@article {, title = {Ash-flow sheets of early Miocene and Early Pliocene age are present in the Castillo de Callalli, Arequipa department, Southern Peru}, journal = {Bolet{\'\i}n de la Sociedad Geol{\'o}gica del Per{\'u}}, volume = {95}, year = {2003}, pages = {33-38}, author = {Noble, Donald C. and Pedro A. Navarro and Luis Quispesivana and Lisa Peters and Edwin H. McKee} }