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Fossilized stromatolites exhibit a variety of forms and structures, or morphologies, including conical, stratiform, domal, columnar, [13] and branching types. [14] Stromatolites occur widely in the fossil record of the Precambrian but are rare today. [15]
A bioherm is a landform of organic sedimentary rock enclosed or surrounded by rock of different origin. [2] A biostrome is a distinctly bedded or broadly lenticular sedimentary rock landform. [ 3 ] Krumbein additionally used these terms to distinguish different shapes of stromatolites : "Distinctly bedded, widely extensive, blanketlike build ...
The stromatolites found today are almost all carbonate rocks (made of limestone), but these structures are mostly composed of the minerals gypsum and halite (rock salt), Hynek said.
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Stromatolites, bioherms (domes or columns similar internally to stromatolites) and biostromes (distinct sheets of sediment) are among such microbe-influenced build-ups. [3] Other types of microbial mat have created wrinkled "elephant skin" textures in marine sediments, although it was many years before these textures were recognized as trace ...
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Stromatolites were much more abundant in Precambrian times. While older, Archean fossil remains are presumed to be colonies of cyanobacteria, younger (that is, Proterozoic) fossils may be primordial forms of the eukaryote chlorophytes (that is, green algae). One genus of stromatolite very common in the geologic record is Collenia. The earliest ...
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