Valley and Ridge aquifers

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 Valley and Ridge aquifers in the states of New York, New Jersey, Pennsylvania, Maryland, Virginia, West Virginia, Tennesse, Georgia, and Alabama.

本批数据的发布时间早于美国地质调查局（USGS）科学数据审核、批准与发布政策的2016年10月1日生效日期，该政策详见《美国地质调查局勘测手册第502.8章：基础科学实践：科学数据发布的审核与批准》。本数据集涵盖纽约州、新泽西州、宾夕法尼亚州、马里兰州、弗吉尼亚州、西弗吉尼亚州、田纳西州、佐治亚州及阿拉巴马州境内的河谷与山脊含水层（Valley and Ridge aquifers）的分布范围。