GEOLOGIC MAPPING OF THE DRASCO AND MARCELLA QUADRANGLES, CLEBURNE AND STONE COUNTIES, ARKANSAS

These maps depict the bedrock and surficial geology of the Drasco and Marcella USGS 7.5-minute series topographic quadrangles in Cleburne and Stone counties, Arkansas. The area of investigation is in north-central Arkansas, situated on the Springfield and Boston Mountains plateaus of the Ozark Plateaus Province. Previous mapping by E.E. Glick, conducted in preparation for publication of the 1:500,000-scale Geologic Map of Arkansas (Haley et al., 1976), employed regional projection and subsurface data methods to map formation boundaries in an area that included these quadrangles. Data collected during current mapping expanded on earlier work by depicting the stratigraphy and structure of this area in greater detail than had been possible before. Using interpretations based on the 1,805 field locations they recorded and described in detail, the mappers were able to identify and depict multiple normal faults and folds, as well as delineate accurate contacts and divide geologic units mapped formerly as one unit. Detailed descriptive and stratigraphic information is now available for units spanning the middle Ordovician to the lower Pennsylvanian, including the previously understudied post-Pitkin/pre-Bloyd interval in north-central Arkansas.

This project was funded in part by the STATEMAP component of the National Cooperative Geological Mapping Program (NCGMP) administered by the USGS through Cooperative Agreement Award G22AC00358.