Stromatolite fossils ancient earth life 1 billion years 4 fossils per winner for Sale

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Stromatolite fossils ancient earth life 1 billion years 4 fossils per winner For Sale

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Stromatolite fossils ancient earth life 1 billion years 4 fossils per winner:
$13.48

Stromatolite fossils from the fossil record of thePrecambrian,Each buyer will receive 4 fossils sized approximately between 3/4 to 1 inch wide by 1/2 to 1 inch deep scooped from fossils as pictured.These fossils are great educational and hands on learning specimens and come fromNorth Africa near the Sahara desert.Stromatolitesorstromatolithsare layered mounds, columns, and sheet-like sedimentary rocks that were originally formed by the growth of layer upon layer ofcyanobacteria, a single-celled photosynthesizing microbe.Fossilized stromatolites provide records of ancientlifeon Earth.Lichen stromatolitesare a proposed mechanism of formation of some kinds of layered rock structure that are formed above water, where rock meets air, by repeated colonization of the rock byendolithiclichens.Stromatolites are layered bio-chemicalmoundsformed in shallow water by the trapping, binding and cementation of sedimentary grains bymicrobial matsofmicroorganisms, especiallycyanobacteria.They exhibit a variety of forms and structures, or morphologies, including conical, stratiform, branchingand columnar types. Stromatolites occur widely in the fossil record of thePrecambrian, Very few ancient stromatolites containfossilizedmicrobes. While features of some stromatolites are suggestive ofbiological activity.They peaked about 1.25 billion years agoand subsequently declined in abundance and diversity so that by the start of the Cambrian they had fallen to 20% of their peak. The most widely supported explanation is that stromatolite builders fell victim to grazing creatures (theCambrian substrate revolution,this theory implies that sufficiently complex organisms were common over 1 billion years ago.