1. Conodont color alteration index (CAI) map and conodont-based age determinations for the Winchester 30ʹ x 60ʹ quadrangle and adjacent area, Virginia, West Virginia, and Maryland Yale Public content 1994. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Virginia, Winchester Region, West Virginia, and Maryland.