- Usage in publication:
-
- Lost Creek Member
- Modifications:
-
- Named
- AAPG geologic province:
-
- Okanogan province
Summary:
Unit is named the Lost Creek Member of the Tiger Formation. Is exposed near Ione and Tiger in northeastern WA. Consists of massive to horizontally stratified biotite-hornblende granitic conglomerate and arkosic sandstone containing all intermediate grain-size and clast-percent variations. Overlies and pinches out over the Box Canyon Member (new) of the Tiger Formation; otherwise the base is not exposed. Thickness at the type section is 300 m; maximum is more than 2000 m. Age ranges from early middle Eocene, based on the inclusion of late early to early middle Eocene volcanic rock clasts, through middle Miocene, based on middle Miocene regional faults that bound the Tiger Formation, although the age determination of middle Miocene is less definite. (B1565)
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 ([ ]).