In a nearby location he recovered human bones from the stratum that contained Pleistocene fossils .
The following year Sellards conducted his own excavations at the site , recovering an engraved mammoth tusk and a bird bone with marks possibly made by humans .
In a nearby location Sellards recovered human bones from the stratum that contained Pleistocene fossils .
The following year Sellards conducted his own excavations at the site , recovering an engraved mammoth tusk and a bird bone with marks possibly made by humans .