Pg. 100 (fig. 23), 103-104, 105. [/]Pleasant View member of [/]Arapahoe-Denver formation. Sediments vary from poorly bedded clays to arenaceous shales with occasional lenticular beds of gray friable medium- to coarse-grained sandstones, which are best developed in lower third. Dominantly light gray. Sandstones suggest channel deposits by their cross-laminated and poorly sorted composition. Thickness averages about 113 feet on Table Mountains. Base corresponds to Cretaceous-Tertiary boundary, and is marked by distinct color change from tan to light brown. Underlies [/]Golden member (new). Age is Tertiary.
Type section: on eastern extremity of South Table Mountain, in NW/4 sec. 31, T. 3 S., R. 69 W., Morrison 7.5-min quadrangle. Recognized only on slopes of the Table Mountains, Jefferson County.
[The assignment of a unit to 2 adjacent formations, in one vertical sequence, is considered informal nomenclature (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). The use of a hyphen between undifferentiated formations is not considered proper notation (see CSN, 1933, Art. 13a, p. 437-438). Where the formations have not been separated in the field, it is considered proper notation to add the word "and", "undifferentiated", "included", etc.; and list formations in order of age (youngest first).]
Source: US geologic names lexicon (USGS Bull. 1200, p. 3065).
Pleasant View Member of undifferentianed Arapahoe-Denver Formation of LeRoy (1946) considered abandoned. Rocks included in undivided Denver Formation (follows classification of Emmons and others, 1898).
Source: Publication.
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
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Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).