Abstract
THERE is an interesting sedimentary deposit along the Conchas River in San Miguel County, New Mexico, a few miles above the point at which the river enters Conchas Lake. The name Conchas is derived from the well preserved specimens of freshwater clam shells, class Pelecypoda, family Unionidae, which are buried at a depth of about 4 feet in the sediments. In the same area are found Indian artefacts, and in one terrace a fireplace was found buried 4.5 feet below the surface. The fireplace consisted of a horizontal arrangement of flat rocks on which were deposited pieces of charcoal. The shells and charcoal were sampled for carbon-14 dating.
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