphs. Many of the natural features of the site, such as cavities, holes, and depressions, have been worked into the art, and used to help place or orient the petroglyphs and stencils.

The site is also home to some modern graffiti, with inscriptions reading 'N. MELVILLE', 'TMcK', 'H. HALAM', and 'PEARL'. The oldest graffiti that can be dated was left by T. Smith in 1913.

A small scattering of stone tools has also been found close to Marra Wonga, although none actually next to the art site; it is possible that tools left closer have been removed, as the site has been visited by tourists in an unregulated way since the late 1800s. The closest cluster of tools to the site is 120 m to the south, possibly suggesting people stating close to the rockshelter, but only directly approaching to perform some ceremony.

Twenty three further rock art sites have been found in the vicinity of Marra Wonga, although the artworks found at these are both smaller and less numerous. A quarry site from which pigments have been extracted was also located nearby. One site, a few hundred metres to the south of Marra Wonga, has an adult hand stencil executed in a black pigment (not seen at Marra Wonga). Another nearby site has Bird tracks and stars scattered over a wall 15 m long. At Grey Rock station, 11 km to the west, a wall has a series of adult and child hand and foot stencils executed in red and yellow.

Gray Rock Historical Reserve, the site of the Greyrock Hotel, has a wall with four anthromorphic figures, two Human feet, and what appears to be a Possum hand, as well as a large amount of graffiti. The figures are executed in a similar style to the one at Marra Wonga, which, given the rarity of Human figures in the rock art of the Queensland Highlands, probably implies that they were made by the same group or even individual artist, and may indicate a connection between the two sites.

The art at Marra Wonga has never been dated, and was probably made over a long period of time. Some of the art is overlain by fossil Wasp's nests, giving the potential for a minimum age to be established. Some of the pecked designs are likely to be over 5000 years old, with others along with the other petroglyphs and the red and purple stencils are likely to be between 5000 and 36 years old. Yellow and white stencils are generally considered to be much younger, and since the yellow stencils at Marra Wonga overlay all other art, it is reasonable to assume that they are less than 140 years old.

The art at Marra Wonga can be divided into 10 clusters, which appear to be ordered from south to north, although they were likely to have been made at different times. The modern Aboriginal community of the area interpret these panels as telling a Seven Sisters (Kungkarrangkalpa ) Dreaming Story.

The anthropomorphic figure at Marra Wonga is interpreted as being a representation of Wattanuri, an Ancestral Being known by a variety of names across Australia, and associated with the constellation of Orion and the Morning Star. The anthropomorphic figures at Grey Rock are also interpreted as Wattanuri. Wattanuri is a shape-shifting Clever Man who pursues the Seven Sisters in most variants of the story.

The Snake figure is generally accepted as Wattanuri shapeshifted into the form of a Snake, although sometimes another mythical or extinct Animal. The footprints are also those of Wattanuri, who must regularly check the number of toes he has in order to see if his magic is going out of control. The phallus is another representation of Wattanuri, while the boomerangs are carried by him and thrown at the Seven Sisters. 

The seven stars are representations of the Seven Sisters, who are linked to the constellation of the Pleiades. Most variants of the story tell that early in the history of the world the Seven Sisters came down to Earth, where they were chased by an old (and possibly evil) man with a large penis who wanted to make them his wives. All of the stories tell of different incidents as the Seven Sisters try to get away and the Man pursues them. These incidents happened at distinctive locations, such as hills, waterholes, and sometimes rock art sites, and each story has a moral lesson. In some variants the Old Man captures the Oldest Sister and rapes her, requiring the other Sisters to heal her, and includes information about healing plants. The long Snake is a representation of the Rainbow Serpent, another manifestation of Wattanuri.

One version of the story holds that the Seven Sisters travelled westward to a sacred place called Kuru Ala. Here Wattanuri captures and hurts the oldest sister, and the Sisters gather healing plants and food. While they do this Wattanuri turns his phallus into a Carpet Snake, and sends it down through the rocks to spy on them. The Sisters capture the Snake and throw it away, causing it to shimmer like a rainbow as it flies through the air. The Sisters then capture, cook, and eat the Snake, before realising that it is part of Wattanuri, The Snake makes them ill, they vomit and return to the sky.

The boomerangs at Marra Wonga are interpreted as signs of a male presence, and associated with Warranuri, while the digging sticks and ring pad are feminine objects associated with the Seven Sisters. The digging sticks may, in stories, be used to carry fire, capture the Sisters, beat of Man attacking the Sisters, or dig for food and medicinal Plants. 

The Dingo track may also relate to the Severn Sisters story, as in variants of the story a Dingo either helps to protect the Sisters or is used to hunt them. The single star on its own on the ground may represent a Sister on Earth hiding from Wattanuri, with the nearby tracks representing a Dingo protecting her. 

Rock art associated with Ancestral Beings is found across Australia, with some sites even reputed to have been created by them. This rock art often takes advantage of natural features of the sites, such as cavities, holes, cracks, and changes in orientation, as well as incorporating adjacent rocks, boulders and natural rock platforms, to emphasise and orient the artwork.

The Marra Wonga site has been recognised as being archaeologically important since at least 1960, but has not received the protection of sites such as The Palace in Central Western Queensland, despite its rock art being at least equally impressive and very different. As well as being exceptional from an archaeological perspective, the art is still very important to the local Aboriginal community.

There are at least 83 sites across Australia associated with the story of the Seven Sisters, although Marra Wonga is one of only four with artwork, and these are widely scattered across the continent. Besides Marra Wonga, there is artwork associated with the Seven Sisters to the north of Karlamilyi in Western Australia,  in South Australia near the Northern Territory border, about 100 kilometres south of Uluru, and at a site south of Lake Eyre, also in South Australia.

Preserving such sites both protects the traditional religion and culture of the Aboriginal people, it created economic opportunities in the form of tourism which remote communities can take advantage of.

The story of the Seven Sisters varies across Australia, but always contains morals, and important information about the local environment. The Sisters are always pursued by a shape-shifting Clever Man, who can turn into a variety of Animals and other objects. The need of this individual to test his footprint and count his toes is found in many of these stories, as is the Sisters being made ill by his magic and needing to return to the sky.

Petroglyphs depicting Human feet with varying numbers of toes are surprisingly widespread, with a recent global survey of sites with petroglyphs depicting feet with six toes uncovering 21 in Australia, ten in the United States of America, four in Argentina, three in Chile, two in Namibia and New Zealand, and one each in Angola, Botswana, Egypt, Rapa Nui (Easter Island), South Africa and the United Kingdom. Of the 21 sites in Australia, nine are in Queensland (and eight of those in the Central Highlands), three are found in the Northern Territory, three more in South Australia, and  two each in New South Wales, Tasmania and Western Australia. Another 64 sites in Australia and 209 globally have feet with different numbers of toes. Of these sites, 44 are in Sweden, followed by 26 in the United States of America and 18 in Norway. Twenty four of the Australian sites are in Queensland, 18 in New South Wales, 13 in South Australia, four in both the Northern Territory and Western Australia and one in Tasmania.

In Queensland six-toed foot petroglyphs are particularly common in Bidjara Country to the southeast of Turraburra. Six toes and six finegers are fairly common among the Bidjara people. Six-toed petroglyphs (including the largest foot petroglyphs at Marra Wonga) are typically much larger than Human feet, and are considered by the Bidjara people to represent one of their Dreaming ancestors. 

Rainbow Serpents are also extremely common across Australia, with the oldest thought to be over 6000 years old. However, almost all of these are painted, rather than engraved like the one at Marra Wonga. As with other important ancestral figures, Rainbow Serpents are sometimes credited with placing their own images onto the rocks, without the need for a Human artist.

The size, large amount of artwork, and presence of a number of rare symbols and themes, at Marra Wonga may suggest that it was once an aggregation site, i.e. a site at which different bands of hunter-gatherers came together to meet at seasonal events. Marra Wonga is the largest rock-art site in Queensland, with over 15 000 (more pertoglyphs on a wall than any other site in Australia) and 111 stencils. It is also the second most diverse rock-art assemblage in Queensland, after The Palace. Most of the symbols at Marra Wonga are widespread, such as the hand stencils, which are found throughout Central Queensland, but others are rare or even unique, such as the cluster of stars, the phallus, the digging sticks, or the 11 m long Snake. However, other features common at Australian rock-art sites, such as naturalistic depictions of Animals and painted grids, are absent.

The Marra Wonga site has clearly been worked upon by rock-artists for a very long time. Given the length of the site's use, it is possible that the both the people using it and their interpretation of its meaning has changed over this time. The site is home to a diverse range of images, many of which are unique or very rare. These images are used today, and presumably been used in the past, to assist with the telling of important tales about the origin of the people and their culture, and their relationship with the world around them. The diversity of the images at the site may indicate that it was used as an aggregation site, with peoples from across a wide area meeting up their and bringing elements of their own culture to the site.

Taçon et al. consider that the unique nature and cultural importance of Marra Wonga make it worthy of special protection, and will concentrate future research both on the conservation of the site and the better documenting and understanding of its many features.

See also...




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