Regional Cretaceous stratigraphic relationships across the southern segment of the Western Interior basin, Arizona, New Mexico, and southern Colorado

Conference · Fri Mar 01 00:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7259890

Molenaar, C M; Cobban, W A; Franczyk, K J; Pillmore, C L; Zech, R S ^[1]; Kauffman, E G ^[2]; Holbrook, J M ^[3]; Wolfe, D G

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1. U.S. Geological Survey, Denver, CO (United States)
2. Univ. of Colorado, Boulder (United States)
3. Indiana Univ., Bloomington, IN (United States)

Cretaceous strata in Arizona, New Mexico, and southern Colorado were deposited in the southern part of the asymmetric Western Interior basin and consist of east- and northeastward-prograding clastic wedges of shoreface sandstones and coastal-plain deposits separated by thick tongues of west- and southwestward-extending marine shale and, on the eastern shelf, by limestone. The interlayering of the two primary facies (sandstone and shale) is the result of either regional subsidence, eustasy, sediment supply, or a combination of these. Constructing and comparing regional cross sections will aid in accomplishing one of the goals of the Western Interior Cretaceous (WIK) project of the International Union of Geological Science's Global Sedimentary Geology Program, which is to identify the global effects of eustasy. Preserved Cretaceous strata in this part of the Western Interior basin range from a few hundred feet thick on the east to about 7000 ft on the west. A cross section across this area reveals facies relations, major sequence boundaries, unconformities, and available biostratigraphic and chronostratigraphic data for the sections preserved in the present Laramide basins. Sequence boundaries occur in the middle late Albian, at the base of the late Turonian, and within the latest Turonian. Younger sequence boundaries, if present, are less obvious, and their associated unconformities have not been identified.

• OSTI ID: 7259890
• Report Number(s): CONF-910403-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
ARIZONA
SEDIMENTARY BASINS
COLORADO
NEW MEXICO
CORRELATIONS
STRATIGRAPHY
COMPARATIVE EVALUATIONS
CRETACEOUS PERIOD
SANDSTONES
SEA LEVEL
SHALES
VARIATIONS
DEVELOPED COUNTRIES
EVALUATION
FEDERAL REGION IX
FEDERAL REGION VI
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOLOGY
LEVELS
MESOZOIC ERA
NORTH AMERICA
ROCKS
SEDIMENTARY ROCKS
USA
580000* - Geosciences