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PROJECT BACKGROUND There have been great advances in the last 20 years in understanding the volcanic, structural, geophysical, and petrologic development of the CoSo Range and Coso geothermal field (Figure 1). These studies have provided a wealth of knowledge concerning the geology of the area, including general structural characteristics and kinematic history. One element missing from this dataset was an understanding of the sedimentology and stratigraphy of well-exposed Cenozoic sedimentary strata-the Coso Formation.

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