Generalized thickness of the Madison Limestone and Englewood Formation, Black Hills, 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 data set is a polygon coverage created in ARC/INFO that represents the generalized thickness of the Madison Limestone and Englewood Formation, Black Hills, South Dakota. The thickness of the Madison Limestone and Englewood Formation was determined by substracting the elevation of the top of the Deadwood Formation from the elevation of the top of the Madison Limestone. The elevations for the tops of the formations were determined from geologic logs [...]

本数据集发布于2016年10月1日美国地质调查局（USGS）科学数据审查、批准与发布政策生效日前，该政策的制定依据《USGS勘测手册第502.8章：基础科学实践：科学数据发布的审查与批准》。本数据集为在ARC/INFO中创建的多边形覆盖图层，展示了南达科他州黑山地区麦迪逊灰岩（Madison Limestone）与恩格尔伍德组（Englewood Formation）的广义厚度。麦迪逊灰岩与恩格尔伍德组的厚度通过用麦迪逊灰岩顶面高程减去戴德伍德组（Deadwood Formation）顶面高程计算得出。各地层顶面高程均由地质测井资料[...]推导得到。