20 resultados con objetos digitales Muestra los resultados con objetos digitales
Growth of Pleistocene glaciers
Parte deW.O. Kupsch fonds
Growth of Pleistocene glaciers (Bray 1962, p.7).
Fault scarp cutting throuh school, Anchorage
Parte deW.O. Kupsch fonds
Fault scarp cutting throuh school, Anchorage.
Open crack, minor scarps, Anchorage
Parte deW.O. Kupsch fonds
Open crack, minor scarps, Anchorage.
Parte deW.O. Kupsch fonds
Damage to school, Anchorage.
Parte deW.O. Kupsch fonds
Damage Main Street, Anchorage.
Paleozoic tectonic framework of North America
Parte deW.O. Kupsch fonds
Paleozoic tectonic framework of North America (After Schuchert, 1923; from Krumbein and Sloss, 1963, p. 398).
Early Paleozoic tectonic framework of North America
Parte deW.O. Kupsch fonds
Early Paleozoic tectonic framework of North America, modified from Kay (1947), with adaptations from Barton (1945) and King (1950). Krumbein and Sloss, 1963, p. 407.
Landslide caused by Alaska's Good Friday Earthquake
Parte deW.O. Kupsch fonds
Landslide caused by Alaska's Good Friday Earthquake. MArch 27, 1964.
Nomencalture of tectonic elements
Parte deW.O. Kupsch fonds
Nomencalture of tectonic elements (Cady, 1950; from Krumbein and Sloss, 1963, p. 413).
Paleogeography of early Ordivician of North America
Parte deW.O. Kupsch fonds
Paleogeography of early Ordivician of North America (Kay, 1951, plate 1).
Basic unit of silicate structure
Parte deW.O. Kupsch fonds
Left: SiO sub 4 tetrahedra. Basic unit of all silicate structure. Right: Si sub 2 O sub 7 (double Tetrahedral group). In silicate structures the silicon atoms group in fourfold symmetry with oxygen. The basic unit of all silicate structure is the tetrahedron. The sorosilicates possess double tetrehedral groups.
Chain structures for amphiboles and pyroxenes
Parte deW.O. Kupsch fonds
Chain structures for amphiboles and pyroxenes (left). Silicon-oxygen tetrahedra form simple or double chains in the inosilicates by sharing oxygen atoms with neighbouring tetrahedra.
Parte deW.O. Kupsch fonds
Muscovite. Oxygen: white. Silicon: small metallic spheres in centre of white tetrahedral oxygen groups, only one or two visible. Aluminum: larger metallic spheres. Potassium: purple OH groups, or hydroxyl: blue. A phyllosilicate.
Parte deW.O. Kupsch fonds
Halite (cubo-octahedron). Sodium: yellow. Chlorine: green. The halite (and sylvite) structure is like that of the galena, and petraclase groups of minerals. One kind of ions (Cl, S, etc.) occupies the points of a face-centred cubic lattice while the other kinds of ions (Na, Pb, etc.) lie halfway between each pair of the first kind along (100) directions.
Fluorite, Westmoreland, New Hampshire. An excellent example of the octahedral cleavage fluorite
Parte deW.O. Kupsch fonds
Fluorite, Westmoreland, New Hampshire. An excellent example of the octahedral cleavage fluorite.