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Olduvai Gorge

(Encyclopedia)Olduvai Gorge ōlˈdəwāˌ, –vāˌ [key], a feature of the E African Rift Valley in Tanzania. Erosional processes have exposed geological strata in the gorge dating to the lower Pleistocene epoch, ...

Leakey, Mary Douglas

(Encyclopedia)Leakey, Mary Douglas, 1913–96, British archaeologist, b. London as Mary Douglas Nicol; wife of Louis Leakey and mother of Richard Leakey. She had little formal education, but a fascination with arch...

Royal Gorge

(Encyclopedia)Royal Gorge, 10 mi (16 km) long, narrow canyon cut by the Arkansas River, S central Colo., often called the Grand Canyon of the Arkansas. The gorge was discovered in 1806 by an expedition led by U.S. ...

Leakey, Louis Seymour Bazett

(Encyclopedia)Leakey, Louis Seymour Bazett băzˈət, lēˈkē [key], 1903–72, British archaeologist and anthropologist of E Africa, b. Kabete, Kenya; father of Richard Leakey. His fossil discoveries in E Africa ...

Flaming Gorge Dam

(Encyclopedia)Flaming Gorge Dam, in a deep canyon of the Green River, NE Utah; built 1958–63 by the U.S. Bureau of Reclamation as a major unit in the Colorado River storage project. The dam regulates the flow of ...

Ngorongoro Crater

(Encyclopedia)Ngorongoro Crater, caldera in the Great Rift Valley, Arusha region, N Tanzania. It is one of the world's largest unbroken volcanic calderas, created in an eruption some 3 million years ago. The calder...

Tobias, Philip Valentine

(Encyclopedia)Tobias, Philip Valentine, 1925–2012, South African paleoanthropologist, b. Durban. He graduated from the Univ. of Witwatersrand (Ph.D., 1953) and taught there for five decades. Tobias entered paleoa...

New River Gorge National River

(Encyclopedia)New River Gorge National River: see National Parks and Monuments (table)national parks and monuments (table). ...

Ausable Chasm

(Encyclopedia)Ausable Chasm ôsāˈbəl [key], gorge, 2 mi (3.2 km) long, from 20 to 50 ft (6–15 m) wide, from 100 to 200 ft (30–61 m) deep, NE N.Y. The chasm, with its rapids, waterfalls, and curious rock form...

Via Mala

(Encyclopedia)Via Mala vēˈä mäˈlä [key], narrow gorge of the Hinterrhein River, a headstream of the Rhine, c.31⁄2 mi (6 km) long, Grisons canton, E Switzerland. One of the most wild and picturesque gorges i...