Southeastern Section–56th Annual Meeting (29–30 March 2007)

Paper No. 12
Presentation Time: 11:40 AM


HUNDT, Kasey R., Department of Earth Sciences, University of Memphis, 2671 Central Terrace, Memphis, TN 38111, LUMSDEN, David, Earth Sciences, Univ. of Memphis, 402 Smith Bldg, Memphis, TN 38152 and COX, Randy, Department of Earth Sciences, Univ. of Memphis, Memphis, TN 38152,

The Late Paleozoic North American Craton shows a transition from the Ouachita–Appalachian Orogeny far-field deformation to a mid-continent NE-SW shortening trend. The location of this transition can provide information as to the stresses associated with the formation of Pangea. A unique opportunity to evaluate this stress orientation arose when, in 2005, a 2.5 km long section of the Lower Ordovician Cotter Dolomite was exposed during the construction of a highway bypass near the town of Hardy, AR. Structural features exposed include five reverse faults, 19 fault-related folds, and 17 joint zones. These features generally strike N-NE, and indicate NW-SE crustal shortening. Stereonet solutions suggest that this major NW-SE compression reactivated features having a NE-SW strike that had formed during a pre-existing tensional stress regime. The data are consistent with compression related to the Ouachita–Appalachian Orogeny. The NW-SE compression due to this event extends further north than previously recognized.