Willey's groundbreaking study stimulated the work of a number of subsequent archaeologists in the valley. From 1992-1998 Dr. Thomas A. Zoubek embarked on a study of the earliest mid and upper valley sites in Viru concentrating specifically at the sites of Huaca El Gallo/La Gallina in the El Nino Quebrada. These excavations and later ones in the Susanga region completely redefined our knowledge of the earliest agricultural societies in the valley and resulted in the discovery of the earliest ceramics found in coastal Peru that have been dated to c.2400 BCE.
Willey, G. R. (1953): Prehistoric settlement patterns in the Virù Valley, Peru. Bureau of American Ethnology Bulletin 155. Smithsonian Institution, Washington, DC.