- Usage in publication:
-
- Crystal River Siltstone Member
- Modifications:
-
- Named
- Dominant lithology:
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- Siltstone
- Arkose
- AAPG geologic province:
-
- Eagle basin
Summary:
Named as a member (1 of 5) of Gothic Formation for exposures in the Crystal River valley, Pitkin Co, CO in the Eagle basin. Type locality designated as section measured in sec 20, T9S, R88W, 6 mi north of Redstone on southeast slopes of ridge south of Perham Creek and opposite Avalanche Creek road. Is 137 ft thick at type where member is composed of brown, very fine micaceous to very fine to silty, very micaceous arkose and gray-yellow to red, calcareous, very thinly bedded, flaggy siltstone that has planar cross-bedding and raindrop imprints. Overlies Brush Creek Limestone Member (new) of Gothic. Underlies and intertongues with Hot Springs Conglomerate Member (new) of Gothic. Of [Middle] Pennsylvanian, Desmoinesian age. Cross section.
Source: GNU records (USGS DDS-6; Denver 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 ([ ]).