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What is the remains of organisms preserved by geologic process?
The remains are called fossils.
Fossils in newer layers of the earth tend to resemble current?
organisms
How paleontologists use trilobites fossils as index fossils for various geologic time periods?
Trilobites were rapidly evolving and widespread marine organisms that spanned a number of geologic time periods. Certain types of trilobites only appeared in specific segments of geologic time; therefore, when one of these trilobites is found, you can be certain that the rock layer it is found in is of a certain geologic age.
What are index fossils useful for?
Because organisms that became index fossils lived only during specific intervals of geologic time, geologists can estimate the ages of rock layers based on the particular index fossils they contain.
What is the relative age of fossils found at the top layer of rock?
They are called index fossils, fossils of organisms that were widespread, evolving quickly, and only appeared in the geologic column for a specific length of time.
When did organisms that formed index fossils?
Organisms that formed index fossils existed during specific time periods in Earth's history. These organisms lived in abundance, had a widespread distribution, and have distinctive features that make them easy to identify in the fossil record. By studying these index fossils, scientists can determine the relative age of the rocks in which they are found.
Which layer is most likely to contain fossils that resemble existing species?
new layer of the fossils
How paleontologists use trilobite use fossils as index fossils for various geologic time periods?
yeah
What geologic period has fossils of the most primitive lifeforms?
cambrian
Do fossils relate to living organisms?
No. Fossils are chemicals like stone that have replaced organisms after they die.
How does the biogeography of fossils support evolutionary?
Modern plants and animals resemble fossils found in the same area.
For which segment of the Earth's geologic history are fossils rarely found?
precambrian
