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Indiana University
Indiana University Bloomington: Reference Documents: Indiana Coal [Pdf]
A fact card describing the properties and characteristics of Indiana coal, how it formed, the volume of coal resources, their location in the state, and where this coal ranks on a coal scale.
Indiana University
Indiana University Bloomington: Geo Notes: Indiana's Reef Rocks [Pdf]
Describes the reef rocks of Indiana, how they developed, and their economic importance for their natural resources.
Indiana University
Indiana University Bloomington: Geo Notes: Limestone: Indiana's State Stone [Pdf]
Describes the formation of limestone deposits in Indiana and limestone's importance as an economic resource.