Fort Union Formation - Tullock Member

Soft gray sandstone, gray and brown carbonaceous shale, and thin coal beds.
State Wyoming
Name Fort Union Formation - Tullock Member
Geologic age Paleocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Coal
Comments Oldest of the 3 Fort Union members
References
NGMDB product
Counties Campbell - Converse - Crook - Johnson - Natrona - Niobrara - Sheridan - Weston