front cover of Canal Irrigation in Prehistoric Mexico
Canal Irrigation in Prehistoric Mexico
The Sequence of Technological Change
By William E. Doolittle
University of Texas Press, 1990

Prehistoric farmers in Mexico invented irrigation, developed it into a science, and used it widely. Indeed, many of the canal systems still in use in Mexico today were originally begun well before the discovery of the New World. In this comprehensive study, William E. Doolittle synthesizes and extensively analyzes all that is currently known about the development and use of irrigation technology in prehistoric Mexico from about 1200 B.C. until the Spanish conquest in the sixteenth century A.D.

Unlike authors of previous studies who have focused on the political, economic, and social implications of irrigation, Doolittle considers it in a developmental context. He examines virtually all the known systems, from small canals that diverted runoff from ephemeral mountain streams to elaborate networks that involved numerous large canals to irrigate broad valley floors with water from perennial rivers. Throughout the discussion, he gives special emphasis to the technological elaborations that distinguish each system from its predecessors. He also traces the spread of canal technology into and through different ecological settings.

This research substantially clarifies the relationship between irrigation technology in Mexico and the American Southwest and argues persuasively that much of the technology that has been attributed to the Spaniards was actually developed in Mexico by indigenous people. These findings will be important not only for archaeologists working in this area but also for geographers, historians, and engineers interested in agriculture, technology, and arid lands.

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front cover of Pre-Hispanic Occupance in the Valley of Sonora, Mexico
Pre-Hispanic Occupance in the Valley of Sonora, Mexico
Archaeological Confirmations of Early Spanish Reports
William E. Doolittle
University of Arizona Press, 1988
“[This book] presents a great amount of new information for a poorly known or understood area of northern Mexico, and provides a pleasant integration of the methods and theories of anthropology, geography, and ecology in a well-organized manner. . . . This report represents an important contribution to our understanding of cultural evolution and environmental adaptation in the Valley of Sonora and lays a strong framework for future studies and discussions.”—Journal of Arizona History
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front cover of The Safford Valley Grids
The Safford Valley Grids
Prehistoric Cultivation in the Southern Arizona Desert
William E. Doolittle
University of Arizona Press, 2004
Crisscrossing Pleistocene terrace tops and overlooking the Gila River in southeastern Arizona are acres and acres of rock alignments that have perplexed archaeologists for a century. Well known but poorly understood, these features have long been considered agricultural, but exactly what was cultivated, how, and why remained a mystery. Now we know. Drawing on the talents of a team of scholars representing various disciplines, including geology, soil science, remote sensing, geographical information sciences (GISc), hydrology, botany, palynology, and archaeology, the editors of this volume explain when and why the grids were built.

Between A.D. 750 and 1385, people gathered rocks from the tops of the terraces and rearranged them in grids of varying size and shape, averaging about 4 meters to 5 meters square. The grids captured rainfall and water accumulated under the rocks forming the grids. Agave was planted among the rocks, providing a dietary supplement to the maize and beans that were irrigated on the nearby bottom land, a survival crop when the staple crops failed, and possibly a trade commodity when yields were high. Stunning photographs by Adriel Heisey convey the vastness of the grids across the landscape.
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