By: Tracy V. When paleontologist Mary Schweitzer found soft tissue in a Tyrannosaurus rex fossil , her discovery raised an obvious question -- how the tissue could have survived so long? The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains , decomposes. Only hard parts, like bones and teeth, can become fossils.
Dating Fossils in the Rocks
Methods of dating fossils and artifacts | Applied Biomimetic
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What are the 3 types of fossils?
In order to find the general age of layers of sedimentary rocks, what process would scientists use? A The Law of Superposition is an explanation relating to the sequence of disturbed rock layers. B The Law of Superposition is an observable fact relating to the sequence of undisturbed rock layers. C The Law of Superposition is a study of past events preserved in disturbed rock layers and their exceptions. D The Law of Superposition is a theory that may be replaced by an improved theory if new discoveries are made relating to the sequence of undisturbed rock layers.
The index fossils help scientists study rock ages, in what way do index fossils help determine rock ages. Suppose that a paleontologist finds a type of fossil in one rock layer but in none the surrounding layers. Now suppose that a different paleontologist, working 3, km away finds the exact same fossil in one rock layer but in not of the surrounding layers. What would the paleontologist most likely conclude.