FORWARD: Numerous Indiana geologists, quarries, and others have searched for, admired, photographed, climbed, sampled, drilled, cored, analyzed, and mined the exposed Silurian reefs of Indiana. From before 1862, when Richard Owen described the curious tilted outcrops of reefal limestone in several places in northern Indiana, pioneer geologists and others speculated on the origin of the reefs with ideas of structural deformation, arches, false bedding, and even volcanism. These imaginative ideas were generally set to rest in 1928 (Cumings and Shrock, 1928a, 1928b). Since then much more has been learned about the reefs (Shaver, 1991), numerous additional reefs have been discovered (Ault and others, 1976, 1992), and their practical usefulness for many chemical and physical products has expanded dramatically. From early pioneer times, quarries in northern Indiana, especially in the Wabash Valley, mined the reefs for roadstone and railroad ballast and burned the stone to make lime for mortar, agricultural lime, and whitewash. The reef rock was also used with other Silurian carbonate rock for foundation stone, flagging, and building stone.
Ault, C. H. 1992, Exposures of Silurian reefs in Indiana: Indiana Geological Survey Occasional Paper 61, 29 p.
You may also like:
Can't find what you're looking for? Feel free to contact us directly:
Publication Sales Office
Indiana Geological and Water Survey
611 North Walnut Grove
Bloomington, IN 47405-2208
IGS Return Policy
All sales are final. Materials may not be returned after they have been accepted by the customer. Any discrepencies in mail orders must be reported to IGWS within 10 days of receipt of order.
The Indiana Geological and Water Survey will refund the purchase price and sales tax of products if returned with the original sales receipt within 10 days of receipt of order. Refunds will be issued with the same method of payment as indicated on the original receipt except for cash purchases, which will be refunded by check. Items must be returned in the same condition as purchased. Refunds on digital products and services are not allowed, except for defective media such as CD-ROMs, flash drives, and so on. The customer is responsible for paying shipping costs to return items.