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).
Imprint fossils are also known as impression fossils. They do not contain any carbon material. Imprint fossils include coprolites (fossilized feces), footprints, plants or tracks.(Jultud/iStock/Getty Images).mprint fossils are also known as impression fossils. They do not contain any carbon material. Imprint fossils include coprolites (fossilized feces), footprints, plants or tracks. (Jultud/iStock/Getty Images).