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.
- The formation has yielded numerous fossils of stromatolites in addition to microfossils.
- Fossilized cyanobacterial mounds are called stromatolites.
- At first sight, the Shark Bay stromatolites look like rocks lying in an orderly fashion in the intertidal zone.
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