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Deinonychus

(Encyclopedia)Deinonychus dīˌnənīˈkəs [key] [Gr.,=terrible claw], swift bipedal carnivorous dinosaur of the early Cretaceous period, approximately 119–93 million years ago. Fossil specimens have been discov...

monazite

(Encyclopedia)monazite mŏnˈəzīt [key], yellow to reddish-brown natural phosphate of the rare earths, mainly the cerium and lanthanum metals, usually with some thorium. Yttrium, calcium, iron, and silica are fre...

Little Bighorn

(Encyclopedia)Little Bighorn, river, c.90 mi (145 km) long, rising in the Bighorn Mts., N Wyo., and flowing north to join the Bighorn River in S Mont. On June 25–26, 1876, Sioux and Cheyenne warriors defeated the...

Walsh, Thomas James

(Encyclopedia)Walsh, Thomas James wôlsh [key], 1859–1933, American political leader, b. Two Rivers, Wis. A lawyer, he was Democratic Senator from Montana from 1913 until his death. Walsh helped write the Eightee...

talc

(Encyclopedia)talc, mineral ranging in color from white through various shades of gray and green to the red and brown of impure specimens, translucent to opaque, and having a greasy, soapy feel. It is a hydrous sil...

Ankylosaurus

(Encyclopedia)Ankylosaurus ănˌkələsôrˈəs [key], [Gr.,=crooked lizard], genus of heavily armored, herbivorous quadripedal dinosaurs, the best known of which is the species A. magniventris, the largest and hea...

Great Falls

(Encyclopedia)Great Falls, city (2020 pop. 60,442), seat of Cascade co., N central Mont., second largest city in the state, at the confluence of the Missouri and Sun ...

Grinnell, George Bird

(Encyclopedia)Grinnell, George Bird grənĕlˈ [key], 1849–1938, American naturalist and student of Native American life, b. Brooklyn, N.Y., grad. Yale (B.A., 1870; Ph.D., 1880). He accompanied Custer's Black Hil...

Folsom culture

(Encyclopedia)Folsom culture fŏlˈsəm, fŭlˈ– [key], a group of Paleo-Indians (see Americas, antiquity and prehistory of the) known through artifacts first excavated (1926) near Folsom, E of Raton, N.Mex. The ...

Mullan, John

(Encyclopedia)Mullan, John, 1830–1909, American army officer and pioneer road builder, b. Norfolk, Va., grad. St John's Colllege, 1847, West Point, 1852. He was one of the chief aides of General I. I. Stevens in ...