Japanese archaeologist who worked in Peru, excavating at Kotosh near Huanuco. A cultural peak was reached in the valleys of Pacasmayo, Chicama, and Moche on the northern Peruvian coast. A large proportion of this area has been grouped by archaeologists into a Moche culture, although some of the territory encompassed by these valleys was not part of the polity called Moche. Izumi referred to this kind of control as horizontally discontinuous territoriality.