Catahoula Formation (TXOGc;0)

State	Texas
Name	Catahoula Formation
Geologic age	Oligocene
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Sand (Bed) Sedimentary > Clastic > Mudstone (Bed) Minor Sedimentary > Clastic > Conglomerate (Bed) Incidental Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed) Igneous > Volcanic > Felsic-volcanic > Trachyte Igneous > Volcanic > Felsic-volcanic > Rhyolite Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff)
Comments	Crystal City-Eagle Pass Sheet (1976), upper member, Chusa Tuff Mbr is tuffaceous mudstone and sand and sandstone about 180 ft thick. next member descending is Soledad Volcanic Conglo. Mbr, abdt. pebbles, cobbles, and boulders up to one foot in size, rhyolite, trachyte, trachyandesite, thickness up to 75 ft; Fant Tuff Mbr, lowest mbr., tuff, claystone, and sandstone about 600 ft thick. Catahoula Fm. 120-300 ft thick on Seguin Sheet (1974) thins northward. In East Texas and Gulf Coast to Rio Grande: Mudstone and sand. Upper 300-500 ft mudst., tuffaceous, sandy, lt. gray, weathers dk gray. Some bentonitic clay. Lower 10-80 ft quartz sand, coarse grained, grains polished, opal cement common; fossil wood abdt. forms cuesta. Thickness 300-600 ft.
Stratigraphic units	descending--Chusa Tuff Mmember, Soledad Volcanic Conglomerate Member, Fant Tuff Member
References	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, 1967, Palestine Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, 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	NGMDB product page for 68390
Counties	Angelina - Atascosa - Bee - Brazos - DeWitt - Duval - Fayette - Gonzales - Grimes - Jasper - Karnes - Lavaca - Live Oak - McMullen - Newton - Polk - Sabine - Trinity - Tyler - Walker - Washington - Webb

State

Texas

Name

Catahoula Formation

Geologic age

Oligocene

Lithologic constituents

Major

Unconsolidated > Coarse-detrital > Sand (Bed)

Sedimentary > Clastic > Mudstone (Bed)

Minor

Sedimentary > Clastic > Conglomerate (Bed)

Incidental

Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed)

Igneous > Volcanic > Felsic-volcanic > Trachyte

Igneous > Volcanic > Felsic-volcanic > Rhyolite

Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff)

Comments

Crystal City-Eagle Pass Sheet (1976), upper member, Chusa Tuff Mbr is tuffaceous mudstone and sand and sandstone about 180 ft thick. next member descending is Soledad Volcanic Conglo. Mbr, abdt. pebbles, cobbles, and boulders up to one foot in size, rhyolite, trachyte, trachyandesite, thickness up to 75 ft; Fant Tuff Mbr, lowest mbr., tuff, claystone, and sandstone about 600 ft thick. Catahoula Fm. 120-300 ft thick on Seguin Sheet (1974) thins northward. In East Texas and Gulf Coast to Rio Grande: Mudstone and sand. Upper 300-500 ft mudst., tuffaceous, sandy, lt. gray, weathers dk gray. Some bentonitic clay. Lower 10-80 ft quartz sand, coarse grained, grains polished, opal cement common; fossil wood abdt. forms cuesta. Thickness 300-600 ft.

Stratigraphic units

descending--Chusa Tuff Mmember, Soledad Volcanic Conglomerate Member, Fant Tuff Member

References

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, 1967, Palestine Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, 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

NGMDB product page for 68390

Counties

Angelina - Atascosa - Bee - Brazos - DeWitt - Duval - Fayette - Gonzales - Grimes - Jasper - Karnes - Lavaca - Live Oak - McMullen - Newton - Polk - Sabine - Trinity - Tyler - Walker - Washington - Webb