stromatolite

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stromatolite

(strō-măt′l-īt′)
n.
A usually rounded or columnar sedimentary structure consisting of alternating layers of carbonate or silicate sediment and fossilized microbial mats, produced over geologic time by the trapping, binding, or precipitating of minerals by groups of microorganisms, primarily cyanobacteria.

stro·mat′o·lit′ic (-măt′l-ĭt′ĭk) adj.

stromatolite

a rock-like mound, often found in fossil form (which can be over 3000 million years old), created by CYANOBACTERIA. It is possible that the fossil microbes within the stromatolite were able to produce oxygen from photosynthesis. If so, they are likely to have had a profound effect on the course of evolution of living forms.
References in periodicals archive ?
Cascade tufa manifest well defined stromatolitic lamination as evidence of periodic changes of physical factors, crystallization order and biological activity, due to different amount of organic material specially bacteria and cyanobacteria.
1967, Distribution and structure of Recent stromatolitic algal mats, eastern Andros Island, Bahamas: Annales Societe Geologique Belgique, Bulletin 90, p.
Beating these caveats in mind, data currently available indicate that stromatolitic microbial ecosystems, evidently including cyanobacteria and other members of the bacterial domain, were extant [approximately]3500 Ma ago (4, 5); methanogenic archaeans by [approximately]2800 Ma ago (6, 7); and gram-negative sulfate-reducing bacteria as early as [approximately]2700 Ma ago (8) and possibly earlier (9).
This portrayal of the environment in which stromatolitic communities flourished billions of years ago is a classic one.
Historical data records phosphate grades in massive sandstone in the range 5-24%, with stromatolitic phosphorite uniformly around 29-34%.
It is typically white to grey and light green, banded, and locally stromatolitic, calcareous to dolomitic marble interbedded with pelite, fine-grained quartzite, minor conglomerate, and mica schist.
They form a stromatolitic fabric with intercalated lenses of fibrous calcite/aragonite (Fischer et al.
Three generations of infillig are recognized in these cavities, separated by discontinuities, hard-grounds and/or stromatolitic crusts (Melendez et al.