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Horse Spring Formation
The Horse Spring Formation is a geologic formation in Nevada. It preserves fossils dating back to the Neogene period. The lower unit is conglomerate and the middle and upper are sandstone and freshwater limestone. See also * List of fossiliferous stratigraphic units in Nevada * Paleontology in Nevada Paleontology in Nevada refers to paleontological research occurring within or conducted by people from the United States, U.S. state of Nevada. Nevada has a rich fossil Fossil record, record of plants and animal life spanning the past 650 million ... References Neogene geology of Nevada Conglomerate formations of the United States Sandstone formations of the United States Limestone formations of the United States Geologic formations of Nevada {{Neogene-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stromatolite
Stromatolites ( ) or stromatoliths () are layered Sedimentary rock, sedimentary formation of rocks, formations (microbialite) that are created mainly by Photosynthesis, photosynthetic microorganisms such as cyanobacteria, sulfate-reducing microorganism, sulfate-reducing bacteria, and Pseudomonadota (formerly proteobacteria). These microorganisms produce adhesive compounds that cementation (geology), cement sand and other rocky materials to form mineral "microbial mats". In turn, these mats build up layer by layer, growing gradually over time. This process generates the characteristic Lamination (geology), lamination of stromatolites, a feature that is hard to interpret, in terms of its temporal and environmental significance. Different styles of stromatolite lamination have been described, which can be studied through microscopic and mathematical methods. A stromatolite may grow to a meter or more. Fossilized stromatolites provide important records of some of the most ancient ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muddy Creek Formation
The Muddy Creek Formation is a geologic formation in Arizona, California, Nevada, and Utah. It preserves fossils dating back to the Neogene period. Distribution and General Expression The following description is from USGS Bulletin 798 by C. R. Longwell in 1928: In all the large intermontane valleys adjacent to the Muddy Mountains and neighboring ranges there are thick clays or silts and associated deposits that have been relatively little disturbed by crustal deformation. As a rule they form belts from a fraction of a mile to several miles wide on each side of present stream valleys, above which the clay outcrops rise to a maximum height of approximately 600 feet. Adjacent to the high lands they feather out, lapping up on the older rocks. Between the Muddy and Virgin Mountains the area occupied by the clays is from 9 to 12 miles wide. South of St. Thomas this large area is divided into two nearly equal belts by Virgin River, and to the north the clays are cut by the convergin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone Formations Of The United States
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar, because they are the most resistant minerals to the weathering processes at the Earth's surface. Like uncemented sand, sandstone may be imparted any color by impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Because sandstone beds can form highly visible cliffs and other topographic features, certain colors of sandstone have become strongly identified with certain regions, such as the red rock deserts of Arches National Park and other areas of the American Southwest. Rock formations composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conglomerate Formations Of The United States
Conglomerate or conglomeration may refer to: * Conglomerate (company) * Conglomerate (geology) * Conglomerate (mathematics) In popular culture: * The Conglomerate (American group), a production crew and musical group founded by Busta Rhymes ** Conglomerate (record label), a hip hop label founded by Busta Rhymes * The Conglomerate (Australian group), a jazz quartet See also * Conglomerate Ridge, in the Ellsworth Mountains, Antarctica * ConGlomeration (convention) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
