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Chisos Formation of Schiebout et al (1987) and the Big Yellow Sandstone Member of their Tornillo Formation, undivided (TXOGEOc;0)
Geologic Formation
in
TX
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Lithology
Bentonite
Trachyte
Conglomerate
Other
(590 mi²)
Geologic Age
Eocene – Oligocene (56 Ma – 23.03 Ma ago)
Geologic Unit Label
OGEOc
Chisos Formation of Schiebout et al (1987) and the Big Yellow Sandstone Member of their Tornillo Formation, undivided
—
USGS
Taxonomy
Classified As
Geologic Formation
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