Correction appended May 27, 2009 To preserve the prehistoric bones at Waco Mammoth Site, Cotera+Reed Architects has strived to intertwine the firm’s creative vision with the immutable realities of sunlight, Central Texas heat, and the rigors of scientific preservation. The Austin-based firm has designed an 8,400-square-foot shelter for the dig site that will be open to the public. It will be one of fewer than a dozen buildings in the United States that enclose prehistoric remains in situ—that is, located where they were first discovered. Portions of at least 25 Columbian mammoth skeletons, dating back some 68,000 years, have been