Madison Group / Snake River Group / Coastal / ConnecGroup / Powder Mill Group / Springer Group / Baird Group / Colville Group / Nanushuk Group / Marquette Range Supergroup / Covada Group / Penasco Group / Lemhi Group / West Virquehanna Group / Russell / Dornick Hills Group / Arroyo Penasco Group / Tonto Group / Stanley Group / Claiborne Group / Belt Supergroup / Brimfield Group / /
Norman F. Sohl / Oligocene / Ralph W. Imlay / Santos Shale / Formation / Virgil A. Trent / Buck Tongue / Late Cretaceous / Mackenzie Gordon / Jr / Barnett Hill / Sand Branch (Chesterian) / GEORGE V. COHEE / Wallace de Witt / Jr / Cambria Felsite / Joseph E. Hazel / E. Van Alstine / Dudley D. Rice / Carey Dolomite / Andrews Schist / Cooper Marl / Early Pennsylvanian (Morrowan) / /
Position
author / /
ProvinceOrState
Virginia / Alabama / Alaska / Maine / North Dakota / Southern California / Louisiana / Nye County / Connecticut / Washington / Michigan / Piedmont / New Mexico / Utah / Montana / South Carolina / Oklahoma / Mississippi / California / Georgia / Arizona / Idaho / Colorado / Texas / Dakotas / Kentucky / Vermont / Wyoming / Maryland / Illinois / Nevada / Oregon / South Dakota / Tennessee / Pennsylvania / Delaware / North Carolina / Massachusetts / Arkansas / New Hampshire / /
Region
central Idaho / southwest Virginia / Southeastern North Carolina / western Montana / northwestern Georgia / Northern Nevada / central Colorado / northern Arizona / western Arkansas / eastern Montana / Northwestern Arizona / Southeastern Oklahoma / Eastern Oklahoma / eastern Kentucky / western Tennessee / central Montana / Southern California / Southwestern Utah / central Washington / Northern Wisconsin / central California / central Utah / Northeastern Washington / Northern Alaska / Southeastern Idaho / Northwestern Oregon / central Pennsylvania / central Oklahoma / Southeastern Alaska / Northwestern Wisconsin / southeastern California / Northeastern Alaska / northwestern New Mexico / Eastern Pennsylvania / northwestern Colorado / central Massachusetts / Western Utah / Southern Nevada / Southwestern Colorado / Southwestern Virginia / eastern Nevada / eastern South Carolina / northwestern Michigan / central Connecticut / central Alaska / /