Geologists collect and summarize geologic information on many different types of maps. Two common types are those that show rocks and unconsolidated materials. Maps that show rocks or named rock units are bedrock geology maps, whereas maps of unconsolidated material, such as sand, gravel, mud, and soil, are surficial geology maps. Both maps illustrate and help define the distribution of distinct types of earth materials as projected onto the land surface. Surficial geology maps show unconsolidated materials at the earth's surface, and therefore, do not illustrate the distribution of these deposits below the ground. Bedrock geology maps show rocks and rock units at the surface of the bedrock, which may not be exposed at the earth's surface. In Indiana, bedrock is exposed only in the south-central part of the state and along some major rivers. In the northern half of the state, the bedrock is in places covered by more than 400 feet of glacial till, sand, gravel, and clay.
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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.