spatial distribution, variability, and chronology of the extensive raised fields on the Moxos tropical savannas. This work was based on initial observations made by William Denevan in the 1960s about this prehistoric agricultural technique on the Moxos plains, and similar work has been conducted by Marcos Michel on the Beni plains. Heiko Prümersand his team have excavated a series of occupational mounds in the tropical savannas of Santa Cruz and Beni in order to identify different archaeological cultures and provide a chronological sequence for the region (Prümers and Winkler 1997).

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Incallajta Inca complex in the Cochabamba valleys

(from Werner Guttentag, Incallajta y la Conquista Incaica del Collasuyu [La Paz-Cochabamba: Los Amigos del Libro, 1998])

In the southern highlands of Potosí, Patrice Lecoq (1997), in cooperation with the Archaeological Museum of Cochabamba and INAR, has conducted extensive surveys and settlement studies related to Altiplanic post-Tiwanaku cultures during the late intermediate and Inca periods in the inter-Salar region of Uyuni-Coypasa (Potosí and Oruro). In the intermediate Cochabamba valleys, János Gyarmati and András Varga (1999) have documented and excavated different areas of Incarracay, an important Inca installation in the valleys, and Cotapachi, an extensive Inca storage area. Donald Brockington (1995) has studied and documented the formative period in the southeastern Cochabamba valleys, and Marianne Vetters and Alvaro Higueras (1994) have explored different areas of these multiethnic valleys to understand the settlement pattern distribution and type of interaction established between local populations and Tiwanaku.

In the southern valleys, efforts to identify and document local prehistoric manifestations are being conducted by the Bolivians in the region inhabited by the Uruquillas (Rivera Casanovas 1998) and in the regions of Oroncota and Monteagudo inhabited by the Yamparas, Incas, and Chiriguanos (Alconini M. 1998). Martti Pärssinnen has worked in Chuquisaca, in regions also inhabited by the Yamparas, in order to define the nature of the Inca impact by combining ethnohistorical and archaeological sources. Additionally, John Janusek has conducted studies related to settlement pattern and prehistoric household economy in the region of