This map is the second, in a series of three, that depicts the surface geology of the north Arkansas zinc and lead region. The region is divided into two major focus areas: the north-central district and the northeast district. The larger north-central district is further split into two focus areas: western part and eastern part. The western part of the north-central district comprises portions of five 7.5-minute series topographic quadrangles including Bergman, Harrison, Omaha NE, Pyatt, and Zinc. The western part of the north-central district spans the Springfield and Salem Plateaus of the Ozark Plateaus Province. Approximately 700 feet of Lower Ordovician to Upper Mississippian carbonate and clastic rocks are exposed in this area.

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