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Rocks and Images: Collecting RocksIntroduction: Igneous Rocks | Sedimentary Rocks | Metamorphic Rocks | LinksCollecting Rocks: To Start | Where to Find Rocks | Collecting Equipment | Housing and Enlarging a Collection | Hints for Rock Collectors - Adapted from COLLECTING ROCKS by Rachel M. Barker Starting a Collection
Identifying Rocks Many books about geology explain the identification and classification of rocks and describe the underlying geologic principles. Almost any recent general book on geology would help a rock collector. Geologic maps, which are useful guides for collecting, are also excellent identification aids. They show the distribution and extent of particular rock types or groups of rock types. Depending on size and scale, the maps may cover large or small areas. Most have brief descriptions of the rock types. Some are issued as separate publications; others are included in books. Most geologic maps are issued by public or private scientific agencies. The most prolific publisher of geologic maps in the United States is the U.S. Geological Survey (USGS). "Geologic and Water-Supply Reports and Maps, (State)," a series of booklets published by the USGS, provides a ready reference to these publications for 13 States. The booklets also list libraries in the subject State where USGS reports and maps may be consulted. These booklets are available for less than $5.00 and may be obtained from: USGS Information Services
U.S. Geological Survey
Older catalogs are available free of charge at the locations listed above. Geologic organizations of many States also publish geologic maps, as do many universities and scientific journals. Geologic maps may be located in public or university libraries. Comparing one's own specimens with those in a museum collection can help in identifying them. Most large rock collections are well labeled. Small rock collections abound in libraries, schools, public buildings, small museums, and private homes. Introduction: Igneous Rocks | Sedimentary Rocks | Metamorphic Rocks | Links
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