The Biology of Stromatolites. A stromatolite is a lithifying organo-sedimentary structure formed by the baffling, trapping and precipitation of particles by communities such as bacteria and algae to result in a layered rock-like structure (dupraz & wisscher.T., 2005).
Stromatolites are a major constituent of the fossil record of the first forms of life on earth. They peaked about 1.25 billion years ago and 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 (the Cambrian substrate ...
Stromatolite definition, a laminated calcareous fossil structure built by marine algae and having a rounded or columnar form. See more.
Stromatolite: Stromatolite, layered deposit, mainly of limestone, formed by the growth of blue-green algae (primitive one-celled organisms). These structures are usually characterized by thin, alternating light and dark layers that may be flat, hummocky, or dome-shaped. The alternating layers are largely
Define stromatolite. stromatolite synonyms, stromatolite pronunciation, stromatolite translation, English dictionary definition of stromatolite. n. A usually rounded or columnar sedimentary structure consisting of alternating layers of carbonate or silicate sediment and fossilized microbial mats,...
Stromatolites - The longest living organisms on the Earth This discussion topic submitted by Rachel Webb at 9:05 am on 6/7/01. Additions were last made on Saturday, May 4, 2002. Rachel Webb Coastal and Marine Ecology May 25, 2001. Stromatolites - Paleoenvironments and Present Environments in the Bahamas
All 48 occurrences of Archean stromatolites are regarded by those who reported them as meeting the biology-centered definition for stromatolites. Others have also similarly studied living stromatolites in order to establish criteria for determining the biogenicity of fossil stromatolites.
Stromatolites are not only Earth's oldest of fossils, but are intriguing in that they are our singular visual portal (except for phylogenetic determination of conserved nucleic acid sequences and some subtle molecular fossils) into deep time on earth, the emergence of life, and the evolving of the beautiful forms of life of modern time.
Laurence A. Cole, in Biology of Life, 2016. I first considered the timetable of when life had to first start. Planet Earth was made 4.54 BYA. Today, the oldest fossils that can be found are stromatolites from cyanobacteria 3.5 BYA. Cyanobacteria are quite sophisticated life-forms, which utilize photosynthesis, RNA, and oxidative phosphorylation.
the eruptions may have produced enough carbon dioxide to warm the global climate by 6 deg celsius. reduced temperature differences bwetween the equator and the poles would have slowed the mixing of ocean water, which in turn would have reduced the amount of oxygen available to marine organisms.