What are stromatolites? A) fossil Nautilus shells formed by deposits of hydroxyapatite B) FeO in banded iron formations C) bulbous masses of layered CaCO₃ accreted by microbial mats D) accumulations of fossil trilobites E) fossils from the Hadean eon

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Stromatolites are bulbous masses of layered CaCO₃ accreted by microbial mats. They are often found in shallow marine environments and represent some of the earliest evidence of life on Earth.

What Are Stromatolites