South America Surficial Maps Quebradas Ullullo and Santiago Coropuna LGM snowline   Surface Exposure Ages Nevado Coropuna Androscoggin   Antarctic Maps Caloplaca Hills Cox Peaks Dry Valleys Seal Map La Gorce Mountains Mt. Walshe Polygon Spur Quartz Hills Taylor Ridge Thanksgiving Point Salmon Valley Miers Valley Marshall Valley   Radiocarbon data Dry Valleys Delta Radiocarbon