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What are stromatolites?

User Moogal
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2 Answers

7 votes

A calcareous mound built up of layers of lime-secreting cyanobacteria and trapped sediment, found in Precambrian rocks as the earliest known fossils, and still being formed in lagoons in Australasia.

User Aceminer
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5 votes

Answer:

layered mounds of calcium carbonate that were deposited by algae during the Precambrian time

Step-by-step explanation:

User Mike Cluck
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