Formation
body of rock identified by lithic characteristics and stratigraphic position; it is usually but not necessarily tabular and is mappable at the Earth's surface or traceable in the subsurface. Smaller than a subgroup
Trujillo Formation
Santa Rosa Sandstone
Colorado City Formation
Camp Springs Formation
Wills Point Formation
Shark River Formation
Kincaid Formation
Wellborn Formation
Abbott's Cliff Formation
Aber Mawr Shale
Chandler Bridge Formation
Bead Mountain Formation
Bear Bluff Formation
Redmond Formation
Chapin Peak Formation
Beattie Peaks Formation
Chappel Limestone
El Doctor Formation
El Paso Formation
Le Fret Formation
Leete Limestone
Charleston Sandstone
Ringold Formation
Lias Formation
Chatsworth Formation
Chattahoochee Formation
Chattanooga Shale
Elk River Formation
Chee Tor Limestone
Ella Island Formation
Ellis Bay Formation
Cherokee Shale
Elmore Formation
Chester Series
Bee Low Limestones
Empire Formation
Belcher Channel Formation
Belemnite Marls
Enfield Formation
Belle Plains Formation
Sadler Formation
Belvidere Formation
Escondido Formation
Bertie Group
Sargent Bay Formation
Cid Formation
Scarborough Formation
Ada Formation
Schistes de Fiennes
Claiborne Formation