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World's Oldest Axe Found in Australia

Australian Archaeology. Dating of the piece of polished axe suggests it was created shortly after the first humans arrived in Australia. No bigger than a thumbnail, the Stone Age axe fragment was found in the remote Kimberley region of Western Australia. Dated to between 45,000 and 49,000 years ago, the axe is at least ten millenia older than previous discoveries of ground-edge axes. “This is the earliest evidence of hafted axes in the world. Nowhere else in the world do you get axes at this date,” said Professor Sue O’Connor, an archaeologist from the Australian National University who worked on the project. Hafted axes are those axes which have a handle attached. “In Japan such axes appear about 35,000 years ago. But in most countries in the world they arrive with agriculture after 10,000 years ago.” O’Connor explained, in a ANU press release. The remarkable discovery points to the innovation of Australia’s earliest human inhabitants, showing they were capable of a greater technological sophistication than is often believed. Professor Peter Hiscock from the University of Sydney was responsible for analysing the fragments unearthed in Western Australia. “Since there are no known axes in Southeast Asia during the Ice Age, this discovery shows us that when humans arrived in Australia they began to experiment with new technologies, inventing ways to exploit the resources they encountered in the new Australian landscape,” Hiscock explained, in a press release from the University of Sydney. Analyses of the fragment have revealed it came from a hafted axe made from basalt; the fine grained rock shaped and polished by grinding it against a softer rock such as sandstone. The axe could have been useful for any number of tasks, from chopping down trees to stripping the bark off wood, even as a tool for shaping wood into spears. The fragment was initially excavated by O’Connor in the 1990s, among a host of other artefacts from Carpenter’s Gap, a large rock shelter known to be one of the first sites occupied by modern humans. In 2014, further study was carried out on the objects, including food scraps, tools and artwork, that had been extracted two decades earlier. It was then that Hiscock noticed the fragment of polished axe. Surprisingly, it seems that the axes developed in the region surrounding Carpenter’s Gap did not migrate with humans through the rest of Australia. “Axes were only made in the tropical north. These differences between northern Australia, where axes were always used, and southern Australia, where they were not, originated around the time of colonisation and persisted until the last few thousand years when axes began to be made in most southern parts of mainland Australia,” Prof. Hiscock explained. The dating of the axe fragment has shed fascinating new light on the development of Stone Age hunter-gatherer societies, and the chronology and geography of the development of certain tools. “Polished stone axes were crucial tools in hunter-gatherer societies and were once the defining characteristic of the Neolithic phase of human life. But when were axes invented? This question has been pursued for decades, since archaeologists discovered that in Australia axes were older than in many other places. Now we have a discovery that appears to answer the question,” said Hiscock. Image courtesy of ANU ]]>

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Bubbles Show Early Earth's Atmosphere Was Half The Weight

Geosciences. “It’s going to take us a while to digest all the possible consequences.” A lighter atmosphere could have affected the Earth in a number of ways, changing climatic conditions, wind levels, even the boiling points of liquids. Other geological evidence has shown that water was present on earth at this time, so the atmosphere must have contained heat trapping greenhouse gases, such as carbon dioxide and methane. Scientists have used air bubbles before, as a means to measure the elevation of lavas millions of years old – the trapped air providing insights into the height at which the lava solidified. The team behind the latest study, led by Sanjoy Som, a post doctoral student from the University of Washington, flipped this process; taking a site where lava had indisputably formed at sea level and using it to determine the air pressure billions of years ago. “For the longest time, people have been thinking the atmospheric pressure might have been higher back then, because the sun was fainter,” said Som, in a press release from the University of Washington, “Our result is the opposite of what we were expecting.” The key to the researchers’ study is the fact that streams of molten rock quickly cool from the top and bottom. Bubbles trapped at the bottom are therefore smaller than those at the top, the difference in size reflecting the air pressure pressing down on the lava as it cooled. Study co-author Tim Blake from the University of Western Australia discovered the site used in the research: basalt lava exposed by the Beasley River, in Australia. By drilling into the overlying lava flows, the team were able to examine the size of the bubbles. Rough estimates taken at the time suggested the atmosphere 2.7 billion years ago was lighter than expected, and subsequent, thorough x-ray examinations of several different lava flows confirmed that the atmospheric pressure was less than half of what it is today. The next step for the researchers is to search for other rocks that confirm their findings, hopefully allowing them to gain a better understanding of how atmospheric pressure might have changed through time. For more information: www.nature.com Image courtesy of Sanjoy Som/University of Washington]]>

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New, Ornate Tattoos Discovered on Egyptian Mummy

Nature, Austin recounted how she had found the tattoos on the mummy while examining sets of remains for the French Institute of Oriental Archaeology. The Institute researches finds in Deir el-Medina in Egypt, a village that once housed ancient stonecutters and masons that were responsible for excavating tombs in the Valley of the Kings, which is located nearby. Austin first noticed markings on the neck of one set of remains – an armless, headless torso discovered in Deir el-Medina that had died sometime between 1300 BCE and 1070 BCE; first believing the marks were body paint, she soon came to realize that they were in fact permanent tattoos. The scientist was familiar with how infrared imaging had been used to reveal tattoos on other mummies and decided to subject her mummy to the same techniques. As a result, Austin documented more than 30 tattoos on the body, some in areas dyed so dark by the mummification process that they would have otherwise been invisible to the naked eye. After digitally stretching the tattoo images to counter the distortion caused by the mummy’s shrunken, desiccated skin, the images became clear. The sheer number of tattoos the woman had, their location – many in places that would have been impossible to reach herself – and the fact that some tattoos had faded more than others, all seem to indicate that the woman went under the needle routinely throughout her life. Whether she was a member of a priestly class or simply someone who wanted to showcase her unflagging devotion to the gods is of course pure speculation, but the idea that these tattoos were just adornment seems to be highly unlikely. With many of the tattoos having direct religious significance – such as those of cows, which are thought to be associated with Hathor, a major ancient Egyptian deity – it seems all but certain that the woman was quite pious in life. ]]>

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Economic Crisis In the Nineteenth Century: The Panic of 1837

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Kublai Khaan’s Imperial Palace Discovered Under the Forbidden City

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Wreck of WWI-Era British Navy Vessel Surveyed by ROV

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Colonel Blood Caught Stealing Crown Jewels

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Ichnology Has a New fossil – Lepeichnus Giberti

Lepeichnus Giberti. The organism that created the burrows is unknown but believed to have been a type of swimming crustacean. Dr. Zain Belaústegui from the University of Barcelona and the article’s main author explained to Heritage Daily that what makes L. Giberti exceptional is that all stages of the fossil, from its origin to its final phase, have been recovered – a total of 9 separate and consecutive ichnogenetic phases within the fossil. A modern comparison would be if you took a series of pictures of an animal burrowing, but instead of seeing the burrowing process in a series of pictures, the stages were kept as fossils. Ichnofossils are valuable for several reasons; since they are typically preserved in situ, they provide environmental information for the time in which they were formed, they’re a record of an animal’s behavior, and often times they’re the only record of certain (soft-body) organisms which have no fossilization characteristics. The preserved state of the L. Giberti is exceptional in large part because of the sandy silt which filled the burrows after they were abandoned by their organisms and helped preserve even the most delicate details. The sandy silt also helped aid in the collection process. Approximately 90 samples have been collected, and the fact that the samples vary in size, from 1cm to 10cm wide, indicates to researchers that the animal or organism had the same burrowing behavior whether young or old. A bay, likely affected by tides, was present 6 million years ago in the area where the fossils were found. Relatively shallow and protected from storms and waves, it would have been an ideal location for large communities of organisms of this nature to gather. Other organisms, such as anemones, other crustaceans, and possibly cetaceans would have also lived in the area. At this time, scientists know of no other organism, ancient or modern, that digs a burrow with the characteristics of L. Giberti’s. Several similar traits are found in today’s upogebiid (a crustacean) which burrows on the sea floor. It’s possible the burrowing habits of the new organism are an extinct behavior of the upogebiid. The degree of fossilization and preservation of the various evolutionary stages of L. Giberti has experts proposing a new term in the field of Ichnology; ichnogeny. Ichnogeny describes the evolution and origin of a fossil or modern print, burrow or trace, found in both soft and hard substrates. The name of the new fossil – Lepeichnus Giberti – pays tribute to the town of Lepe and the memory of Dr. Jordi Maria de Gibert Atienza, a distinguished leader in Spain’s ichnology research. Image courtesy of Wikimedia Commons user: Daniel Toscano Díaz]]>

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Iron Age Well Used as Victorian-Era Rubbish Heap

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Dinosaurs Were an Important Resource for Dung Beetles

PLOS ONE, co-author Dr. Stephen Cameron with the Queensland University of Technology in Australia explained that fossilized dinosaur feces (70 and 80 million years old) supports the hypothesis the study outlines because it shows signs of tunneling that has been attributed to dung beetle feeding. The study is the first to show how the specialization of one group was related to using dinosaurs, the dominant species for 135 million years, as a resource. Of course, the flip side of this connection is that the mass extinction of dinosaurs during the Cretaceous-Paleogene period would have also impacted the dung beetle. Fortunately for the beetle, the impact of the dinosaur extinction occurred during the beetle diversification and they survived the event. The study concludes that the modern dung beetle is descended from a species which either fed on the dung of dinosaurs and other early mammals, or from a species which had already adapted to eating the dung of the Cretaceous mammals. Although the findings may challenge prior research associating mammals and the origin of dung feeding, the study also shows that the greatest rate of diversification the beetle experienced was during the Paleogene period, which is in line with the timing of major diversification of most mammals. Additional research will be needed to untangle the cause of the latest diversification and provide more detail on the dung beetle’s survival through the Cretaceous-Paleogene mass extinction. This story of flowering plants, beetles, and dinosaurs, demonstrates the relationships and complex interactions between evolving ecosystems, and the possibility of discovering what drives diversification – even for insects like the dung beetle for which very limited fossil records exist. The study was published this week, in the open-access journal PLOS ONE.]]>