Trilobites are found in which geologic setting?

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Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

Trilobites are found in which geologic setting?

Explanation:
Trilobites first appear in the fossil record in Cambrian rocks and are iconic of Cambrian oceans. They were early, hard-shelled marine arthropods that thrived in shallow sea environments, so Cambrian marine deposits are where their fossils are most commonly found. While they do appear later in some groups into the Ordovician, their defining and earliest-rich context is Cambrian. They are not typical in Cretaceous rocks, since trilobites had largely disappeared by that time (extinct by the end of the Permian). So Cambrian marine deposits are the setting that best fits trilobites.

Trilobites first appear in the fossil record in Cambrian rocks and are iconic of Cambrian oceans. They were early, hard-shelled marine arthropods that thrived in shallow sea environments, so Cambrian marine deposits are where their fossils are most commonly found. While they do appear later in some groups into the Ordovician, their defining and earliest-rich context is Cambrian. They are not typical in Cretaceous rocks, since trilobites had largely disappeared by that time (extinct by the end of the Permian). So Cambrian marine deposits are the setting that best fits trilobites.

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