Part one of term paper
Abstract The sediments and the trace fossils of the record the advance passage of a major eolian sand sea. Both invertebrate and vertebrate traces indicate that the substrate was, was for the most part, very dry though it was clear that light rainfall or dew periodically moistened the dune surfaces. Although we know that the erg was characte ...

Part two of term paper
... in the Grand Canyon. Very large dunes are visible from great distances throughout the area. Ironically, few geologists, except for McKee and Reiche, have studied the Coconino. The early work of these two, however, correctly identified the eolian origin of the Coconino. These Sahara-like dunes were part of an enormous desert that once extended north into Montana. During the last ten years, a number of studies on modern and ancient sand seas, or ergs, have increased greatly our understanding of eolia ...