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Author Question: _____ reefs were dominated by crinoids, blastoids, lacy bryozoans, brachiopods, and calcareous ... (Read 58 times)

dejastew

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on: Jul 13, 2018
_____ reefs were dominated by crinoids, blastoids, lacy bryozoans, brachiopods, and calcareous algae.
 A)Carboniferous
 B)Cambrian
 C)Permian
 D)Devonian
 E)Ordovician

Question 2

What is a glacial erratic, and how can scientists use this feature to learn about a glacier?


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mohan

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Reply #1 on: Jul 13, 2018
Answer to Question 1

A

Answer to Question 2

A glacial erratic is a rock that has been eroded by a glacier and deposited some distance from its source. Erratics are compositionally dissimilar to the bedrock in the area of deposition.

By determining the likely source for an erratic, scientists can estimate the extent of historical glaciation.


dejastew

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Reply #2 on: Jul 13, 2018
Thank you


mohan

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Reply #3 on: Jul 13, 2018
No problemo


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