| State | Texas |
|---|---|
| Name | Eagle Ford Formation and Woodbine Formations, undivided |
| Geologic age | Late Cretaceous; Gulfian Series |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Unconsolidated > Coarse-detrital > Sand (Bed)
Minor
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)
|
| Comments | NE Texas. Eagle Ford Fm.---Shale and limestone. Upper part-- shale, compact, silty, contains fossil fish teeth and bones, 10 ft or more thick; middle part-- silty limest grading to calcar siltst, med gray weathers pale yellowish-brown, flaggy; lower part--shale, calcareous, dk gray, 7-50 ft thick. Thickness of Eagle Ford Formation 25-65 ft. In Texarkana Sheet (1966) thickness 60 ft feathers out east. In Sherman Sheet (1967) (NE Texas) shale, selenitic, bituminous, calcar concretions and septaria, thin platy beds of sandst. and sandy ls. in middle and upper part, med to dk gray; marine megafossils; thickness 300-400 ft. Woodbine Formation--various interlensing sequence of nonmarine, brackish-water, and marine beds of sand, clay, sandstone, and shale 350-600 ft thick. Woodbine fossils include ammonites, gastropods, pelecypods, brachiopods, and foraminifers. Contains volcanic sand and tuff. |
| Stratigraphic units | members of Woodbine (ascending) Dexter, Red Branch, Lewisville, and Templeton (Red River area) |
| References | Bureau of Economic Geology, 1966, Texarkana 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 | Bell - McLennan |