The American Journal of Science, Band 252

alaskite albite alluvial terrace alluvium analysis atolls axis basin beds bioherm bomb breccia Bull buried soils calcite carbon channel chemical clay composition correlation crater Creek Cryptolithus crystals curves cylinder Cynthiana deformation deposits depth developed dolomite epidote erosion evidence Excursion Inlet faults feet feldspar figure flow fluidized Foraminifera formation fragments Geol Geological Survey geologists Geology geyser glacial Glacier glaucophane gliding grains granite gumbotil horizon Hot Springs impactite indicated Iowa Jour kaolinite Lake layers limestone loess marble mass material maximum meanders measurements metamorphic miles minerals muskeg nepheline observed occur orientation origin percent perlite Planosols Pleistocene Podzolic Podzolic soils pollen present quartz radon radon content reef region result River rocks samples sand sandstone schists sea level sedimentary sediments shale silt slope specimens sphene stream structure surface temperature thermal thickness tion upper valley bends volcanic volumometer wind York zone