- Usage in publication:
-
- Devil's Pass member
- Modifications:
-
- Named
- Dominant lithology:
-
- Conglomerate
- Sandstone
- AAPG geologic province:
-
- Cascades province
- Okanogan province
Summary:
Named for Devil's Pass in northern part of Virginian Ridge Formation where type locality is exposed on Jackita Ridge, south of Devil's Pass [in Skull Mountain 7.5' quad] Whatcom Co, WA. Consists of over 1000-m sequence of chert-pebble conglomerate and chert-volcanic-lithic sandstone. Lower contact gradational with Slate Peak Member (new) of Virginian Ridge Formation. Upper part in north contains intermediate volcaniclastic rocks, possible Midnight Peak Formation precursors; is truncated by modern erosion surface. Upper part in south contains intercalated quartzofeldspathic sandstone beds interpreted as equivalent to feldspathic sandstone beds interpreted as equivalent to Winthrop Formation. Age inferred to be Late Cretaceous because of interbedding with possible Midnight Peak Formation (Campanian) precursors and interbedding with Late Cretaceous Winthrop Formation.
Source: GNU records (USGS DDS-6; Menlo 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 ([ ]).