Silurian Devonian aquifers

This data set represents the extent of the Silurian Devonian aquifers in the states of Michigan, Wisconsin, Illinois, Indiana, Ohio, Kentucky, and Tennessee.本数据集呈现了密歇根州、威斯康星州、伊利诺伊州、印第安纳州、俄亥俄州、肯塔基州和田纳西州境内志留纪（Silurian）与泥盆纪（Devonian）含水层（aquifer）的分布范围。