Usage:
Laycock Graywacke of Aldrich Mountains Group (OR*)
Subunits:
Ingle Tuff Tongue (OR*).
Geologic age:
Triassic, Late*
Type section, locality, area and/or origin of name:
Not designated. Named for Laycock Creek in southeast quarter of Mount Vernon quadrangle, Grant Co., northeastern OR (Brown and Thayer, 1966a, USGS I-447).
AAPG geologic province:
Blue 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 ([ ]).