- Usage in publication:
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- Calispell Lake Member
- Modifications:
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- Original reference
- AAPG geologic province:
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- Okanogan province
Summary:
Calispell Lake Member of Tiger Formation. The Calispell Lake Member, here named, is in the revised Tiger Formation in the Cusick region, northeastern Washington. Consists of polymictic conglomerate interbedded with rippled and laminated fine-grained sandstone, siltstone, and clay. Conformably and unconformably overlies the Winchester Creek Member (new name) of the Tiger. Correlates with the Jared Member (new name) and records erosion of older Tiger strata. Thickness is 350 m. Age ranges from early middle Eocene, based on inclusions 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.
Type section: north-facing roadcut, in NE/4 SE/4 sec. 2, T. 32 N., [R. 43 E., Cusick 7.5-min quadrangle], Pend Oreille Co., WA.
Reference locality: along [Co. Hwy. 9205, Westside Calispell Road], in SW/4 SW/4 sec. 1 and W/2 NW/4 sec. 12, T. 32 N., [R. 43 E., Cusick 7.5-min quadrangle], Pend Oreille Co., WA.
Source: US geologic names lexicon (USGS Bull. 1565, p. 49-50).
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 ([ ]).