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).
According to The Petrified Wood Museum, a common fossil mold includes insect wing impressions. By studying the preserved pleating on the wings, paleontologists identify the insect family. Display. Museums make plaster of Paris or fiberglass casts of fossils to preserve the original fossil for study. Paleontologists also use casts for study if the original fossil is too fragile. When the weight of the fossil makes mounting of the original impractical, copies are used for display purposes.