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National Geologic Map Database
Geologic Unit: Pleasant View
Map showing publication footprint
  • Usage in publication:
    • [/]Pleasant View member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
    • Claystone
  • AAPG geologic province:
    • Denver basin
Publication:

LeRoy, L.W., 1946, Stratigraphy of the Golden-Morrison area, Jefferson County, Colorado: Colorado School of Mines Quarterly, v. 41, no. 2, p. __.


Summary:

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).


Map showing publication footprint
  • Usage in publication:
    • Pleasant View Member
  • Modifications:
    • [Abandoned]
  • AAPG geologic province:
    • Denver basin
Publication:

Van Horn, Richard, 1976, Geology of the Golden quadrangle, Colorado: U.S. Geological Survey Professional Paper, 872, 116 p.


Summary:

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.

"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 ([ ]).