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2 Which fossil organisms could possibly be used as index fossils? The following question may help clarify this point.

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2 How do you know that "X" is older than "M"? This relative time scale divides the vast amount of earth history into various sections based on geological events sea encroachments, mountain-building, and depositional events , and notable biological events appearance, relative abundance, or extinction of certain life forms.

com What is a relative clause? The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place.

The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer.

By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata.

It is recommended that students complete Procedure and answer the associated Interpretation Questions correctly before proceeding to.

This quick assessment allows me to verify student understanding of the concept of superposition.

Older relatives get on easier with people and have more success as a result.

Technically, however, given only this set of strata, one cannot say that the shark's tooth and ichthyosaur could be used as index fossils because we do not know if they continue in younger rock layers above this set of strata.