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Showing 1 to 8 of 8 for “"Microbialite"”.
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The Growth and Ecology of Upper Cambrian Microbialite Biostromes from the Notch Peak Formation in Utah
… morphology and ecology of two upper Cambrian microbialite reefs located within the Hellnmaria Member of the Notch Peak Formation. The first reef contains meter-length, strongly elongate microbialites that grew in a deep, subtidal marine environment. These elongate microbialites formed as a …
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Influence of Organic Matter Source, Abundance, and Growth Habit on Depositional Textures and Associated Pore Attributes of Hypersaline Lacustrine Microbial Deposits (Holocene, Bahamas)
Discovery of lacustrine microbialite reservoirs in South Atlantic pre-salt has motivated the search for analogs for perspectives on their deposition and initial porosity. Although previous efforts mapped spatial patterns and produced facies models of large microbial lacustrine systems, details of …
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Paragenesis of Lacustrine Microbialites in the Upper Wilkins Peak Member, Green River Formation, Wyoming
<p>Microbialites from the upper Wilkins Peak Member were investigated to determine their paragenesis and to help interpret lake chemistry. Two specific microbialite beds were analyzed that are associated with the “layered tuff”. Samples were collected from correlated sections along a NW to SE, 24 …
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Controls on Carbonate Factory Distribution in a Restricted Intraplatform Basin: Upper Jurassic Smackover, Southwest Alabama
… microbially produced lime mudstone, with minor microbialite and peloidal packstone. A restricted marine environment led to low oxygen conditions, with high nutrient levels due to internal waves or regional upwelling. Although the contribution of terrestrial nutrients was likely minimal, …
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Responses of a shallow-water ecosystem to the early Paleogene greenhouse environmental conditions : evolution of Larger Foraminifera and coral communities from the Northern Tethys
… forces. The study of Late Thanetian metric-sized microbialite-coral mounds which developed in the middle part of the ramp, documented the first Cenozoic occurrence of microbially-cemented mounds. The development of these mounds, with temporary dominance of microbial communities over corals, …
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The palaeoredox condition and morphological variation of microbialites from the Nama Group, South Africa
Microbialites are the fossilised traces of microbial communities and are present in the rock record since the Paleoarchean, 3.5 billion years ago, making microbialites some of the earliest direct evidence for life on Earth. Microbialites exhibit a wide variety of macrostructures and fabrics, …
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Stromatolitic Knobs in Storrs Lake, San Salvador, Bahamas: Insights into Organomineralization
… which have developed calcified structures called microbialites. Many of these microbialites are laminated, and therefore classified as stromatolites. This study focuses on small stromatolitic knobs located in the southern portion of Storrs lake, which are still actively forming, to gain insights …
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Depositional constraints on lacustrine carbonates from the Winnemucca Dry Lake Basin, Nevada, USA
<p>Carbonate mineral formation in lakes is a consequence of the interactions of lake water chemistry, physical processes at several scales, and biological influences, all of which are greatly affected by individual lake basin attributes such as basin size and physiography, bedrock geology, …