For a century and a half, isolated sandstone bodies scattered in an east-west belt across the central part of Missouri have been interpreted as Pennsylvanian age filled sink-hole deposits, based on their geometry, distribution, and that they appeared to be the first significant sandstone above Ordovician carbonate units. However, sedimentary facies and facies associations indicate these sandstones were deposited by running water, possibly as valley-fills, over paleokarst surfaces. Additionally, they are often overlain by Ordovician through Mississippian strata and residuum, suggesting a range in age. The purpose of this study is to map these bodies using modern GIS techniques and to more fully document and describe their physical characteristics in order to better understand their origin and timing.
Below are links to three abstracts, an annotated PowerPoint presentation, and two posters from meetings of the American Association of Petroleum Geologists and the Geological Association of America. Two manuscripts for publication are currently in preparation.
Little, W.W., Chapman, A.D. & Meehan, D.N., 2017, Upper Ordovician incised valley (karst) fill deposits of central Missouri: a reinterpretation of “Pennsylvanian filled sinks: Abstracts for the 100th Anniversary Annual Convention and Exhibition, American Association of Petroleum Geologists, Houston, TX. (Abstract – Under Theme I: Siliciclastics: Challenging Basins/Mixed Systems) (Poster in prep)
Meehan, D.N., Chapman, A.D. and Little, W.W., 2016, Detrital zircon evidence for Late Ordovician uplift, paleokarsting, and drainage reorganization in the Ozark Dome and vicinity, south-central Missouri: Geological Society of America Abstracts with Programs, V. 48, No. 7 (doi: 10.1130/abs/2016AM-287738). (Abstract) (Poster)
Little, W.W., 2004, Pennsylvanian A reexamination of Pennsylvanian sink fill deposits in Missouri: Are they Pennsylvanian and are they sink fills? Abstracts and Program for the North-central Section of the Geological Society of America, St. Louis, MO. (Abstract) (Annotated PowerPoint Presentation)
Publications (in prep):
Little, W.W. & Chapman, A.D., in prep, Upper Ordovician incised valley (karst) fill deposits of central Missouri: a reinterpretation of “Pennsylvanian filled sinks: to be submitted for publication with Bulletin of the Geological Society of America.
Meehan, D.N., Chapman, A.D. and Little, W.W., in prep., Major Paleozoic provenance changes in the Midcontinent: constraints from U-Pb detrital zircon geochronology: to be submitted for publication in Lithosphere of the Geological Society of America.