Deep Lakes member of the Fish Haven Dolomite is first used. Age is Ordovician. Fish Haven Dolomite divided into Paris Peak, Deep Lakes, and Bloomington Lakes Members (all new).
Area is beyond Bannock thrust in parts of Preston and Montpelier quadrangles, southeastern ID.
Source: GNU records (USGS DDS-6; Menlo GNULEX); US geologic names lexicon (USGS Bull. 1350, p. 198).
Deep Lakes Member of Fish Haven Dolostone. Interbedded light- and dark-gray dolostone; very finely to finely crystalline; medium- to very thick-bedded. Thickness averages 100 feet. Overlies Paris Peak Member of Fish Haven; underlies Bloomington Lake Member of Fish Haven. Age in north-central Utah probably late Late Ordovician based on fossil corals. Informally named in PhD thesis by Keller (1963).
Type section: on high ridge west of Bloomington Lake [Bear Lake Co.], southeastern ID. Origin of name not stated.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).
Deep Lakes Member of Fish Haven Dolomite. Reexamination of Lakeside Mountains section of Budge and Sheehan (1980). Units 2 through 15 of Budge and Sheehan assigned to Deep Lakes Member; thickness 62.9 m. Overlies Paris Peak Member and underlies Bloomington Lake Member (both of Fish Haven). Age is Late Ordovician (Cincinnatian). Report includes stratigraphic chart.
Lakeside Mountains section located near Delle, in NE/4 SE/4 sec. 32, T. 2 N., R. 8 W., Tooele Co., northeastern UT.
Source: Modified from 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 ([ ]).