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Geologic Unit: Tarrant
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  • Usage in publication:
    • Tarrant Formation*
  • Modifications:
    • Biostratigraphic dating
  • AAPG geologic province:
    • Ouachita folded belt
Publication:

Cobban, W.A., 1988, Tarrantoceras Stephenson and related ammonoid genera from Cenomanian (Upper Cretaceous) rocks in Texas and the Western Interior of the United States: U.S. Geological Survey Professional Paper, 1473, 51 p.


Summary:

Is formation in Eagle Ford Group in central TX. Is assigned a late middle Cenomanian (Late Cretaceous) age based on presence of the ammonite TARRANTOCERAS SELLARDSI near Round Rock, Williamson Co, TX in Ouachita tectonic belt province. Fauna places unit in CUNNINGTONICERAS AMPHIBOLUM AMPHIBOLUM subzone of C. AMPHIBOLUM zone.

Source: GNU records (USGS DDS-6; Denver GNULEX).


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 ([ ]).

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