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Allosaurus

(Encyclopedia) Allosaurus, late Jurassic carnivorous dinosaur of the W United States. Specimens of 30 to 40 ft (9 to 12 m) have been found. It had stong hind legs, smaller…

Apatosaurus

(Encyclopedia) Apatosaurus ăp˝ətəsôr´əs, ā˝păt˝ə– [key], [Gr.,=deceptive lizard], quadruped saurischian dinosaur , estimated to be from 70 to 90 ft (21 to 27 m) in length and to…

Atlas Mountains

(Encyclopedia) Atlas Mountains, system of ranges and plateaus in NW Africa, extending c.1,500 mi (2,410 km) from SW Morocco, through N Algeria, to N Tunisia; Jebel Toubkal (13,671 ft/4,…

Stegosaurus

(Encyclopedia) Stegosaurus stĕgəsôr´əs [key] [Gr.,=roof lizard], quadriped ornithischian dinosaur of the late Jurassic period. About 29 ft 6 in (9 m) long, it had short forelegs…

Diplodocus

(Encyclopedia) Diplodocus dĭplŏd´əkəs [key] [Gr., = double beam (or rafter)], immense quadruped herbivorous dinosaur found in the late Jurassic strata of the Colorado, Utah, and…

Archaeopteryx

(Encyclopedia) Archaeopteryx är˝kēŏp´tərĭks [key] [Gr.,=primitive wing], a 150 million-year-old fossil animal first discovered in 1860 in the late Jurassic limestone of Solnhofen,…