Most breaks on fossilized bones are "the result of geological processes well after death," says paleoanthropologist Tim White of the University of California, Berkeley, such as movement in water or soil, tectonic forces, pressure of overlying sediments, and weathering or trampling of fossils as they erode out of sandstone.
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North Carolina State University paleontologist Lindsay Zanno discovered the Siats bones eroding out of a hillside in Utah in 2008.
Brick walls and foundations from the gas chambers remain, as do massive amounts of human bone, including fragments now eroding out on the forested ground surface.
"Because you just walk them up 30 or 40 feet in elevation above today's sea level and show them a fossil beach, with shells the size of a fist eroding out, and they can look at it with their own eyes and say, 'Wow, you didn't just make that up.' " Skeptics who play down the importance of global warming like to note that these past changes occurred with no human intervention.
The strangely shaped rocks are eroded out of entrada sandstone, a reddish rock that dates to the time of the dinosaurs and underlies much of south-east Utah.
In February 2009, at a place in the central Afar region known as Burtele, a member of Dr. Haile-Selassie's team, Stephanie Melillo, spotted the first bone fragment eroding out of sandstone.
Paleontologists also agreed that the skull of an extinct giraffe, possibly Samotherium, often found eroding out of rock outcrops in the region, may have been the artist's model and perhaps even the inspiration for the original myth.
The thought is that, many aeons ago, they eroded out of their (now vanished) original rocks, and were deposited somewhere else by a river or stream, where they rested for billennia, until disturbed by geologists.
"If it erodes out of the oesophagus and it goes into the airway then it creates an opening between the oesophagus and the airway so every time the child eats or drinks, fluid and food floods into the lungs, damaging the lungs and producing life-threatening chest infections".
The recorded lithic artefacts, which eroded out of the sediments, can be attributed to the Middle Stone Age (MSA).
