Stromatolite

Romani AM, Sabater S (1997) Metabolism recovery of a stromatolitic biofihn after drought in a Mediterranean stream. Arch Hydrobiol 140(2) 261-271... 

Moorbath S, Taylor PN, Orpen JL, Treloar P, Wilson JF (1987) First direct radiometric dating of Archaen stromatolitic limestone. Natnre 326 865-867... 

Prokaryote heterotrophs precursors of cyanobacteria. Stromatolites. Sulfur bacteria Beginning of photosynthesis Traces... 

Textural fabrics in sediments that record the structure and/or function of biological communities (e.g. stromatolites). 

Recently, researchers have detected 2,5-dimethylfuran and 2-methylfuran and normal alkanes in kerogen of the 2.7 x 109 year old Belingwe, Rhodesia stromatolites, by the method of pyrolysis/ GC/MS [26]. They concluded that although furans could probably be derived from many compounds, their probable origin is in bacterial and algal sugars, and that the alkanes are either products of decarboxylation of fatty acids or unaltered constituents of ancient organisms. 

Stal LJ (2000) Cyanobacterial mats and stromatolites. In Whitton BA, Potts M (eds) The ecology of cyanobacteria their diversity in time and space. Kluwer Academic, Netherlands,... 

Harder EC (1919) Iron-depositing bacteria and their geologic relations. US Geol Surv Prof Pap 113 Hartman H (1984) The evolution of photosynthesis and microbial mats a speculation on banded iron formations. In Microbial Mats Stromatolites. Cohen Y, Castenholz RW, Halvorson HO (eds) Alan Liss Pub, New York, p 451-453... 

Stromatolites Domal concretions formed on the seafloor, primarily shallow waters, by microorganisms. These deposits represent the oldest unequivocal fossilized remains of life on Earth. 

STROMATOLITE. A term that has been generally applied to variously shaped (often domal), laminated, calcareous sedimentary structures formed in a shallow-water environment under the influence of a mat or assemblage of sediment-binding blue-green algae that trap fine (silty) detritus and precipitate calcium carbonate and that commonly develop colonies or irregular accumulations of a constant shape, but with little or no... 

The time period in which prebiotic synthesis of organic compounds took place is frequently misunderstood. The earth is 4.5 x 109 years old, and the earliest fossil organisms known, the Warrawoona microfossils and stromatolites, are 3.5 x 109 years old.10 The difference is 1.0 x 109 years, but the time available for life to arise was probably shorter. It probably took a few hundred million years for organisms to evolve to the level of those found in the Warrawoona formation. In addition, if the earth completely melted during its formation, then the time available would be further shortened by the time needed for the earth to cool down sufficiently for organic compounds to be stable. 

Stromatolites are known for more than 3 billion years313-315, whereas the first shell-forming Metazoa appeared 600 Million years ago, when the sea may have become saturated with respect to CaC03. Nannofossils represent an even later de-... 

Walter, M. R., Golubic, S-, and Preiss, W. V. Recent stromatolites from hydromagnesite and aragonite depositing lakes near the Coorong Lagoon, South Australia. J. Sed. Petrol. 43, 1021-1030 (1.973). 

Awramik, S.M., Schopf, J.W., Walter, M.R. (1988). Carbonaceous filaments from North Pole, Western Australia. Are they fossil bacteria or ancient stromatolites A discussion. Pre-Cambrian Research, 39, 303-309. 

Fig. 10. UV-absorption spectrum of a filamentous organic microstructure from Transvaal stromatolite (ca. 2200 MY). Beam diameter of the instrument was below 1 pm. Absorption shoulders at 280 nm and 26S nm were assigned to nitrogenous organic compounds containing double bonds (L. Nagy, 1978) 35)...

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