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 ?
Stromatolitic communities in Mediterranean streams: conditions to a changing environment.
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.
Microherms in the Smackover consist of concentrically laminated (stromatolitic), clotted (thrombolitic), calcimicrobial, or structureless (leiolitic) carbonate, and texturally resemble associated oncoids (algal balls).
226 Large stromatolitic formations uncovered at low tide in Shark Bay (Western Australia).
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.
Stromatolitic biostrome of the Cambrian Fengshan Formation at the Xiaweidian section in the western suburb of Beijing, North China.
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.
Microfacies, Carbon and Oxygen Isotopes of the Late Archaean Stromatolitic Carbonate Platform of the Kaapvaal Craton, South Africa: Implications for Changes in Paleo-environment.