Digital Polygon Model Grid of the Hydrogeologic Framework of Bedrock Units for a Simulation of Groundwater Flow for the Lake Michigan Basin

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. The hydrogeologic framework for the Lake Michigan Basin model was developed by grouping the bedrock geology of the study area into hydrogeologic units on the basis of the functioning of each unit as an aquifer or confining layer within the basin. Available data were evaluated based on the areal extent of coverage within the study area, and procedures were established to characterize areas with sparse data coverage. Top and bottom altitudes for each [...]

本数据集发布于2016年10月1日之前，彼时美国地质调查局（United States Geological Survey, USGS）规范科学数据审核、批准与发布的相关政策尚未生效，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》。密歇根湖盆地模型的水文地质框架，通过将研究区基岩地质按其在盆地内作为含水层或隔水层的功能属性，划分为若干水文地质单元构建而成。研究人员基于各数据集在研究区内的覆盖范围对现有可用数据进行评估，并针对数据覆盖稀疏的区域制定了特征刻画流程。各[……]的顶、底海拔高度