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- Bear_Gulch_Limestone abstract "The Bear Gulch Limestone in Montana is a fossiliferous lagerstätte, a limestone layer laid down in the Mississippian epoch of the Carboniferous period, about 318 mya. This lens of limestone was laid down in a surrounding matrix that indicates a landscape of mudflats and braided channels (linear sandstone seams) in fresh and brackish water, in an arid climate (gypsum formation). Magnetic orientation of particles relative to the bedding planes of the strata suggest a latitude of about 12°N, a tropical siting.In the Bear Gulch Limestone, many genera of fossil fishes and some invertebrates were occasionally preserved in detail when they died and sank to the bottom of a shallow marine or estuarine lagoon. In such cases, conditions on the silty bottom preventing the usual bacterial decomposition are usually invoked, characterized as close to anoxic, thus suppressing ordinary bacterial decomposition; however, fossils of fishes of distinctly bottom-dwelling type are present, and traces of worm burrows or similar bottom disturbance show that sufficient oxygen was available in the upper levels of bottom silt. Pulses of hypoxic or anoxic conditions and perhaps periodic episodes of heavy siltation—the lagoon laid down up to 90 ft/30 m of limestone during its existence— may have been involved. The numerous genera and many body types represented by fossils are witnesses to a highly diversified ecology with many available niches to be filled by specialists.".
- Bear_Gulch_Limestone thumbnail Bear_gulch_montana_sea_urchin.jpg?width=300.
- Bear_Gulch_Limestone wikiPageExternalLink bear_gulch.
- Bear_Gulch_Limestone wikiPageID "6503835".
- Bear_Gulch_Limestone wikiPageRevisionID "587225629".
- Bear_Gulch_Limestone hasPhotoCollection Bear_Gulch_Limestone.
- Bear_Gulch_Limestone subject Category:Carboniferous_paleontological_sites.
- Bear_Gulch_Limestone subject Category:Geology_of_Montana.
- Bear_Gulch_Limestone subject Category:Lagerstätten.
- Bear_Gulch_Limestone subject Category:Limestone.
- Bear_Gulch_Limestone subject Category:Natural_history_of_Montana.
- Bear_Gulch_Limestone subject Category:Paleontological_sites_of_North_America.
- Bear_Gulch_Limestone subject Category:Paleontology_in_the_United_States.
- Bear_Gulch_Limestone type CarboniferousPaleontologicalSites.
- Bear_Gulch_Limestone type GeographicalArea108574314.
- Bear_Gulch_Limestone type Location100027167.
- Bear_Gulch_Limestone type Object100002684.
- Bear_Gulch_Limestone type PaleontologicalSitesOfNorthAmerica.
- Bear_Gulch_Limestone type PhysicalEntity100001930.
- Bear_Gulch_Limestone type Region108630985.
- Bear_Gulch_Limestone type Site108651247.
- Bear_Gulch_Limestone type Tract108673395.
- Bear_Gulch_Limestone type YagoGeoEntity.
- Bear_Gulch_Limestone type YagoLegalActorGeo.
- Bear_Gulch_Limestone type YagoPermanentlyLocatedEntity.
- Bear_Gulch_Limestone comment "The Bear Gulch Limestone in Montana is a fossiliferous lagerstätte, a limestone layer laid down in the Mississippian epoch of the Carboniferous period, about 318 mya. This lens of limestone was laid down in a surrounding matrix that indicates a landscape of mudflats and braided channels (linear sandstone seams) in fresh and brackish water, in an arid climate (gypsum formation).".
- Bear_Gulch_Limestone label "Bear Gulch Limestone".
- Bear_Gulch_Limestone label "Bear-Gulch-Kalkstein".
- Bear_Gulch_Limestone sameAs Bear-Gulch-Kalkstein.
- Bear_Gulch_Limestone sameAs m.0g7wwl.
- Bear_Gulch_Limestone sameAs Q812979.
- Bear_Gulch_Limestone sameAs Q812979.
- Bear_Gulch_Limestone sameAs Bear_Gulch_Limestone.
- Bear_Gulch_Limestone wasDerivedFrom Bear_Gulch_Limestone?oldid=587225629.
- Bear_Gulch_Limestone depiction Bear_gulch_montana_sea_urchin.jpg.
- Bear_Gulch_Limestone isPrimaryTopicOf Bear_Gulch_Limestone.