North Africa GeoNet - Internet platform for the exchange of ideas and information about geology, research and exploration in North Africa. USGS National Geologic Map Database - Searchable catalog of paper and digital geologic maps, mostly for the U.S. Maps and related data cover: geology, hazards, earth resources, geophysics, geochemistry, geochronology, paleontology, and marine geology. Geology Adirondacks Wyoming White Sands - Pictures and descriptions of geology field trips to various places around the United States. Desert Environment, Minerals & Geology - DesertUSA - About the geology of the North America deserts, including the formations, rocks, gems and minerals found there. Grand Canyon 3-D Tour - Three-dimensional geologic tour of the Grand Canyon with computer generated aerial pictures every 4 miles for the entire canyon used to illustrate the geologic narrative. Geology by Lightplane - Louis Maher's air photos of landforms and geologic features of several parts of the U.S., taken from a small aircraft in 1966. Tibet: A Virtual Field Trip - A virtual geological field trip (1996) along the eastern margin and across the Tibetan Plateau. Also includes information about culture and politics. Central Wales Ore Minerals - A virtual atlas from an ore-petrologist studying the Central Wales polymetallic vein mineralisation. Early Cretaceous Tethyan Stratigraphy - The broad objective is to build up a detailed knowledge of the Early Cretaceous stratigraphy in the Tethyan realm. The approach will be systematic through the integration of basin reference sections, basin or platform control sections, biostratigraphic data, and sequence stratigraphy. Geologic Map of the United States - 1:2,500,000 scale map viewable in Google Earth. Also provides aeronautical charts and historic topographic maps. Mono Lake: Great Basin Edge - Information on Mono Lake, California. Includes volcanic history, formation of tufa, and other information on the lake and its environs.