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These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating.Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.Co-author Dr Alex Liu, a palaeobiologist at the University of Cambridge, told IFLScience that brain tissues “are amongst the least likely tissues we would expect to ever be found in a fossilized terrestrial vertebrate.” This unfortunate dinosaur appears to have died near a bog or swamp, one containing a soup of highly acidic, oxygen depleted disgustingness.Having taken a tumble into it, its brain was essentially “pickled” by the bacteria-unfriendly mess, and its soft tissue was mineralized before it decayed away.

Every now and then, you get an impression of a footprint, or the trace outlines of a feathered arm or “wing.” Sometimes, paleontologists strike proverbial gold and find a segment of dinosaur tissue, including skin, capillaries, and – as revealed in an incredible special publication by the Geological Society of London – even a brain.

It includes geologic, chemical and molecular data to make its case.

When it comes to determining the age of stuff scientists dig out of the ground, whether fossil or artifact, “there are good dates and bad dates and ugly dates,” says paleoanthropologist John Shea of Stony Brook University.

Fossils are the preserved remains of creatures which existed long ago.

Fossils range in age from few thousands of years to hundreds of millions of years.

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