Tullock Member

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.^[1]. It preserves fossils dating back to the Paleogene period.

Tullock Member
Stratigraphic range: Early Paleocene (Puercan)
Type	Member
Unit of	Fort Union Formation
Underlies	Lebo Member
Overlies	Hell Creek Formation (MT), Lance Formation (WY)
Thickness	90–400 m (Powder River Basin)
Location
Region	Montana, Wyoming
Country	United States
Type section
Named for	Tullock Creek
Named by	Rogers and Lee (1923)

Coal stratigraphy of the Powder River Basin (USGS).

See also

• Earth sciences portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Montana
• Paleontology in Montana