LOTHIAN, Md. — For weeks, Al Luckenbach puzzled over the bones surfacing in the pit atop the Patuxent River bluff here. They were hard to identify: fragments and shattered splinters, unlike the intact animal bones heaped in the nearly 9,000-year-old feast site down the hill. [cannot post pics from NY Times] A case of ornamental bones found at the Pig Point site, at what may have been a regional mortuary. Then the scrape of a trowel tip uncovered a human tooth in the dirt among the crushed pottery and broken spearheads. Two more followed, and a startling realization emerged with...