Pg. 166-171. Tuttle sandstone member of Manning formation. Name applied to sandstone, 5 to 50 feet thick, in Manning formation about 75 feet above Goodbread sandstone member (new). Separated from overlying Yuma sandstone member by shaly zone 30 to 60 feet thick. Renick (Univ. Texas Bull., no. 3619, 1936) called unit Dilworth on assumption that it was equivalent to Dilworth sandstone of Gonzales County, east-central Texas. [Age is late Eocene (Jackson).]
Type locality: in abandoned Southern Pacific RR right-of-way 1.5 mi north of Piedmont, Grimes Co., east-central TX.
Source: US geologic names lexicon (USGS Bull. 1200, p. 3992).
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 ([ ]).