Thrombolite

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Further information: Microbial mat
Modern thrombolites in Lake Clifton, Western Australia
Jurassic thrombolite formed around a tree trunk; Purbeck Formation, Isle of Portland, Dorset, England.

Thrombolites are clotted accretionary structures formed in shallow water by the trapping, binding, and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria. Stromatolites are similar but consist of layered accretions.

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