Approximate western limit of glaciation within the Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, South Dakota

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This coverage contains information about the western limit of glaciation within the Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, South Dakota. 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 [...]

本数据集发布于2016年10月1日之前，彼时美国地质调查局（U.S. Geological Survey, USGS）规范科学数据审核、批准与发布的相关政策尚未生效；该政策详见《美国地质调查局调查手册》第502.8章《基本科学实践：科学数据发布的审核与批准》。本数据集覆盖范围涵盖北达科他州苏县、南达科他州科森县境内立岩印第安人保留地内的冰川作用西界相关信息。本数字化数据集由美国地质调查局（USGS）与美国环境保护署联合制作完成。本数据集基于Howells（1982）中的图5经屏幕扫描与数字化处理生成。如需获取更多详细信息，请参阅交叉引用资料。据[...]