JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 91.229.229.129 on Thu, 12 Jun 2014 21:29:55 PM All use subject to JSTOR Terms and Conditions Recent investigations in the Casma Valley on the north-central coast of Peru have uncovered a series of circular and rectangular/square structures, each containing a central hearth associated with either four subfloor ventilation shafts or a single open ventilation trough. The structures date to the Late Preceramic period (2500-1800 B.C.) and the Initial period (1800-900 B.C.). All are small and were originally roofed with perishable materials to hold in heat and smoke from the central hearth. It seems likely that these ventilated hearths represent a coastal variant of the Kotosh Religious Tradition that has been well documented in the Peruvian Highlands. The structures probably served as ritual chambers for small groups of people, somewhat analogous to the sweathouses of various Native American groups.Investigaciones recientes en el valle de Casma en la costa norte central del Peru' han revelado una serie de estructuras circulares y rectangulares/cuadradas, cada una con un fogo'n central asociado con cuatro huecos de ventilacio'n debajo del piso o una sola canaleta de ventilacion abierta. Las estructuras datan del periodo Precera'mico Tardfo (2500-1800 a. C. ) y el periodo Inicial (1800-900 a.C.). Todas son pequenas, y originalmente estaban techadas con materiales perecederos para contener el calor y humo del fogo'n central. Es muy probable que los fogones con huecos de ventilacio'n representan una variacion costena de la Tradicio'n Religiosa Kotosh que ha sido bien documentada en la sierra del Peru'. Las estructuras probablemente servfan como camaras rituales pa ra pequenos grupos de personas, algo pa recido a los banos de vapor de varios grupos indios norteamericanos.