| State | Texas |
|---|---|
| Name | Upson Clay |
| Geologic age | Late Cretaceous; Gulfian Series |
| Lithologic constituents | Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
|
| Comments | In Kinney and Maverick Cos., TX, Clay, sl. calcareous, dark gray to greenish gray; weathers yell-gray; marine megafossils include Exogyra ponderosa; thickness as much as about 500 ft, thins northward. Lowest part of Taylor Group. |
| Stratigraphic units | Taylor Group |
| References | Dumble, E.T., 1892, Notes on the geology of the valley of the middle Rio Grande: Geological Society of America Bulletin v. 3, p. 219-230.Bureau of Economic Geology, 1976, Crystal City-Eagle Pass Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000. |
| NGMDB product | |
| Counties | Kinney - Maverick |