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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Upper Jurassic
Transgressive-Regressive Sequences, Mississippi Interior Salt Basin Area
Mancini, Ernest A.1,
Obid, Jamal A.1, and Puckett, T. Markham1
ABSTRACT
Three transgressive-regressive (T-R J1, T-R J2, and T-R
J3) sequences of 7 to 8 million years in duration are recognized in Upper
Jurassic to Lower Cretaceous non-marine, marginal marine and marine strata
of the Mississippi Interior Salt Basin area. These Oxfordian to Berriasian
sequences consist of transgressive and regressive systems tracts separated
by a surface of maximum transgression. The transgressive systems tract includes
a lower aggrading section and/ or an upper backstepping section, and the
regressive systems tract is comprised of an infilling section. The T-R J1
sequence (Oxfordian to Kimmeridgian) consists of Norphlet non-marine deposits
(transgressive aggrading), Norphlet shoreface and lower Smackover subtidal
lime mudstone beds (transgressive backstepping), and upper Smackover shoal
and shoreface grainstone and pack-stone and Buckner sabkha anhydrite deposits
(regressive infilling). The T-R J2 sequence (Kimmeridgian to Tithonian) includes
Buckner subaqueous (saltern) anhydrite, lower Haynesville lagoonal anhydrite
and shale, and middle Haynesville shallow marine shale and limestone deposits
(transgressive backstepping) and upper Haynesville marginal marine shale
and sand-stone and lower Cotton Valley (Shongaloo) marginal marine and coastal
plain deposits (regressive infilling). The T-R J3 sequence (Tithonian to
Berriasian) consists of upper Cotton Valley (Dorcheat) marine shelf beds
(transgressive backstepping) and Dorcheat nearshore marine and fluvial deposits
(regressive infilling). These T-R sequences have utility for regional correlation
across the northern Gulf of Mexico. The Oxfordian (Smackover), the Late Kimmeridgian
(Haynesville), and the Berriasian (Cotton Valley) marine flooding events
have potential for global correlation.
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