H.E. Malde
1960
<p><span>Artifacts related to the Cody complex occur in medium-grained sand that is spread as a blanket eolian deposit a few feet thick in the </span><span class="ScopusTermHighlight">Claypool</span><span> </span><span class="ScopusTermHighlight">site</span><span> area, Washington County, </span><span class="ScopusTermHighlight">Colorado</span><span>. The artifact-bearing sand lacks noticeable dunal topography and lies unconformably on marl of Yarmouth </span><span class="ScopusTermHighlight">age</span><span> and on waterlaid coarse sand and fine gravel of Kansan </span><span class="ScopusTermHighlight">age</span><span> that underlie the marl. The deposits underlying the artifact-bearing sand are much too old to date the artifacts precisely, but the physical characteristics of the artifact-bearing sand suggest that it was deposited under conditions cool and dry, rather than warm and dry, possibly during retreat of Valders ice that began about 10,000 years ago. A moderately mature Brown Soil about 5 feet thick developed on the sand, possibly about 7000 to 5000 years ago during a moist phase of the Thermal Maximum. Thus, the artifacts are possibly 10,000 to 7000 years old. Deposits which overlie the artifact-bearing sand reflect several episodes of erosion and sedimentation that are inferred to represent climatic changes.</span></p>
application/pdf
10.2307/276202
en
Society for American Archaeology
Geological age of the Claypool site, northeastern Colorado
article