Sol definition, the syllable used for the fifth tone of a diatonic scale. See more.
Examples of index fossils. Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
What is not a use for fossils found in sedimentary rocks? Fossils found in sedimentary rocks cannot be used to date the rocks dinosaur fossils are found in. This is because they don't contain unstable radioactive isotopes.