stromatolite

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Stromatolitler
Английский Язык - Английский Язык
A laminated, rock-like structure built over geologic time by microorganisms such as cyanobacteria
A laminated mounded structure composed of limestone built by cyano-bacteria Stromatolites form today in warm shallow tropical seas They appear in the early Precambrian
a layered, fossilized deposit, mainly of limestone, formed by photosynthesizing colonial cyanobacteria and other microbes They are the oldest known fossils, dating back more than 3 billion years Stromatolites are prokaryotes that thrived in warm aquatic environments and built reefs much the same way as coral does today They were common in Precambrian time (i e , more than 540 million years ago) Although stromatolites continue to form in certain areas of the world today, they grow in greatest abundance in Shark Bay in western Australia
A calcareous deposit, secreted by calcareous algae in the form of laminated domes and columns Occurs in many cenotes (qv)
A rock-like structure built by cyanobacteria
Dome-like microbial mat communities consisting of filamentous photosynthetic bacteria and occluded sediments (often calcareous or siliceous) They usually have a laminar structure Many are fossilized, but some modern forms occur (See 423)
Layered deposit, mainly of limestone, formed by the growth of blue-green algae (see cyanobacteria). These structures are usually characterized by thin, alternating light and dark layers that may be flat, hummocky, or dome-shaped. Stromatolites were common in Precambrian time (more than 543 million years ago). Some of the first forms of life on Earth are recorded in stromatolites in rocks 3.5 billion years old. Stromatolites continue to form in certain areas today, most abundantly in Shark Bay in western Australia