2024 Joint North-Central & South-Central Section Meeting

Gary Michelfelder, Missouri State University, GaryMichelfelder@missouristate.edu; Hanlin Zhang, Missouri State University, hz423s@MissouriState.edu.

Description: This two-day field trip will explore the Mid-Continent granites and rhyolites of the St. Francois Mountains. Field stops will visit classic locations on the volcanic stratigraphy of rhyolites and associated ring granitoid plutons of the Mesoproterozoic calderas. We will also visit lesser-known locations related to younger plutons.

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Matthew McKay, Missouri State, matthewmckay@missouristate.edu; William Jackson, University of Memphis, wtjckson@memphis.edu.

Description: The Ouachita Mountains of Arkansas form the western arm of a major orogen in late Paleozoic Laurentia. This two-day, one night field trip departing from Springfield, Missouri will showcase pre- to syn-orogenic strata and well-exposed Ouachita structures.

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Charles Rovey, Missouri State University, charlesrovey@missouristate.edu; Damon Bassett, Missouri State University, dbassett@missouristate.edu.

Description: This one-day trip provides an overview of Paleozoic carbonate stratigraphy in southwest Missouri. Stops display evidence for: (1) seismic activity during deposition of Ordovician peritidal strata; (2) proximal-to-distal facies changes within the Mississippian carbonate platform; and (3) a brief influx of deltaic siliciclastics during the Middle Mississippian.

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Wendell Barner, Barner Consulting, LLC, Wendell.barner@gmail.com; Doug Gouzie, Missouri State University, douglasgouzie@missouristate.edu.

Description: This one-day field trip will visit several sinkhole sites within the Springfield area and discuss historical development issues which led to the city-wide and eventually to a county-wide regulatory approach to construction near sinkholes. We will also visit sinkholes which have occurred since regulations were implemented and review current approaches to dealing with sinkholes in urban areas.

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Douglas Gouzie, Missouri State University, douglasgouzie@missouristate.edu; James McDaniel, Missouri State University, jim898s@missouristate.edu.

Description: This half-day trip will examine the Burlington Formation, primarily viewing the unit in a quarry pit used to provide aggregates for the original Route 66 highway construction. From the open pit, we will continue into an underground quarry turned into cold storage warehouse space and explore the relationships between geology, public works projects, and profitable business operations.

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Kevin Ray Evans, Missouri State University, kevinevans@missouristate.edu; Joseph T. Hannibal.

Description: The historic Phenix quarry, located between Ash Grove and Walnut Grove, Missouri, has provided building stone from the upper part of the Mississippian Burlington-Keokuk Limestone since 1888 and finished dimension stone since the early 1900s. The Phenix Marble Company produced Napoleon Gray® and Ozarks Fleuri® varieties, cut perpendicular and parallel with bedding, respectively. Production was curtailed during the Great Depression and World War II, but the need for repairs and renovations of existing and installation of new applications has brought renewed interest reviving production of Phenix marble. Since the mid-2010s, the re-organized Phenix Marble Company has installed state-of-the-art cutting, polishing, and finishing equipment to fulfill increased demand for finished dimension stone. This Half-day field trip will visit exposures of the Burlington-Keokuk Limestone near Willard, Missouri, and facilities of the Phenix Marble Company.

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Aaron W. Johnson, The American Institute of Professional Geologists, awj@aipg.org.

Description: This two-day trip will focus on geology of the host rocks and the processes by which these world-class deposits were emplaced. This field trip will include a tour of one of the active underground mines in the Viburnum Trend with other potential stops at surface outcrops if time and weather permit.

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