Tullock Member

{{Short description|Geologic formation in Montana}} {{Infobox rockunit | name = Tullock Member | image = | caption = | type = Member | age = Early Paleocene (Puercan) | period = Danian | prilithology = | otherlithology = | namedfor = Tullock Creek | namedby = Rogers and Lee (1923) | region = Montana, Wyoming | country = United States | coordinates = | unitof = Fort Union Formation | subunits = | underlies = Lebo Member | overlies = Hell Creek Formation (MT), Lance Formation (WY) | thickness = 90–400 m (Powder River Basin) | extent = | area = | map = | map_caption = }}

thumb | right | alt=Coal stratigraphy of the Powder River Basin (USGS). | Coal stratigraphy of the Powder River Basin (USGS). The '''Tullock Member''' is a geologic member in Montana and Wyoming, forming the lowermost part of the Fort Union Formation. It is also known less commonly as the '''Tullock Formation''', forming part of the Fort Union Group.<ref name="Geolex_Publ">{{Cite web |title=Geologic Unit: Tullock |url=https://ngmdb.usgs.gov/Geolex/Units/Tullock_10976.html |access-date=2025-06-01 |website=National Geologic Map Database |publisher=United States Geological Survey}}</ref> It preserves fossils dating back to the Paleogene period.

==See also== {{Portal|Earth sciences|Paleontology}} * List of fossiliferous stratigraphic units in Montana * Paleontology in Montana

==References== * {{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= ((Various Contributors to the Paleobiology Database))|url= https://www.fossilworks.org|access-date= 17 December 2021}} {{Reflist}}

Category:Geologic formations of the United States Category:Paleogene Montana Category:Puercan Category:Geologic members of the United States