Danville Coal Member Thickness 2011

In the past a series of reports on coal resources of selected counties in Indiana was published as part of the Special Report series of the Indiana Geological Survey. These reports included maps showing thickness of the Danville Coal Member (Dugger Formation, Pennsylvanian). The thickness maps were based on coal-test records, mine-map notations, and interpretations of geophysical logs that are included in the files of the Indiana Geological Survey. Different thickness ranges were used in the various counties and for different purposes. Since 1980, staff members of the Indiana Geological Survey (IGS) have also collected and entered coal resource information into the NCRDS database as a cooperative project with the U.S. Geological Survey (USGS). The purpose of NCRDS database is to provide a means of rapid retrieval of point-source coal resource information, including coal location, thickness, depth, and other parameters. Based on all available data as of October 2010, a new map of Danville Coal Member thickness was created. It is the most current thickness map of the Danville Coal Member. Because additional data on coal thicknesses are obtained by the Indiana Geological Survey on an annual basis, interested users may wish to contact the Indiana Geological Survey for information on these more up-to-date sources.此前，印第安纳州地质调查局（Indiana Geological Survey）以特刊系列的形式，发布了多篇针对该州部分县域煤炭资源的研究报告。这些报告包含了展示丹维尔煤段（Danville Coal Member，宾夕法尼亚统达格组（Dugger Formation））厚度的相关图件。该厚度图件的编制依据包括印第安纳州地质调查局档案中收录的煤炭勘探测试记录、矿井图注记以及地球物理测井解释成果。不同县域及不同应用场景采用了差异化的厚度取值范围。自1980年起，印第安纳州地质调查局（Indiana Geological Survey, IGS）工作人员与美国地质调查局（U.S. Geological Survey, USGS）开展合作项目，将收集到的煤炭资源信息录入NCRDS数据库。NCRDS数据库的设计目标是实现点源煤炭资源信息的快速检索，涵盖煤炭点位、厚度、埋深及其他相关参数。基于2010年10月前的全部可用数据，研究团队编制了全新的丹维尔煤段厚度图，这也是目前最新的该煤段厚度分布图。由于印第安纳州地质调查局每年都会新增煤炭厚度相关数据，有需求的用户可联系该局获取此类最新数据源的相关信息。