Index Fossil Short Meaning. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Every fossil tells us something about the age of the rock it's found in, and index fossils are the ones that tell us the most.
An ideal index fossil lived during a short period of time, was geographically and environmentally widespread, and is easy to identify. Chapter 17 the history of life modeling index fossils introduction a fossil is the remains or evidence of an ancient living thing. A fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found familiarity information:
Women whose index finger was short compared to their ring finger were more likely to have what was regarded as a traditionally male job, the national research university in russia found.
Fossils of animals, plants, or protists occur in sedimentary rock. Index fossil in american english. Molds and casts are other types of body fossils. Fossil, remnant, impression, or trace of an animal or plant of a past geologic age that has been preserved in earth’s crust.