Usage:
Pysht Formation of Twin River Group (WA*)
Geologic age:
Tertiary
Oligocene, late*
Miocene, early*
Type section, locality, area and/or origin of name:
Shore-cliff exposures along 18 km of Juan de Fuca, from Pillar Point State Park (center sec. 10, T. 31 N., R. 11 W.) east to point 3.5 km west of Low Point (SW/4 sec. 19, T. 31 N., R. 9 W.), Clallam Co., WA (Snavely and others, 1978).
AAPG geologic province:
Olympic Mountains 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 ([ ]).