Abstracts of North American Geology

Absolute age America analysis aquifer Assoc Author's abstract basalt basin Brachiopoda British Columbia California Canada Canada Geol Canada Geological Survey Canadian Canyon carbonate Cenozoic clay Colorado composition conodonts correlation County Creek Cretaceous crystals deposits Devonian Dissert dolomite Donald earthquake Economic geology fault fauna field Foraminifera Formation fossil genesis Geochemistry Geomorphology glacial glacier ground water ground-water Group Hudson Bay illus Internat isotope James John Jour Lake Limestone magnetic marine metamorphic meteorites method Mexico Mineralogy Miocene Mississippian Mountains Nevada North northern Northwest Territories Ocean Ontario Ordovician paleomagnetic Paleontology Paleozoic Pennsylvanian percent Permian Petrology Pleistocene Precambrian quadrangle Quaternary Quebec range ratios region Research River Robert rocks samples sand Sandstone Sedimentary petrology sediments seismic Shale soil southern southwestern species stratigraphy Structural geology studies surface Survey Geophysics Paper tables tectonic temperature Tertiary Texas tion U.S. Geol upper Valley velocity volcanic western William zone