Leona Marshall Libby was a pioneer in modern climatic research, a field that gained great impetus in the late twentieth century because of the promise it holds for predicting future climatic trends. Libby’s work led to remarkable new procedures for investigating long-term changes in precipitation and temperature and thereby greatly expanding our knowledge of past climates.
As Professor Rainer Berger writes in his foreword:
“In recent years, tree ring–based temperature data have been collected which go far beyond the records available to historians. These data can be analyzed by Fourier transforms which identify certain periodicities. . . . Climatic changes detected by tree rings have been checked against historic records. . . . The correspondence is astonishing. . . .
“At present weather forecasting is becoming more accurate for periods on the order of days, weeks, and months. Climatic prognoses have also been attempted for very long times of tens of thousands of years. But the intermediate range in the decades and centuries has so far been an enigma. It is here where tree ring thermometry plays its trump cards.
“. . . Its potential is enormous in assessing worldwide crop yields, water inventory, heating requirements, stockpiling policies, and construction planning as well as political and military prospects.”
Dendrochronology, the science of assigning precise calendar dates to annual growth rings in trees, provided accurate dates at a time when North American archaeologists had no absolute dating techniques available to guide their analyses. Time, Trees, and Prehistory examines the growth, development, application, and interpretive implications of North American archaeological tree-ring dating from 1914 to 1950.
The development of dendrochronology forced archaeologists to radically revise their understanding of the prehistoric past, compressing by nearly fifty percent the time scale of the archaeological record. Basketmaker sites, for instance, were once thought to be four thousand years old; tree-ring application demonstrated that these sites dated well into the present millennium. Classic sites in Chaco Canyon and Mesa Verde were believed occupied for nearly a thousand years, but tree-ring dates demonstrated that such sites were often built, occupied, and abandoned in just over a century. Other similar changes in temporal scale forced archaeologists to reconsider their interpretations of the rate of prehistoric cultural change, population growth, and the degree of social and political complexity in the Southwest.
Time, Trees, and Prehistory examines archaeological practices of the 1920s, 30s, and 40s and demonstrates that tree-ring dating set the stage that enabled revolutionary developments in archaeological method and theory in succeeding decades.
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