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National Geologic Map Database

Geologic Unit: Tullos

Usage:

Tullos Member of Yazoo Clay of Jackson Group (LA)


Geologic age:

early Tertiary (late Eocene)


Type section, locality, area and/or origin of name:

Notable exposures in grade cuts of Missouri Pacific RR, 0.5 mi southwest of Tullos Station, La Salle Parish, central LA (Fisk, 1938).


AAPG geologic province:

Arkla basin


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).