Mississippi River Valley alluvial aquifer

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 represents the extent of the Mississippi River Valley alluvial aquifer in the states of Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.

本数据集发布于2016年10月1日美国地质调查局（United States Geological Survey，简称USGS）科学数据审核、批准与发布政策生效日期之前；该政策的相关依据可参照USGS《调查手册第502.8章：基础科学实践——科学数据发布的审核与批准》。本数据集涵盖密西西比河流域冲积含水层在密苏里州、肯塔基州、田纳西州、阿肯色州、密西西比州及路易斯安那州的分布范围。