Usage:
La Porte Tuff (CA)
Geologic age:
early Tertiary (Oligocene)
Type section, locality, area and/or origin of name:
Locality of sample (Dalrymple, July, 1964): 2,000 ft S. 16 deg. W. from NE corner of sec. 8, T. 21 N., R. 9 E., in Upper Dutch Diggings, Downieville quadrangle, northern CA.
La Porte flora (Potbury, 1935) occurs on west flank of the Sierra Nevada, 15 mi northwest of La Porte, Plumas Co., northern CA. Town of La Porte is near west edge of Downieville quadrangle. 1 mi north and a little west of town in NE/4 sec. 8, T. 21 N., R. 9 E., in the Upper Dutch Diggings is the tuff bed in which occurs the La Porte flora. The leaf-bearing bed is at top of cliff on west side of the diggings.
AAPG geologic province:
Sierra Nevada province
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 ([ ]).