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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Palmer, James, Thomas L. Thompson, Cheryl Seeger, James F. Miller, and Jay M. Gregg,
DOI:10.1306/13331527M983518
2012 by The American Association of Petroleum Geologists.
The Sauk Megasequence from the Reelfoot Rift to Southwestern Missouri
James Palmer,1 Thomas L. Thompson,2 Cheryl Seeger,3 James F. Miller,4 Jay M. Gregg5
1Missouri Department of Natural Resources, Division of Geology and Land Survey, Rolla, Missouri, U.S.A.; Retired
2Missouri Department of Natural Resources, Division of Geology and Land Survey, Rolla, Missouri, U.S.A.; Retired
3Missouri Department of Natural Resources, Division of Geology and Land Survey, Rolla, Missouri, U.S.A.
4Department of Geography, Geology and Planning, Missouri State University, Springfield, Missouri, U.S.A.
5Boone Pickens School of Geology, Oklahoma State University, Stillwater, Oklahoma, U.S.A.
ACKNOWLEDGMENTS
Our understanding of the stratigraphy of Missouri has been greatly dependent on the contributions and mentoring of the late Wallace B. Howe of the Missouri Geological Survey, Vincent E. Kurtz (retired) of Missouri State University, and Paul E. Gerdemann (retired) of St. Joe Minerals Corporation. Their friendship, encouragement, and willingness to share their knowledge have been a gift whose value cannot be overstated.
Much of the work by the authors has been supported by the Missouri Division of Geology and Land Survey for the past several decades.
ABSTRACT
Middle Cambrian–Lower Ordovician (Sauk megasequence) rocks of southern Missouri have attracted interest because they host the large Mississippi Valley-type ore deposits of that region. A Proterozoic igneous and metamorphic complex nonconformably underlies this megasequence and Mississippian and Pennsylvanian strata unconformably overlay these units. Strata of the Sauk megasequence in southern Missouri include, in ascending order, the Cambrian Lamotte Sandstone, Bonneterre Dolomite, Davis Formation, Derby-Doerun Dolomite, Potosi Dolomite, and Eminence Dolomite, which are overlain by the Ordovician Gasconade Dolomite, Roubidoux Formation, Jefferson City Dolomite, and Cotter Dolomite.
Cambrian depositional facies in southern Missouri are small- to large-scale, unconformity-bounded, transgressive-regressive sequences, and are characterized by distinct facies in linear belts that developed on and adjacent to basement highs. These include intrashelf-basin facies distal from basement highs, platform-edge facies in narrow belts adjacent to highs, and back-reef facies proximal to and within the St. Francois Mountains. A distinct rift-graben facies is characteristic of deposition of these units in the Reelfoot rift. An epeiric sea that extended over the region controlled Lower Ordovician deposition. Lower Ordovician strata are composed of five third-order sequences, punctuated by regional and subregional unconformities.The strata are characterized by facies that have regional lateral continuity.
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