Buried valleys within the Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, South Dakota

This coverage contains information about the buried valleys within the Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, South Dakota. The delineation of the buried valleys was included as part of the surficial geology map (figure 5) created by Howells (1982). The digital data were produced by the U.S. Geological Survey (USGS) in cooperation with the U.S. Environmental Protection Agency. Figure 5 in Howells (1982) was scanned and digitized on-screen to create this coverage. See cross reference information for more detail. According to the map credit for figure 5, the geology for Sioux County was based on soil maps prepared by the U.S. Bureau of Indian Affairs (1959), data collected by Randich (1975), and a geologic map by Carlson (1978). The geology for Corson County was based on soil maps prepared by the U.S. Bureau of Indian Affairs (1959) and unpublished maps of the U.S Soil Conservation Service, modified by test drilling and field reconnaissance.本覆盖数据集（coverage）涵盖北达科他州苏县与南达科他州科森县境内立岩印第安保留地内的埋藏谷相关信息。埋藏谷的勾绘成果被纳入豪厄尔斯（Howells, 1982）编制的表层地质图（图5）中。本数字化数据集由美国地质调查局（U.S. Geological Survey, USGS）联合美国环境保护署共同制作完成。 豪厄尔斯（1982）中的图5经扫描与屏幕数字化流程后，生成了本覆盖数据集。如需更多细节，请参阅交叉引用信息。 根据图5的图注信息，苏县的地质数据基于美国印第安事务局（U.S. Bureau of Indian Affairs, 1959）编制的土壤图、兰迪奇（Randich, 1975）采集的实测数据以及卡尔森（Carlson, 1978）编制的地质图。科森县的地质数据则以美国印第安事务局（1959）编制的土壤图与美国土壤保持局未公开图件为基础，并通过试验钻探与野外踏勘进行了修正。