Rocks and deposits
Solid masses that make up the earth's crust as well as accumulations of materials. Use for major rock types and unconsolidated deposits. For deposits of economic value, see related terms.
Geologic time online edition [ More info] Booklet giving general explanations of geologic time, major divisions of geologic time, relative and radiometric time scales, index fossils, and the age of the earth.
Geology of Lake Meade National Recreation Area [ More info] Site has links to Lake Mead National Recreation Area: geologic field trips, geologic history, plate tectonics, rocks and minerals, geologic time, geologic maps, and glossary.
Geology of Mojave National Preserve [ More info] Site has links to Mohave National Preserve: geologic field trips, geologic history, plate tectonics, rocks and minerals, geologic time, geologic maps, and glossary.
Geology of Sunset Crater Volcano National Monument [ More info] Site has links to Sunset Crater Volcano National Monument geologic field trips, geologic history, plate tectonics, rocks and minerals, geologic time, geologic maps, and glossary.
Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia [ More info] Rocks representing a variety of tectonic and depositional environments outcrop along the canal and towpath and reveal the geologic history of the central Appalachian region from the Mesoproterozoic to Jurassic Period.
Geology of the Devonian Marcellus Shale--Valley and Ridge province, Virginia and West Virginia--a field trip guidebook for the American Association of Petroleum Geologists Eastern Section Meeting, September 28-29, 2011 [ More info] Detailed background information with descriptions of sites and photos explaining the geology of this organic-rich shale unit that has recently become a significant source of natural gas resources.
Geology, geochemistry and geophysics of sedimentary rock-hosted gold deposits in China [ More info] Second report of a joint project with the Tianjin Geological Academy to study sedimentary rock-hosted Au deposits in China.
How do geologists date rocks? Radiometric dating! [ More info] Explanation of how geologists date rocks (to determine the ages of the Earth, fossils, mineral deposits, and other geologic events) and processes using radiometric dating techniques based on radioactive isotopes of carbon and potassium/argon.
Identification of tsunami deposits in the geologic record; developing criteria using recent tsunami deposits [ More info] Characteristics of recent tsunami deposits, with the knowledge we have about the events that caused them, give us ways to recognize ancient deposits of this type and infer characteristics of those ancient tsunamis as well.
In-place oil shale resources examined by grade in the major basins of the Green River Formation, Colorado, Utah, and Wyoming [ More info] We estimated a total of 4.285 trillion barrels of oil in-place in the oil shale of this area using a geology-based assessment methodology.
Alphabetical Index of Topics
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