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____ [38]
3 years ago
6

. Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

History
1 answer:
Alisiya [41]3 years ago
3 0
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.
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The cession of Louisiana was kept secret for over a year. France feared that Louisiana would become British. As a result, France sought to preempt any actions that Britain would undertake if it became known that Louisiana no longer enjoyed French protection before the Spanish were able to occupy and defend it. Great Britain officially conceded Spanish ownership of Louisiana in February 1763 in one of the series of treaties ending the French and Indian War. This gesture was a mere formality, for the territory had been in Spanish hands for almost three months.

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