FIGURE 66—GEOLOGIC MAP OF LODAISKA SITE
Overlying the bouldery gravel and the variegated alluvium is a dark-colored, sandy and silty alluvium ([Qp on the map]), 1 to 6 feet thick, that looks quite like the Piney Creek alluvium in the Denver area. Both the Piney Creek and this alluvium are of Recent age. Fossil bones were found in the alluvium at two places near the site ([A and B on the map]). At A, 1 foot below the surface, articulated bones were found; at B, a single bone was found and it was not in place, but from a plowed surface on the upland. At this locality a chert flake was found also. The bones were examined by Edward Lewis of the U. S. Geological Survey and C. B. Schultz and L. G. Tanner of the University of Nebraska State Museum and Geology Department. Their identifications are as follows:
Locality A, fragments of a vertebra, femur, epiphysis, and ribs of Bison bison (Linnaeus) of Recent age, and
Locality B, the badly weathered astragalus of a large bovid, either Bos Taurus or Bison bison (Linnaeus) of Recent age.
The unconformity at the base of the dark-colored alluvium is well exposed at the localities indicated on the map.
Fragments of charcoal were found in the alluvium 200 feet upstream from the site. This alluvium probably correlates with the pre-ceramic layers of the occupation levels at the site, which, as reported by Lewis in an accompanying paper, also contains vertebrate remains of Recent age.
The youngest deposit, a bouldery gravel confined to the present washes, is a lag concentrate of the boulders and cobbles that are left by washing out finer grained sediments from the Pleistocene deposits. This deposit, and the arroyo-cutting with which it is associated, probably developed throughout the period of the ceramic levels.
REFERENCE CITED