Igneous rock layers can supposedly be directly dated, so sedimentary layers sandwiched between them are interpreted to have been deposited in between the "ages" assigned to the igneous rocks.Where igneous rocks are absent, a fossil's "age" is determined by comparing the fossils of one location to those of another, and then comparing those comparisons to charts in books with age assignments provided on the pages.
Three geologists have reported what they called the first "successful" direct dating of dinosaur bone.
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The process generally used to date a fossil is circuitous and subject to differing interpretations.
It has involved tracing the related sedimentary rock layer horizontally from the place where the fossil in question was found to a place where it is underlain or overlain (or both) by igneous rock.