Trilobites are indicative of which geological time interval?

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Study for the ASBOG 1 Geology Exam. Use flashcards and multiple choice questions for effective preparation. Each question includes hints and detailed explanations for better understanding. Prepare confidently for your exam!

Multiple Choice

Trilobites are indicative of which geological time interval?

Explanation:
Trilobites are classic index fossils that first appear abundantly in the Cambrian and become widespread in rocks from that interval. Their rapid diversification and broad geographic distribution make Cambrian rocks identifiable by trilobite assemblages. By the time you reach the Triassic, Jurassic, or Cretaceous, trilobites are no longer present, so those intervals are not indicated by trilobites. In short, finding trilobites points to Cambrian age.

Trilobites are classic index fossils that first appear abundantly in the Cambrian and become widespread in rocks from that interval. Their rapid diversification and broad geographic distribution make Cambrian rocks identifiable by trilobite assemblages. By the time you reach the Triassic, Jurassic, or Cretaceous, trilobites are no longer present, so those intervals are not indicated by trilobites. In short, finding trilobites points to Cambrian age.

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