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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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North America
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Williston Basin (1)
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United States
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Missouri River (1)
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Montana
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Garfield County Montana (1)
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McCone County Montana (1)
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Powder River basin (1)
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geologic age
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Cenozoic
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Tertiary
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Paleogene
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Eocene
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Golden Valley Formation (1)
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Paleocene
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Ravenscrag Formation (1)
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Wasatch Formation (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Fox Hills Formation (1)
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Hell Creek Formation (1)
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Lance Formation (1)
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Primary terms
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Cenozoic
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Tertiary
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Paleogene
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Eocene
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Golden Valley Formation (1)
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Paleocene
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Ravenscrag Formation (1)
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Wasatch Formation (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Fox Hills Formation (1)
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Hell Creek Formation (1)
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Lance Formation (1)
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North America
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Williston Basin (1)
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sedimentary rocks
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clastic rocks
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mudstone (1)
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sandstone (1)
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United States
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Missouri River (1)
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Montana
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Garfield County Montana (1)
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McCone County Montana (1)
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Powder River basin (1)
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rock formations
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Fort Union Formation (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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mudstone (1)
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sandstone (1)
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In 1907, Barnum Brown named the Hell Creek beds (Formation) for the strata exposed in the Hell Creek Valley and other downstream tributaries of the Missouri River. In the absence of a stratotype section, a lectostratotype is herein proposed for the Hell Creek Formation based on 84.2-m-thick exposures at Flag Butte (local name) in Ried Coulee (archaic use; East Fork of Hell Creek) and East Ried Coulee, tributaries of Hell Creek, Garfield County, Montana (sec. 29, T. 21 N., R. 38 W., NAD27 CONUS; base 47.55931°N, 106.88111°W; top 47.55533°N, 106.86810°W). The formation is underlain with general conformity by sandstone beds of the Fox Hills Formation (as characteristically known, the Colgate Member is absent) and is for the most part conformably overlain locally by the Tullock Member of the Fort Union Formation. The upper contact at Flag Butte is demarcated at the base of the IrZ lignite bed (above an iridium anomaly). The boundary has been demonstrated to be somewhat unconformable in areas to the west. The IrZ bed is also missing at Bug Creek in McCone County. In its type section, the Hell Creek Formation is subdivided (simply and informally) into Ried Coulee (lower Hell Creek), East Ried Coulee (middle Hell Creek), and Flag Butte (upper Hell Creek) units, each containing a sandstone and a mudstone lithofacies. Formational thickness varies with local depositional and erosional history of various coastal-deltaic environments across the Williston Basin and a trend of overall thinning to the east and northeast.