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Flathead Lake

(Encyclopedia) Flathead Lake, 197 sq mi (510 sq km), 30 mi (48 km) long, NW Mont.; largest natural lake in Montana. Formed by the glacial damming of the Flathead River, which flows through it from…

Great Glen

(Encyclopedia) Great Glen or Glen More, valley, 60 mi (97 km) long, Highland, N central Scotland, extending from Moray Firth SW to Loch Linnhe. It was formed by a fault in the earth's surface. Loch…

Logan, Mount

(Encyclopedia) Logan, Mount, 19,551 ft (5,959 m) high, in Kluane National Park, extreme SW Yukon, Canada, just E of Alaska; highest mountain in Canada and second highest in North America. One of the…

Buckland, William

(Encyclopedia) Buckland, William, 1784–1856, English geologist. He was dean of Westminster from 1845. First to note in England the action of glacial ice on rocks, he did much to bring physical and…

Bouvet Island

(Encyclopedia) Bouvet IslandBouvet Islandb&oomacr;vāˈ [key], uninhabited volcanic island, c.58 sq mi (150 sq km), S Atlantic Ocean, about 1,600 mi (2,576 km) SW of the Cape of Good Hope. A…

kettle

(Encyclopedia) kettle, oval depression found in glacial moraines, which are landforms made up of rock debris. When a glacier melts and draws away from an area, a block of ice may break off and be…

Neolithic period

(Encyclopedia) Neolithic period or New Stone Age. The term neolithic is used, especially in archaeology and anthropology, to designate a stage of cultural evolution or technological development…

Jurassic period

(Encyclopedia) Jurassic periodJurassic periodjərăsˈĭk [key] [from the Jura Mts.], second period of the Mesozoic era of geologic time, lasting from 213 to 144 million years ago. At the start of the…

Devonian period

(Encyclopedia) Devonian periodDevonian perioddĭvōˈnēən [key], fourth period of the Paleozoic era of geologic time between 408 and 360 million years ago (see Geologic Timescale, tablegeologic…