Why Are Stromatolites Layered?
Stromatolites (“Layered Rocks”) Are Rocky Structures Made by Photosynthetic Cyanobacteria. the Microbes Secrete Sticky Compounds That Bind Together Sediment...
Stromatolites (“layered rocks”) are rocky structures made by photosynthetic cyanobacteria. The microbes secrete sticky compounds that bind together sediment grains, creating a mineral “microfabric” that accumulates in fine layers.
How do stromatolites form layers of organic rock?
Stromatolites are layered biochemical accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains in biofilms (specifically microbial mats), especially cyanobacteria. ... Stromatolites occur widely in the fossil record of the Precambrian, but are rare today.
What is unique about stromatolites?
Stromatolites are created by cyanobacteria, also called blue-green algae. These microscopic life forms are not really algae at all but bacteria that have the ability to carry out photosynthesis. ... These minerals form a crust over the cyanobacteria, which continue to grow around and through the crusty layer.
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