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Paleozoic era

(Encyclopedia) Paleozoic era pā˝lēəzō´ĭk [key], a major division (era) of geologic time (see Geologic Timescale , table) occurring between 570 to 240 million years ago. It is…

Siberian Platform

(Encyclopedia) Siberian Platform or Angara Shield, large, geologically stable area of Precambrian rocks, N Asia, comprising much of Siberia, Russia. It is bounded, in general, on…

Permian period

(Encyclopedia) Permian period pûr´mēən [key] [from Perm, Russia], sixth and last period of the Paleozoic era (see Geologic Timescale , table) from 250 to 290 million years…

Logan, Sir William Edmond

(Encyclopedia) Logan, Sir William Edmond, 1798–1875, Canadian geologist. Educated in England, he managed (1831–38) coal mines and a copper smelter in Wales. In addition to making…

Phoronida

(Encyclopedia) Phoronida fərŏn´ədə [key], small phylum of slender, wormlike marine tube-dwellers, typically found in temperate, shallow seas. About 10 species are known. Although the…

White Mountains

(Encyclopedia) White Mountains, part of the Appalachian system, N N.H. and SW Maine, rising to 6,288 ft (1,917 m) at Mt. Washington in the Presidential Range and to 5,249 ft (1,600 m)…

Triassic period

(Encyclopedia) Triassic period trīăs´ĭk [key], first period of the Mesozoic era of geologic time (see Geologic Timescale , table) from 205 to 250 million years ago.…

cephalopod

(Encyclopedia) cephalopod sĕf´ələpŏd˝ [key], member of the class Cephalopoda, the most highly organized group of mollusks (phylum Mollusca ), and including the squids…

trilobite

(Encyclopedia) trilobite trī´ləbīt˝ [key], subphylum of the phylum Arthropoda that includes a large group of extinct marine animals that were abundant in the Paleozoic era. They…

Karroo

(Encyclopedia) Karroo or Karoo both: kəro͞o´, kä– [key], the semiarid plateaus of South Africa. The Little Karroo, in Western Cape, is located N of the Langeberg and…