Stratigraphy and structure of Dixon Mountain-Little Water Canyon area Beaverhead County, Montana Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8k71nk59s

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Approximately 23 square miles of the east-central part of the Tendoy Range are included in the thesis area which lies three miles west of Dell, Montana. Rocks ranging in age from Late Mississippian to Recent are exposed in the study area. The upper Paleozoic section includes approximately 4,200 feet (1,281 m.) of strata which are divided into four formations. The nine formations of Mesozoic aae total approximately 2,960 feet (903 m.) plus part of the Cretaceous-Tertiary Beaverhead Formation. Cenozoic strata in the thesis area include Beaverhead conglomerates, basaltic andesite flows, tuffs, and breccias, and unconsolidated gravels, alluvium, and alluvial fan gravels. The thesis area was examined in detail to define formation distribution and structural complications. The Triassic and Jurassic (Ellis Group) rocks were examined specifically in an effort to interpret their depositional environments. Sedimentary structures, fossils, and petrographic evidence indicate a shallow subtidal and intertidal setting for the deposition of Triassic rocks. Algal laminated strata within the Woodside Formation have not previously been described. Much of the Ellis Grout:, was deposited under shallow subtidal and locally shoaling conditions. Glauconite calcarenites in the Swift Formation may represent deposition in sand waves. Folding and faulting within the thesis area represent the overlapping influence of geosynclinal and cratonic tectonism in the hinge line setting of the Tendoy Range. The imposition of a southward-plunging anticline on a southwestward-plunging syncline has resulted in the overturning of the northern limb of the syncline. A low-angle thrust with eastward vergence has been developed in the Dry Canyon area. The thrust has been cut by a later high-angle reverse fault. White Knob strata (Mississippian) have been carried into the western margin of the thesis area on the Medicine Lodge thrust. The economic possibilities are not encouraging. The phosphate deposits of the thesis area have been analyzed and deemed uneconomical. Distance from intrusions precludes the chance of significant mineralization in the area. The petroleum potential for the area is doubtful. Late Cretaceous folding and erosion may have allowed escape of hydrocarbons from the potential source and reservoir rocks of the region. However, the Medicine Lodge thrust sheet may conceal structural and stratigraphic configurations capable of trapping oil and gas.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 24-bit Color) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-01-21T20:44:16Z (GMT) No. of bitstreams: 4 KleckerRichardA1981.pdf: 10909392 bytes, checksum: 3b3bd3ad735694620aae7c5f0c6976e0 (MD5) Plate 1.jpg: 17429115 bytes, checksum: 48d7175fe5b108ccc7f60350d3c162c8 (MD5) Plate 2.jpg: 13765306 bytes, checksum: e2e0b77b8b18afd744afa5e18359498b (MD5) Plate 3.jpg: 4701600 bytes, checksum: b2322797a94cd68f8e6f2b0fba7ada03 (MD5)
  • description.provenance : Submitted by Sergio Trujillo (jstscanner@gmail.com) on 2014-01-15T18:25:11Z No. of bitstreams: 4 KleckerRichardA1981.pdf: 10909392 bytes, checksum: 3b3bd3ad735694620aae7c5f0c6976e0 (MD5) Plate 1.jpg: 17429115 bytes, checksum: 48d7175fe5b108ccc7f60350d3c162c8 (MD5) Plate 2.jpg: 13765306 bytes, checksum: e2e0b77b8b18afd744afa5e18359498b (MD5) Plate 3.jpg: 4701600 bytes, checksum: b2322797a94cd68f8e6f2b0fba7ada03 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-01-15T20:26:29Z (GMT) No. of bitstreams: 4 KleckerRichardA1981.pdf: 10909392 bytes, checksum: 3b3bd3ad735694620aae7c5f0c6976e0 (MD5) Plate 1.jpg: 17429115 bytes, checksum: 48d7175fe5b108ccc7f60350d3c162c8 (MD5) Plate 2.jpg: 13765306 bytes, checksum: e2e0b77b8b18afd744afa5e18359498b (MD5) Plate 3.jpg: 4701600 bytes, checksum: b2322797a94cd68f8e6f2b0fba7ada03 (MD5)
  • description.provenance : Made available in DSpace on 2014-01-21T20:44:16Z (GMT). No. of bitstreams: 4 KleckerRichardA1981.pdf: 10909392 bytes, checksum: 3b3bd3ad735694620aae7c5f0c6976e0 (MD5) Plate 1.jpg: 17429115 bytes, checksum: 48d7175fe5b108ccc7f60350d3c162c8 (MD5) Plate 2.jpg: 13765306 bytes, checksum: e2e0b77b8b18afd744afa5e18359498b (MD5) Plate 3.jpg: 4701600 bytes, checksum: b2322797a94cd68f8e6f2b0fba7ada03 (MD5) Previous issue date: 1980-05-29

Relationships

In Administrative Set:
Last modified: 08/07/2017 Default
Citations:

EndNote | Zotero | Mendeley

Items