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 ?
For example, in calcifying algae, supersaturation was recorded greater than 30-fold (McConnaughey & Falk 1991), in freshwater stromatolites, it was greater than 20-fold (Bissett et al.
The role of Diatoms in stromatolite growth: two examples from modern freshwater settings.
The shape of the stromatolite depended on the species of cyanobacteria, the amount of available sediment, the depth of the mound, and the amount of water energy.
These deposits were formed as microbial mats in a subtidal to intertidal environment of a shallow platform system, associated to planar-laminated stromatolites (Calvet et al., 1990).
Fluvial tufa represents barrages and mounds of mosses and stromatolites along the main course of the wadies.
It's one thing to read a description of a stromatolite and it's another to see a beach edged with them.
The method used in the study consisted of replicating the algorithm proposed by Petrisor and Decho for the study of the orientation of cyanobacteria in marine stromatolites (Petrisor and Decho, 2006).
Recently, McNamara and Awramik (1992 [16]) have concluded, from the study of stromatolite, that at about 700 m.y.
There is persuasive evidence, including microbial fossils and stromatolites, that microbial life was present on the Earth as early as 3.4 Gyr ago.
Small structures, considered to be stromatolites, similar to the laminar and small domal stromatolite Ozarkcollenia, occur in ferruginous Mesoproterozoic bedded tufts of the Cope Hollow Formation near Johnson's Shut-ins, Reynolds County, Mo.
They are the remnants of pyroclastic flows covered in part with collapsing stromatolite deposits.
2:00 Investigating the Marine Stromatolite Microenvironment Using GIS Remote Sensing Techniques and Simulations with Fluorescent Microbeads Incorporated in Gel Capsules.