Depth to top of the Inyan Kara Group

This data set is a polygon coverage created in ARC/INFO that represents the depth to the top of the Inyan Kara Group below the land surface, Black Hills, South Dakota.本数据集为基于ARC/INFO创建的多边形覆盖数据，表征美国南达科他州黑山（Black Hills）区域内地表以下因扬卡拉群（Inyan Kara Group）顶面的埋深。