British Geological Expedition. Charles P. Booth and A. J. Ravenscroft made geological and glaciological studies from the end of May to mid-September in the southern Peruvian Andes. They explored the Cusipata, Tantamco, Ausangate, Nudo Huaynacapac, Chichicapac, and Allincapac regions, from Macusani, and returned to Sicuani through the Aricona and Quenemari groups. They ended their work in the glaciers of the Apurimac valley.