NEW YORK, Nov. 16 -- Columbia University issued the following news: * * * A graduate of Columbia College took part in the dig, which found evidence that female leaders in ancient Peru had more authority than known. * * * By Christopher D. Shea Early this past summer, at an archaeological site about 250 miles north of Lima, Peru, Columbia art history and archaeology professor Lisa Trever and her longtime collaborators watched intensely as a team of trained conservators on their project metic  more