[en] The Nemo Detail area covers 40 square miles in the eastern portion of the Black Hills Uplift. The region's geology is a combination of Precambrian igneous and metamorphic rocks, and overlying Early Paleozoic sediments and metasediments. The Paleozoics cover most of the eastern half of the area. A total of 7 groups of samples in uranium window constitute anomalies as defined in Volume I. These anomalies occur in locales of relatively high uranium and thorium with respect to the balance of the detail area. Magnetic data show a wide range of gradients; but fail to show a significant degree of correlation with available geologic interpretations or the radiometric data. Only one geochemical unit was defined on the basis of the radiometric criteria set forth in Volume I