Usage:
McKnight Formation (TX,Mexico)
McKnight Formation of Atascosa Group (TX-subsurface)
Geologic age:
Early Cretaceous
Type section, locality, area and/or origin of name:
Not stated. Name applied in subsurface west of San Marcos platform, southern TX. Name credited to Hedwig Kniker (Winter, 1961; 1962).
Reference section (composite; outcrop): lower part is from a bluff on right bank of West Nueces River on Bitter Ranch, 1.2 mi south of Tularosa road intersection with the "river road" northeastern Kinney Co., southern TX; upper part is from basal 75 ft of Chalk Bluff on Nueces River, 2 mi south of Nineteen Mile Crossing of State Highway 55 (Uvalde-Rock Springs road), western Uvalde Co., southern TX. Total section is exposed only in reference section. In Mexico the McKnight encircles the southeastern end of the Serrania del Burro (Lozo and Smith, 1964).
AAPG geologic province:
Ouachita folded belt
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 ([ ]).