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Hooper Formation

Hooper Formation
State Texas
Name Hooper Formation
Geologic age Phanerozoic | Cenozoic | Tertiary | Paleocene
Comments Mostly mudstone with various amounts of sandst., minor lignite, ironstone concretions, and locally glauconite in lowermost part. Mudst. med gray to dk gray, weathers yell-brn. Sandst. in upper part---fine to med. grained, mod well sorted, crossbedded, units 5-30 ft thick; thickness as much as 500+-ft.
Primary rock type mudstone
Secondary rock type sandstone
Other rock types
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Coal > Lignite (Bed)
Map references
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
Unit references
Bureau of Economic Geology, 1974, Austin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Counties Bastrop - Falls - Freestone - Lee - Limestone - Milam - Navarro - Robertson