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    Late Pleistocene and recent chronologies of Playa lakes in Arizona and New Mexico

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    Author
    Long, Austin
    Issue Date
    1966
    Keywords
    Hydrology.
    Geology, Stratigraphic -- Pleistocene.
    Geology -- Arizona -- Cochise County.
    Playas -- Arizona.
    Committee Chair
    Damon, Paul E.
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    A stratigraphic radiocarbon study at the Wilicox Playa and vicinity in Cochise County, southeastern Arizona has revealed a sedimentary sequence reflecting the lake level chronology of ancient Lake Cochise. The lower green clay was deposited in a lake at least 30 miles long from before 30,000 years ago until about 13,000 years ago. A marl formation which began depositing about 25,000 years ago and continued until the lake diminishe to about its present state 13,000 years ago, indicates a warm, moist climate at that time. The period from 13,000 B.P. (before present) and 11,000 B.P. was one of alluvial deposition north of the playa and channel cutting east of the playa. An upper green clay, 6 to 8 inches thick, represented the final phase of Lake Cochise, lasting from 11,500 B.P. until 10,500 B.P. A thin marl layer was deposited during this phase, indicating warm moist conditions again. The lake rapidly receded, some playa sediments deflated from the surface, and dunes formed north of the playa. Preliminary studies of two playas near Lordsburg, New Mexico and one at the San Augustin Plains, New Mexico, indicate these fluctuations were responding to a general climate change rather than isolated tectonic disturbances. The climate chronology concluded from this study is consistent with known climatic variations in the world.
    Type
    Dissertation-Reproduction (electronic)
    text
    Degree Name
    Ph. D.
    Degree Level
    doctoral
    Degree Program
    Geology
    Graduate College
    Degree Grantor
    University of Arizona
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