Loess Formations of the Mississippi Valley

摘要: The loess deposits of the Mississippi Valley area are widespread and have been extensively studied. In upper valley they definite stratigraphic relationships to drift sheets. From these known a sequence, their ages been, in main, closely determined. They show an eolian genetic relationship source areas by thickness, texture, structure, topographic position, percentage composition carbonates. Their origin is also indicated faunal and, places, floral assemblages. Some reflect climatic conditions under which accumulated rate deposition with respect solution Where carry plant fossils, nature vegetation was growing on surface at time recorded. sequence that prevails can be unmistakably traced into lower beyond Natchez. Mississip...