Bear Gulch Limestone
http://dbpedia.org/resource/Bear_Gulch_Limestone an entity of type: WikicatCarboniferousPaleontologicalSites
Il giacimento di Bear Gulch, in Montana, è considerato uno dei più importanti siti fossiliferi del Carbonifero. Risale alla fine del Mississippiano (inizio del Carbonifero medio, circa 330 milioni di anni fa). Il deposito include alcuni dei più bei fossili di pesci di tutto il Paleozoico, grazie all'insolita completezza dei fossili e alla conservazione anche delle parti molli degli animali.
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The Bear Gulch Limestone is a limestone-rich geological lens in central Montana, renowned for the quality of its late Mississippian-aged fossils. It is exposed over a number of outcrops northeast of the Big Snowy Mountains, and is often considered a component of the more widespread Heath Formation. The Bear Gulch Limestone reconstructs a diverse, though isolated, marine ecosystem which developed near the end of the Serpukhovian age. It is a lagerstätte, a particular type of rock unit with exceptional fossil preservation of both articulated skeletons and soft tissues. Bear Gulch fossils include a variety of fish, invertebrates, and algae occupying a number of different habitats within a preserved shallow bay.
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Der Bear-Gulch-Kalkstein ist eine Fossillagerstätte in Montana. Die etwa 325 Millionen Jahre alten Ablagerungen aus dem Namurium, einem Zeitintervall des unteren Karbon (Paläozoikum), geben Einblick in eine Welt der Knorpelfische und frühen Haie. Die Fossilien sind sehr gut erhalten. Insgesamt wurden die Fossilien von etwa 130 Fischarten ausgegraben, aber auch Gliederfüßer, Schwämme, Seesterne, Würmer, Armfüßer, Moostierchen und Weichtiere. Unter den Fischen befinden sich die mit Schulterstacheln bewehrten Haiarten Falcatus und Stethacanthus sowie der ein durophages, auf hartschalige Nahrung hinweisendes Gebiss besitzende aus der Ordnung der Petalodontiformes. und der kaulquappenähnliche sind möglicherweise, mit Sicherheit, Verwandte der Seekatzen. Weitere Fische sind der Quastenflosse
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Bear Gulch Limestone
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Bear-Gulch-Kalkstein
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Bear Gulch
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Bear Gulch Limestone
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Late Serpukhovian ,
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Echinochimaera meltoni, one of many unusual chondrichthyans found in the Bear Gulch Limestone
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Mississippian
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The Bear Gulch Limestone is a limestone-rich geological lens in central Montana, renowned for the quality of its late Mississippian-aged fossils. It is exposed over a number of outcrops northeast of the Big Snowy Mountains, and is often considered a component of the more widespread Heath Formation. The Bear Gulch Limestone reconstructs a diverse, though isolated, marine ecosystem which developed near the end of the Serpukhovian age. It is a lagerstätte, a particular type of rock unit with exceptional fossil preservation of both articulated skeletons and soft tissues. Bear Gulch fossils include a variety of fish, invertebrates, and algae occupying a number of different habitats within a preserved shallow bay. Fish include a high diversity of unusual chondrichthyans (cartilaginous fish) and one of the oldest known lampreys, along with other vertebrates. Invertebrates include numerous fossils of crustaceans, worms, cephalopods, and sea sponges, which are concentrated in different parts of the bay basin. Shelled cephalopods are abundant, and the Bear Gulch Limestone also preserves some of the best early fossils of coleoid cephalopods. Fossils of typical benthic (seabed-attached) organisms are rare, and those that do occur are restricted to reef-like sponge patches in eastern exposures. This indicates that the conditions of the bay responsible for the Bear Gulch Limestone were at odds with other marine areas nearby. Some Bear Gulch fossils were preserved so rapidly and efficiently that mating behaviors, internal organs, coloration patterns, gut content, and even the pattern of blood vessels could be observed in fossils. This exceptional preservation may be a consequence of the prevailing warm monsoonal climate, as storms could frequently and rapidly cover the seabed with oxygen-poor organic runoff from shallower areas. Although up to 40 meters of sediment are found in the Bear Gulch Limestone, biostratigraphic data suggests that the lens was emplaced in only 1000 years, a geological instant.
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Der Bear-Gulch-Kalkstein ist eine Fossillagerstätte in Montana. Die etwa 325 Millionen Jahre alten Ablagerungen aus dem Namurium, einem Zeitintervall des unteren Karbon (Paläozoikum), geben Einblick in eine Welt der Knorpelfische und frühen Haie. Die Fossilien sind sehr gut erhalten. Insgesamt wurden die Fossilien von etwa 130 Fischarten ausgegraben, aber auch Gliederfüßer, Schwämme, Seesterne, Würmer, Armfüßer, Moostierchen und Weichtiere. Unter den Fischen befinden sich die mit Schulterstacheln bewehrten Haiarten Falcatus und Stethacanthus sowie der ein durophages, auf hartschalige Nahrung hinweisendes Gebiss besitzende aus der Ordnung der Petalodontiformes. und der kaulquappenähnliche sind möglicherweise, mit Sicherheit, Verwandte der Seekatzen. Weitere Fische sind der Quastenflosser , die beiden einzigen bisher gefundenen Gattungen der Guildayichthyidae, der aalartige Strahlenflosser und das älteste Neunauge .
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Il giacimento di Bear Gulch, in Montana, è considerato uno dei più importanti siti fossiliferi del Carbonifero. Risale alla fine del Mississippiano (inizio del Carbonifero medio, circa 330 milioni di anni fa). Il deposito include alcuni dei più bei fossili di pesci di tutto il Paleozoico, grazie all'insolita completezza dei fossili e alla conservazione anche delle parti molli degli animali.
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Bear Gulch, Montana
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