Now showing items 1-10 of 14
Ecology and paleoecology of marine invertebrate communities in calcareous substrates, Northeast Quintana Roo, Mexico
A survey of benthic communities in the vicinity of Isla Cancun and Isla Contoy, Territory of Quintana Roo, Mexico, demonstrates that invertebrate death assemblages (i.e., future fossil assemblages) in this region reflect ...
Deposition and diagenesis of the Mississippian Lodgepole Formation, central Montana
The lower Mississippian Lodgepole Formation is exposed in central Montana in the anticlines which form the Big Snowy and Little Belt Mountains. Four sections averaging 130 feet in length were measured at the base of the ...
Petrology and structure of the Ivanpah Mountains area, California
tn the Ivanpah Mountains area of southeastern California may be seen the intersection of the north west-southeast trend of the late Mesozoic Sevier orogenic belt of westward directed thrust faults and a similar unnamed ...
Origin and silica-carbonate relations of cherts of the Upper Cretaceous of Venezuela
Petrographic and chemical studies were made on the black cherts of the San Antonio formation (eastern Venezuela) and of the Ftanita del Tachira member (western Venezuela), both of Upper Cretaceous age. The AI2O3, Fe2 ...