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Late Quaternary Climates in Arizona

Published online by Cambridge University Press:  20 January 2017

Ernst Antevs
Ernst Antevs*
Affiliation:
The Corral, Globe, Arizona
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Abstract

This study makes a comparative evaluation of geological and biological evidence, on the one hand, and of plant pollen data, on the other, bearing on late Quaternary climates in southeastern Arizona. The findings support the conclusions based on the former and reject the contrary claims based on pollen by Martin, Schoenwetter, and Arms. The increase of pine pollen in the Cochise-Sulphur Spring and the Cochise-Cazador beds at Double Adobe from a few per cent to 28% was much too sudden to be accounted for by the spread of pine from the mountains to Double Adobe, and does not prove a change of the climate from arid to subhumid. The beds themselves indicate a subhumid climate throughout. The low frequency of pine may be due to such causes as scanty production, decomposition, and failure of the pollen to settle in flowing water.

No pollen data are at hand from the mid-postpluvial or Altithermal age of erosion. The preceding and the succeeding beds have long been referred by Antevs to the pluvial/postpluvial transition and to the relatively moist early Medithermal, respectively. The most typical features of the age, arroyo cutting and accumulation of caliche, are most competently explained by a long sharp drought. There seems to be no evidence for the view of Martin and associates that the Altithermal was an age of intense summer precipitation.

The entire synthetic postpluvial pollen profile is alternately dominated by composites and chenopods-amaranths. The last shift to chenopods-amaranths occurred at times ranging from about 4000 years ago to the 19th century. The dominations are apparently controlled by unknown edaphic conditions and are therefore of little or no use for correlation, dating, or climatic conclusions. Still, because of their great numbers, these pollens together with pine pollen are used as the main basis for the division into pollen zones. This leads to incorrect dating of Medithermal deposits and to disregard of documented arroyo erosions and droughts. Schulman's finding, that the radial growth of the ponderosa (yellow) pine, which is completed by the end of July, shows best agreement with the October-July precipitation, implies that the ring width is in accord with some 75 to 80% of the annual rainfall. Thus normally a narrow ring means deficient rainfall. The Great Drought of the 1200's did exist and caused arroyo erosion.

Type
Research Article
Information
American Antiquity , Volume 28 , Issue 2 , October 1962 , pp. 193 - 198
Copyright
Copyright © The Society for American Archaeology 1962

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References

Albritton, C. C. and Bryan, Kirk 1939 Quaternary Stratigraphy in the Davis Mountains, Trans-Pecos Texas. Bulletin of the Geological Society of America, Vol. 50, pp. 1423–74. New York.Google Scholar
Antevs, Ernst 1952 Arroyo-cutting and Filling. Journal of Geology, Vol. 60, pp. 375–85. Chicago.Google Scholar
Antevs, Ernst 1955 Geologic-Climatic Dating in the West. American Antiquity, Vol. 20, No. 4, pp. 317–35. Salt Lake City.Google Scholar
Antevs, Ernst 1959 Geological Age of the Lehner Mammoth Site. American Antiquity, Vol. 25, No. 1, pp. 31–34. Salt Lake City.Google Scholar
Antevs, Ernst 1962 Geology and Age of the Cochise Culture. MS.Google Scholar
Bailey, R. W. 1941 Land Erosion — Normal and Accelerated — in the Semi-arid West. American Geophysical Union, Transactions, Ft. 2, pp. 240–50. Washington.Google Scholar
Brooks, C. E. P. 1949 Climate Through the Ages. Ernest Benn, London.Google Scholar
Bryan, Kirk and Albritton, C. C. 1943 Soil Phenomena as Evidence of Climatic Changes. American ]oumal of Science, Vol. 241, pp. 469–90. New Haven.Google Scholar
Buechner, H. K. and Dawkins, H. C. 1961 Vegetation Change Induced by Elephants and Fire in Murchison Falls National Park, Uganda. Ecology, Vol. 42, pp. 752–66. Durham.Google Scholar
Darling, F. F. 1960 Wild Life in an African Territory, Northern Rhodesia. Oxford University Press, London, New York, and Toronto. Reviewed in Ecology, Vol. 42, 1961, pp. 845–46.Google Scholar
Hack, J. T. 1942 The Changing Physical Environment of the Hopi Indians of Arizona. Peabody Museum Papers, Harvard University, Vol. 35, No. 1. Cambridge.Google Scholar
Judson, Sheldon 1953 Geology of the San Jon Site, Eastern New Mexico. Smithsonian Miscellaneous Collections, Vol. 121, No. 1. Washington.Google Scholar
Jurwitz, L. R. 1954 Rainfall in Arizona. Arizona Highways, July 1954, pp. 6–15. Phoenix.Google Scholar
Libby, W. F. 1955 Radiocarbon Dating, 2nd edition. University of Chicago Press, Chicago.Google Scholar
Martin, P. S., Schoenwetter, James and Arms, B. C. 1961 Southwestern Palynology and Prehistory: The Last 10,000 Years. Geochronology Laboratories, University of Arizona, Tucson.Google Scholar
O'brien, Brian 1961 Elephants are Human — Almost. Reader's Digest, June, 1961, pp. 174–80. Pleasantville, N.Y. Google Scholar
Sayles, E. B. and Antevs, Ernst 1941 The Cochise Culture. Medallion Papers, No. 29. Globe, Ariz.Google Scholar
Schulman, Edmund 1956 Dendroclimatic Changes in Semiarid America. University of Arizona Press, Tucson.Google Scholar
Smith, H. V. 1956 The Climate of Arizona. Arizona Agricultural Experiment Station, Bulletin No. 279. Tucson.Google Scholar
Wallén, C. C. 1955 Some Characteristics of Precipitation in Mexico. Geografiska Annaler, Vol. 37, pp. 51–85. Stockholm.Google Scholar