Now showing items 31-40 of 317
THE PETROLOGY AND GEOCHEMISTRY OF HIGH CASCADE VOLCANICS IN SOUTHERN WASHINGTON: MOUNT ST. HELENS VOLCANO AND THE INDIAN HEAVEN BASALT FIELD (TRACE ELEMENT, ISOTOPES, MINERALOGY)
Mount St. Helens volcano (Washington, USA) has been characterized by four eruptive periods during the last 2200 years. Eruptive products include a wide spectrum of rock types including basaltic to andesitic lavas, andesitic ...
THE LOWER ORDOVICIAN MASCOT FORMATION, UPPER KNOX GROUP, IN NORTH CENTRAL TENNESSEE. PART I: PALEOENVIRONMENTAL HISTORY. PART II: DOLOMITIZATION AND PALEOHYDRAULIC HISTORY
Part I. Petrographic examination of Lower Ordovician limestone and dolomite fabrics indicates that the sedimentary column in central Tennessee reflects multiple seaward progradation episodes of peritidal sediments across ...
ANTARCTIC GLACIAL CHRONOLOGY REFLECTED IN THE OLIGOCENE THROUGH PLIOCENE SEDIMENTARY SECTION IN THE ROSS SEA
Over 24% of the ice surface area covering East and West Antarctica drains into the Ross Sea and supplies the Ross Ice Shelf. The dominant proportion of this ice originates from the West Antarctic subcontinent. Thus, any ...
Geologic evolution of the Burgos Basin, northeastern Mexico
The Burgos Basin in northeastern Mexico has been the site of interaction of the Cordilleran thrust and fold belt of western North America with the passive margin of the Gulf of Mexico. The primary tectonic episodes in this ...