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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...

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...

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 ...

Pachycephalosaurus

(Encyclopedia)Pachycephalosaurus păkˌĭsĕfˌəlōsôrˈəs [key] [Gr., = thick-headed lizard], bipedal herbivorous dinosaur of the late Cretaceous period, approximately 68–65 million years ago. Its disting...

Spokan

(Encyclopedia)Spokan or Spokane both: spōkănˈ [key], Native North Americans whose language belongs to the Salishan branch of the Algonquian-Wakashan linguistic stock (see Native American languages). In the early...

corundum

(Encyclopedia)corundum kərŭnˈdəm [key], mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system and in mass...