USING 3-DIMENSIONAL MAPPING TO DETERMINE THE POSSIBILITY OF STRUCTURAL CONTROL ON DEVELOPMENT OF THE UPPER ORDOVICIAN LEXINGTON LIMESTONE, CENTRAL KENTUCKY, U.S.A.

The upper Lexington Limestone of Late Ordovician age has been interpreted to represent a structurally controlled, complex, facies mosaic. This facies mosaic has historically been interpreted to be a carbonate buildup of shoal complexes with interbedded shale units with intertonguing facies. Due to relatively recent advances in geographic-information-systems (GIS) mapping technologies, it is possible to generate three-dimensional (3-D) compatible maps to offer insight to the complexities of the upper Lexington Limestone and to determine if structural control affected the distribution of members. The resulting two-dimensional (2-D) and 3-D maps show that basement faults likely exerted a significant influence on facies distribution and formation. The 3-D maps further suggest that post-depositional structural activity during the Alleghanian orogeny resulted in large-scale deformation of the Lexington Limestone to generate structures like the Jessamine Dome