Hallopora can be commonly founded in what type of bedrock formation?
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Hallopora Hallopora is an extinct genus of bryozoans. They can be found in Ohio, Indiana, and Kentucky of the Midwestern United States, commonly in the Ordovician Kope Formation.
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Kope Formation The Kope Formation is one of the three component bedrock formations of the Maquoketa Group that primarily consists of shale (75%) with some limestone (25%) interbedded. In general, it has a bluish-gray color that weathers light gray to yellowish-gray and it occurs in northern Kentucky, southwest Ohio, and southeast Indiana, United States.
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Lithostrotion Lithostrotion is a genus of rugose coral which is commonly found as a fossil within Carboniferous Limestone. "Lithostrotion" is a member of the Lithostrotionidae family. The genus "Lithostrotion", a common and readily recognised group of fossils, became extinct by the end of the Palaeozoic era.
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Cupules Cupules ("kyoo'pyools") are humanly made depressions on rock surfaces that resemble the shape of a spherical cap or dome. They were made by direct percussion with hand-held hammer-stones, on vertical, sloping or horizontal rock panels. Cupules are the world’s most common rock art motifs, occurring in huge numbers in every continent except Antarctica. They were produced in many cultures, from the Lower Paleolithic to the 20th century, and they can be found on most lithologies. Similar artifacts from lithic Native American cultures are also known as cupstones.
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Allegheny Formation The Pennsylvanian Allegheny Formation is a mapped bedrock unit in western and central Pennsylvania, western Maryland and West Virginia, and southeastern Ohio. It is a major coal-bearing unit in the Appalachian Plateau of the eastern United States.
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Panhole A panhole is a depressed, erosional feature found on flat or gently sloping rock. Panholes are the result of long-term weathering and are generally seen on bedrock or very large blocks of rock. Similar terms are gnamma (Australia), opferkessel (German, roughly “sacrificial basin”), “armchair hollows”, weathering pans (or pits) and solution pans (or pits). Other German names include kamenitza and kamenica. In Spanish they are tinajita. In Portuguese and Galician are called pias.
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Cedar Sink Cedar Sink is a vertical-walled large depression, or sinkhole, in the ground, that is located in Edmonson County, Kentucky and contained within and managed by Mammoth Cave National Park. The sinkhole measures 300 ft from the top sandstone plateau to the bottom of the sink and was caused by collapse of the surface soil. The landscape is karst topography, which means the region is influenced by the dissolution of soluble rocks. Sinkholes, caves, and dolines typically characterize these underground drainage systems. Cedar Sink has a bottom area of about 7 acre and has more fertile soil compared to the ridgetops.
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Upper Elliot Formation The upper Elliot Formation is a stratigraphic unit dating to roughly between 200 and 190 million years ago and covering the Hettangian to Sinemurian stages. It is the upper portion of the Elliot Formation. The upper Elliot Formation is found in South Africa and Lesotho and is a component of the Stormberg Group within the Karoo Supergroup. It consists mainly of limestone, sandstone, and mudstone. Fossils of the prosauropod dinosaur "Massospondylus" have been recovered from the upper Elliot.
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Hato Formation The Hato Formation is a geologic formation dating to the Late Pleistocene in Curaçao. It preserves fossils.
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Coffee rock Coffee rock is the common name for the rock-like formations of indurated sands that were formed from ancient river sediments of the Pleistocene age.
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Kaiparowits Formation The Kaiparowits Formation is a sedimentary rock formation found in the Kaiparowits Plateau in Grand Staircase-Escalante National Monument, in the southern part of Utah in the western United States. It is over 2800 feet (850 m) thick, and is Campanian in age. This Upper Cretaceous formation was formed from alluvial floodplains of large rivers in coastal southern Laramidia; sandstone beds are the deposit of rivers, and mudstone beds represent floodplain deposits. It is fossiliferous, with most specimens from the lower half of the formation, but exploration is only comparatively recent, with most work being done since 1982. It has been estimated that less than 10% of the Kaiparowits formation has been explored for fossils. Most fieldwork has been conducted by The Natural History Museum of Utah.
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Tongeren Formation The Tongeren Formation (Dutch: "Formatie van Tongeren" ; abbreviation: TO) is a geologic formation in the subsurface of the Netherlands. The formation consists of shallow marine, epicontinental and continental sediments, predominantly clay and sand from the late Eocene and early Oligocene epochs (between 37 and 30 million years old). The Tongeren Formation is part of the Middle North Sea Group and correlates with the Tongeren Group from Belgian stratigraphy.
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Concretion A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin "con" meaning 'together' and "crescere" meaning 'to grow'. Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum.
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Bradford Clay Bradford Clay in geology, is a thin, rather inconstant bed of clay or marl situated in England at the base of the Forest Marble, the two together constituting the Bradfordian group in the Bathonian series of Jurassic rocks. The term "Bradford Clay" appears to have been first used by J. de. C. Sowerby in 1823 as an alternative for W. Smith's, "Clay on Upper Oolite". The clay came into notice late in the 18th century on account of the local abundance of the crinoid "Apiocrinus Parkinsoni". It takes its name from Bradford-on-Avon in Wiltshire, whence it is traceable southward to the Dorset coast and northward towards Cirencester. It may be regarded as a local phase of the basement beds of the Forest Marble, from which it cannot be separated upon either stratigraphical or paleontological grounds. It is seldom more than 10 feet thick, and it contains, as a rule, a few irregular layers of limestone and calcareous sandstone. The lowest layer is often highly fossiliferous; some of the common forms being "Arca minuta", "Ostrea gregaria", "Waldheimia digona", "Terebratula coarctata" and "Cidaris bradfordensis".
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Snow Hill Island Formation The Snow Hill Island Formation is a Late Cretaceous geologic formation found on James Ross Island, Antarctica. Dromaeosaur remains have been recovered from it, as well as the ornithopods "Trinisaura" and "Morrosaurus".
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Ooid Ooids are small (≤2 mm in diameter), spheroidal, "coated" (layered) sedimentary grains, usually composed of calcium carbonate, but sometimes made up of iron- or phosphate-based minerals. Ooids usually form on the sea floor, most commonly in shallow tropical seas (around the Bahamas, for example, or in the Persian Gulf). After being buried under additional sediment, these ooid grains can be cemented together to form a sedimentary rock called an "oolite". Oolites usually consist of calcium carbonate; these belong to the limestone rock family. Pisoids are similar to ooids, but are larger than 2 mm in diameter, often considerably larger, as with the pisoids in the hot springs at Carlsbad (Karlovy Vary) in the Czech Republic.
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Hall Formation The Hall Formation is a geologic formation in British Columbia. It preserves fossils dating back to the Jurassic period.
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Apón Formation The Apón Formation is a geological formation in northwestern Venezuela (Maracaibo Basin) and northern Colombia (La Guajira), whose thick-bedded limestone interbedded with subordinate amounts of dark gray calcareous shale and sandy shale strata date back to the Early Cretaceous (Late Aptian epoch). Pterosaur remains of "Ornithocheiridae indet." (= "?Anhangueridae indet.") are among the fossils that have been recovered from the formation.
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Volcanic pipe Volcanic pipes are subterranean geological structures formed by the violent, supersonic eruption of deep-origin volcanoes. They are considered to be a type of "diatreme". Volcanic pipes are composed of a deep, narrow cone of solidified magma (described as "carrot-shaped"), and are usually largely composed of one of two characteristic rock types — kimberlite or lamproite. These rocks reflect the composition of the volcanoes' deep magma sources, where the Earth is rich in magnesium. Volcanic pipes are relatively rare. They are well known as the primary source of diamonds, and are mined for this purpose.
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Hallirhoidae Hallirhoidae is an extinct family of heteroscleromorph demosponges found throughout the world from the Cretaceous to the Eocene, whereupon they became extinct. The highest concentration of species occurred in the Tethys Ocean during the upper Cretaceous. The hallirhoid demosponges were very distinctive-looking, largely pear-shaped sponges that were attached to the seafloor by a long stem-like stalk.
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Pluto's Cave Pluto's Cave is a partially collapsed lava tube on the northern outskirts of Mount Shasta. The tube is roughly 190,000 years old, which is quite old for a lava tube, as they normally collapse quickly (in geological terms), having ceilings only a few metres thick. However, Pluto's Cave is located in a semi-arid climate, where erosion is restricted, which contributes to its survival.
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Boxwork Boxwork is an uncommon type of mineral structure, or speleogen (similar to a speleothem, but formed by erosion rather than accretion), occasionally found in caves and erosive environments.