tuffaceous medium

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Geology of the Australian Capital Territory — Australia grew around three fused pieces of very ancient continental crust (cratons). The geology of the Australian Capital Territory includes rocks dating from the Ordovician around 480 million years ago, whilst most rocks are from the Silurian … Wikipedia
Mazatlán — For the dredger laid down as SS Mazatlan, see SS Tuxpam. Mazatlán … Wikipedia
Easter Island — an island in the S Pacific, W of and belonging to Chile. ab. 45 sq. mi. (117 sq. km): gigantic statues. Also called Rapa Nui. Spanish, Isla de Pascua. * * * Spanish Isla de Pascua native Rapa Nui Island (pop., 2000 est.: 3,618), eastern Pacific… … Universalium
Marcellus Formation — Stratigraphic range: Middle Devonian … Wikipedia
Pamirs — /pah mearz /, n. the, a mountainous region in central Asia, largely in Tajikistan, where the Hindu Kush, Tien Shan, and Himalaya mountain ranges converge: highest peaks, ab. 25,000 ft. (7600 m). Also called Pamir. * * * High mountain region,… … Universalium
Geology of Taiwan — Taiwan is active geologically, showing plate boundary tectonics. The island formed at the junction of the Luzon Volcanic Arc (吕宋岛火山弧) and the Ryukyu Volcanic Arc (琉球火山弧). Subduction changes direction at Taiwan. South of the island, the Philippine … Wikipedia

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