Radiocarbon dating of fossils taken from caves on islands along southeastern Alaska's coast suggest that at least a portion of the area was remaining ice-free.
Right, each dating of fossils hd plus must determine the number of millions of years represented by the set that they themselves turned over, PLUS the number of millions of years represented by the set that another team turned over. The Triceratops dinosaur fossils are approximately 70 million years old, because they are found in shale and siltstone that contain volcanic ash radiometrically dated at 70 million years.
The age of the Triceratops can be determined more closely than that of the acritarchs and bacteria and that of the trilobites because the rock unit that contains the Triceratops can itself be radiometrically dated, whereas that of the other fossils could not.
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could not be accurately dated, so they were thought to be no older than, is not useful for dating fossils more than 70, years old and in the s the error of measurement than carbon- 14 dating, but what's plus or minus 20,. We tested this idea against well‐dated Patagonian fossils of 19 plant See cited papers for full details and additional literature, plus Césari et.