Pages authored by John R. Hill:

1. Surficial Geology / Landscapes of Indiana
   The early 20th-century geographer C.R. Dryer referred to the terrain of central Indiana as so monotonous that a visitor to the region “may ride upon the railroad train for hours without seeing a greater elevation than a haystack or a pile of sawdust.”
2. Mineral Resources / Aggregates
   The aggregates industry constitutes an integral segment of the nation's economy by providing raw material for highway construction, as the primary ingredient in concrete and asphalt and for a variety of other vital elements of everyday life. Aggregate raw material consists of crushed limestone, crushed dolomite, and sand and gravel.
3. Mineral Resources / Limestone
   Indiana Limestone, which is a Mississippian-age grainstone of very uniform texture and grade, has gained world-wide acceptance as a premier dimension stone. The Salem Limestone, which is the geologic formational name for this carbonate unit, crops out in a belt that trends southward from Stinesville in Monroe County to Bedford in Lawrence County.