Graduate Thesis Or Dissertation
 

Stratigraphy and structure of the Salt Wells Anticline area, Sweetwater County, Wyoming

Pubblico Deposited
default representative image
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pg15bk583

Descriptions

Attribute NameValues
Creator
Abstract
  • Approximately 4,210 feet of Late Cretaceous and 1,440 feet of Tertiary sedimentary rocks are exposed in the Salt Wells Anticline area of southcentral Sweetwater County, Wyoming. Late Cretaceous units include the Blair, Rock Springs, Ericson, and Almond Formations of the Mesaverde Group and the Lewis Shale; Tertiary units include the Paleocene Fort Union and the Eocene Wasatch Formations, and the Oligocene or Miocene Bishop Conglomerate. Alluvium, terrace gravels, and landslide debris are the most extensive Quaternary deposits. The Late Cretaceous rocks of the Rock Springs Uplift exhibit intricate intertonguing of marine and nonmarine facies, and they record the eastward regression of the Late Cretaceous sea. Intertonguing of environments in the region resulted from 1) deposition in a subsiding basin of detritus episodically shed from Laramide source areas to the west and northwest, and 2) periodic pulses of basin subsidence. Rocks of the Blair and Rock Springs Formations record marine depositional environments. Regressive littoral sandstones are found at the base and top of the Blair Formation and at the top of the Rock Springs Formation. Eastward encroachment of fluviatile deposits is marked by deposition of the Ericson and lower Almond Formations. Northerly coarsening of sandstones and southeasterly current directions in the Ericson indicate that the Wind River Mountains area was one probable source area. A second, more westerly source area is indicated by conglomerate lenses and easterly current directions in the upper Ericson Formation and by the thick sequence of continental deposits in the lower Almond Formation. Return of marine conditions is recorded by the transgressive marine deposits of the upper Almond Formation and the offshore marine shales and mudstones of the Lewis Shale. The latest Cretaceous rocks exposed on the Uplift record the final regression of the Cretaceous sea. The Cretaceous period ended with uplift of the Rock Springs area. The continental deposits of the Paleocene Fort Union Formation were deposited unconformably along the flanks of the Uplift; in turn, this formation is conformably overlain by the fluviatile red bed deposits of the Eocene Wasatch Formation. Contemporaneously with the deformation of the Uinta Mountains, the Salt Wells folds were superimposed on the southern part of the Uplift. During Oligocene or Miocene the Uplift was truncated by the Gilbert Peak pediment surface. Quaternary fluvial erosion has deeply dissected the Rock Springs Uplift.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Dichiarazione dei diritti
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale, 24-bit Color) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Le relazioni

Parents:

This work has no parents.

In Collection:

Elementi

Thumbnail Titolo Data caricata Visibilità Azioni
file details HartmanDonaldAlbert1968.pdf 10/25/2017 Pubblico
file details Map.jpg 10/25/2017 Pubblico