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boulder, in geology

(Encyclopedia) boulder, large rock fragment formed by detachment from its parent consolidated rock by weathering and erosion. In engineering and geology, especially in the United States, the term is…

mesa, in geology

(Encyclopedia) mesamesamāˈsə [key] [Span.,=table], name given in the SW United States to a small, isolated tableland or a flat-topped hill. Two or more of the sides are steep and usually…

batholith

(Encyclopedia) batholith, enormous mass of intrusive igneous rock, that is, rock made of once-molten material that has solidified below the earth's surface (see rock). Batholiths usually are granitic…

Guerrero

(Encyclopedia) Guerrero, state, 24,887 sq mi (64,457 sq km), S Mexico, on the Pacific Ocean. The capital is Chilpancingo. Dominated by the Sierra Madre…

Joplin, Janis

(Encyclopedia) Joplin, JanisJoplin, Janisjŏpˈlĭn [key], 1943–70, American blues-rock singer, b. Port Arthur, Tex. After dropping out of college (1963) and singing folk rock in Texas clubs, she moved…

Precambrian

(Encyclopedia) Precambrian, name of a major division of geologic time (see Geologic Timescale, tablegeologic timescale, table), from c.5 billion to 570 million years ago. It is now usually divided…

dolomite

(Encyclopedia) dolomitedolomitedōˈləmītˌ, dŏlˈə– [key]. 1 Mineral, calcium magnesium carbonate, CaMg (CO3)2. It is commonly crystalline and is white, gray, brown, or reddish in color with a vitreous…

Chimney Rock National Monument

(Encyclopedia) Chimney Rock National Monument, 4,726 acres (1,913 hectares), SW Colorado; est. 2012. Located in San Juan National Forest, it is bordered by the Southern Ute reservation. Within the…

Sela

(Encyclopedia) Sela or SelahSelasēˈlə [key] [Heb.,=rock], in the Bible, unidentified town, S of the Dead Sea. Amaziah captured it and renamed it Joktheel. Some identify Sela with Petra. Sela in the…

Beloit

(Encyclopedia) Beloit Beloit bəˈloit [key], city (2020 pop. 36,657), Rock co., S Wis., on the Rock River; inc…