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Abstract
Chapter from: M
64: Sequence Stratigraphy of Foreland Basin Deposits
Edited By
J.C. Van Wagoner and G.T. BertramAuthors:
David R. Taylor and Richard W. W. Lovell Seismic/Sequence Stratigraphy
Published 1995 as
part of Memoir 64
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved. |
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Chapter 8
*
High-Frequency
Sequence Stratigraphy and Paleogeography of the Kenilworth Member, Blackhawk
Formation, Book Cliffs, Utah, U.S.A.
David R. Taylor
Chauvco Resources Ltd.
Calgary, Alberta, Canada
Richard W. W. Lovell
Esso Production Malaysia
Inc.
Kuala Lumpur, Malaysia
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ABSTRACT
Shallow-marine strata within the Campanian
Kenilworth Member of the Blackhawk Formation that crop out in the Book
Cliffs of east-central Utah were examined from their updip to downdip depositional
limits. Outcrop sections of 31 localities were measured, recording facies,
stratal surfaces, and paleoflow indicators. The geometry of stratal surfaces
and the continuity of sandstones were traced between measured sections
using binoculars and photographic panoramas of cliff exposures, and these
data were used to interpret the chronostratigraphic framework and define
the limits of depositional environments within the Kenilworth Member.
Sandstones of the Kenilworth Member are
interpreted to comprise parts of two high-frequency sequences. A sequence
boundary occurs within the Kenilworth and separates the highstand systems
tract of an older sequence from the lowstand and transgressive systems
tracts of a younger sequence. The sequence boundary can be recognized by
the presence of a regionally extensive erosional surface, an abrupt basinward
shift of the shoreline, and a change in parasequence stacking pattern.
The magnitude of the relative sea level fall that occurred within the Kenilworth
is estimated to be about 20 m, based on the amount of fluvial channel incision
observed at the sequence boundary. This magnitude of relative sea level
fall resulted in a basinward shift in the shoreline of 16 km. The resultant
paleoslope is calculated to be 0.07, comparable to depositional slopes
on the present-day Gulf of Mexico shelf.
Five wave-dominated shoreline parasequences
were recognized, each with a north-south to northwest-southeast paleoshoreline
orientation. The oldest four parasequences are part of the highstand systems
tract. Above the
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