•  
  •  
 

Abstract

A digital geologic map of Rogers quadrangle was produced at 1:24,000 scale using the geographic information system (GIS) software Maplnfo. Data regarding stratigraphic relations observed in the field were digitized onto the United States Geological Survey (USGS) digital raster graphic (DRG) of Rogers quadrangle. The geology of Rogers quadrangle consists of sedimentary rocks of the Ordovician, Devonian, and Mississippian systems. The Cotter, Powell, and Everton formations represent the Ordovician System. The Clifty and Chattanooga formations represent the Devonian System. The St.Joe and Boone formations represent the Mississippian System. This mapping effort represents the first time stratigraphy of Rogers quadrangle was mapped utilizing digital technologies. The prominent geologic structures in Rogers quadrangle are east- west and north - south trending normal faults, commonly inferred from stratigraphic relations across small drainages inundated by Beaver Lake; the most extensive faulting was located in the Blackburn Creek arm and the Prairie Creek sub-basin of Beaver Lake. Complex faulting in the Prairie Creek area appears to have a long geologic history; here the Devonian Chattanooga Shale lies directly on top of the Ordovician Cotter formation, suggesting that the Ordovician Powell and Everton formations and much of the Devonian Clifty formation were either never deposited or have eroded from this area. In either case, the Prairie Creek area appears to represent a structural high developed during the Middle to Late Ordovician that was eventually inundated by rising sea level to permit deposition of the Chattanooga Shale. Detailed mapping of Rogers and other northwest Arkansas quadrangles is providing new insights into the geologic evolution of the southern continental craton and Ozark Plateaus during the Paleozoic Era.

Download

Share

COinS