U.S. Geological Survey

Organic geochemistry of oils
from Oil Spring and Florence Oil Field
near Caņon City, Colorado

By Paul G. Lillis, Michael P. Dolan, Augusta Warden, and J. David King

U.S. Geological Survey Open File Report 98-617
Oil Spring is an oil seep located approximately 6 miles north of Caņon City, Colorado. The purpose of this study is to determine whether the oil from Oil Spring and the oil from nearby Florence oil field share a common source. Bulk and molecular geochemical analyses show that the oil seep is most likely derived from a group of geochemically similar Cretaceous source rocks including the Carlile Shale, Greenhorn Limestone, Graneros Shale, and the Mowry Shale. The Florence oil is derived from the Sharon Springs Member of the Upper Cretaceous Pierre Shale.
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For more information about this report contact: Paul Lillis
U.S. Department of the Interior
U.S. Geological Survey

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