Title

Characterization of Folds in the Roubidoux Fm. Near Licking, MO

Presenter Information

Ashley Byerley

Department

Geosciences and Geological and Petroleum Engineering

Major

Geology

Research Advisor

Hogan, John Patrick

Advisor's Department

Geosciences and Geological and Petroleum Engineering

Funding Source

Missouri S&T Opportunities for Undergraduate Research Experiences (OURE) Program

Abstract

The Roubidoux Formation, near Licking, Missouri is folded into anticline-syncline pairs, which contrasts with horizontal sedimentary strata typical for the state. This folding reflects either 1) sagging of the strata (i.e., folding) due to karsting (cave collapse) in the underlying layers, or 2) a period of compressional plate tectonic activity leading to shortening of the strata by folding. To test these hypotheses I used detailed geologic mapping of an 80 meter road cut using a digital photomosaic, collection of orientation data of the bedding planes with a Brunton compass, and stereographic analysis to determine fold type and fold orientation. Ten separate folds form three coherent groups with each group having distinct orientations for the fold axial surfaces. Similarity of the fold axis orientations within each group suggests a common tectonic origin for these folds. However, the deflection of fold orientations from one group to the next suggests subsequent deformation event(s) leading to the rotation of fold axes. The younger event(s) may also have been tectonic, followed by late karsting.

Biography

Ashley graduate from St. Clair High School in 2007. She participated in the marching band, scholar bowl, and National Honor Society. In August 2007, Ashley attended University of Missouri-Rolla, now Missouri S&T.

Research Category

Sciences

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hallway

Presentation Date

06 Apr 2011, 9:00 am - 11:45 am

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Apr 6th, 9:00 AM Apr 6th, 11:45 AM

Characterization of Folds in the Roubidoux Fm. Near Licking, MO

Upper Atrium/Hallway

The Roubidoux Formation, near Licking, Missouri is folded into anticline-syncline pairs, which contrasts with horizontal sedimentary strata typical for the state. This folding reflects either 1) sagging of the strata (i.e., folding) due to karsting (cave collapse) in the underlying layers, or 2) a period of compressional plate tectonic activity leading to shortening of the strata by folding. To test these hypotheses I used detailed geologic mapping of an 80 meter road cut using a digital photomosaic, collection of orientation data of the bedding planes with a Brunton compass, and stereographic analysis to determine fold type and fold orientation. Ten separate folds form three coherent groups with each group having distinct orientations for the fold axial surfaces. Similarity of the fold axis orientations within each group suggests a common tectonic origin for these folds. However, the deflection of fold orientations from one group to the next suggests subsequent deformation event(s) leading to the rotation of fold axes. The younger event(s) may also have been tectonic, followed by late karsting.