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    Sequence-Stratigraphic Analysis of the Rollins and the Cozzette Sandstone Members, the Upper Cretaceous Mount Garfield Formation of the Piceance Basin, Colorado.

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    Issue Date
    2011-08-31
    Author
    Ouaichouche, Fatma Zahra
    Publisher
    University of Kansas
    Format
    129 pages
    Type
    Thesis
    Degree Level
    M.S.
    Rights
    This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
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    Abstract
    Sequence-stratigraphic study of the Cozzette and the Rollins Sandstone members, of the Mt. Garfield Formation of the Mesaverde Group, in the southern part of the Piceance basin (western Colorado), utilizes mainly well-log data along with limited outcrop data. Outcrop description of the Rollins Sandstone Member indicates a depositional succession that changes from complex marginal marine deposits at the base to marine wave-dominated shoreface successions at the top. The lower marginal-marine deposits are interpreted to occur within multiple incised-valley fills that nest and form a main stratigraphic element landward, particularly within the uppermost part of the Cozzette Sandstone Member. Incised-valley fills thin basinward. Sequence-stratigraphic interpretation of the subsurface data provides a stratigraphic history similar to that interpreted from the outcrop exposures across a regional realm. The subsurface analysis of the study interval distinguishes 5 depositional sequences that change in thickness throughout the study area and are listed as follows: CZ1, CZ2, CZ3, R1 and R2. The depositional sequence R2 is the youngest incomplete sequence within the study interval. Each depositional sequence is composed of incised-valley fills at the base and highstand deposits with marine shoreface at the top. The incomplete depositional sequence R2 is represented by incised-valley fills alone. The vertical chronostratigraphic architecture of the sequence set (CZ1, CZ2, CZ3, R1) show a regional change in stacking pattern from retrogradational (CZ1, CZ2, and CZ3) to progradational (R1). The turnaround from retrogradational to progradational stacking is probably the stratigraphic limit between the Cozzette and the Rollins Sandstone members; its stratigraphic expression is probably gradational and complex in a landward direction. Incised valleys are superimposed landward, probably along axes between raised mires, and exhibit highly variable log patterns that reflect complex marginal-marine deposits.
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    http://hdl.handle.net/1808/9782
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    • Geology Dissertations and Theses [232]
    • Theses [3768]

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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