@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}
}