Usage:
Notch Peak Formation (NV*,UT*)
Subunits:
(alphabetical) --all in UT*: Hellnmaria Member, Lava Dam Member, Red Tops Member.
Geologic age:
Cambrian, Late*
Franconian*
Trempealeauan*
Ordovician, Early*
Canadian*
Type section, locality, area and/or origin of name:
Type locality: upper part of main mass of Notch Peak, House Range, western UT (Walcott, 1908).
Principal reference section [composite]: Notch Peak 15-min quadrangle, [Sneakover Pass area], central House Range, Millard Co., central western UT; lower part in SE/4 sec. 35 [unsurveyed], T. 19 S., R. 13 W., and in sec. 2, T. 20 S., R. 13 W.; middle and upper parts in sec. 5 [unsurveyed], T. 20 S., R. 13 W. (Hintze and others, 1988).
Reference sections: (1) Steamboat Pass-Lava Dam section [composite], in S/2 sec. 18 and NW/4 sec. 19, T. 23 S., R. 13 W., The Barn 15-min quadrangle (1960 ed.), southern House Range, Millard Co., central western UT; (2) Lawson Cove section [composite], in sec. 30, T. 24 S., R. 14 W., Frisco Peak 15-min quadrangle, and in sec. 4, T. 25 S., R. 15 W., Wah Wah Summit 15-min quadrangle, Gray Hills area, Wah Wah Mountains, Millard Co., central western UT (Hintze and others, 1988).
AAPG geologic province:
Great Basin 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 ([ ]).