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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
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AAPG Bulletin, V.
Sequence
Stratigraphic
Analysis
of the St. Peter Sandstone and Glenwood Formation
(Middle Ordovician), Michigan Basin, U.S.A.
1Manuscript received August 20, 1998;
revised manuscript received August 18, 1999; final acceptance November
15, 1999.
2Department of Geological Sciences,
Ohio University, Athens, Ohio 45701.
3Department of Geology and Geophysics,
University of Wisconsin, 1215 W. Dayton St., Madison, Wisconsin 53706.
ABSTRACT
sequence
in the Michigan
basin. Core and
well
log
data show that the St. Peter-Glenwood interval
contains numerous carbonate units that provide the basis for both regional
correlation and subdivision of the section into at least 20 high-frequency
sequences. The temporal resolution afforded by these sequences allows a
detailed
analysis
of sediment partitioning as the basin evolved. The spatial
distribution of the basal sequences illustrates the pronounced east-to-west
onlap of the Wisconsin arch. An abrupt increase in
sequence
thickness upsection
indicates that a major episode of basin-centered subsidence began during
middle St. Peter deposition and continued through the deposition of the
Glenwood Formation. The upper sequences show a significant beveling of
the Glenwood Formation and the top of the St. Peter Sandstone in the north,
south, and southeast areas of the basin prior to deposition of the overlying
Black River carbonates. Although eustatic sea level changes were undoubtedly
operating at several scales, the facies distribution of this mixed clastic/carbonate
system also documents significant changes of local and regional tectonics.
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