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. being placed where sandstone becomes the prominent rock <br /> type. <br /> The upper limit of the IIesaverde and the <br /> indistinct upper boundary of the Paonia are entirely non- <br /> marine . The upper , undifferentiated Williams Fork consists <br /> of upper deltaic-plain and flood-plain deposits , characteristic <br /> of the prograding deltaic complex. <br /> Sandstone bodies are heavily cross-bedded and <br /> show a predominantly east-southeast current flow direction, <br /> although other directions are indicated as well . Fossils . <br /> are limited to poorly preserved plant impressions . (Collins , <br /> 1977) <br /> • <br /> 26 <br />