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Scanned logs of down-hole lithologic and radiologic information from Arizona, Colorado, South Dakota, Utah, and Wyoming

Published by U.S. Geological Survey | Department of the Interior | Metadata Last Checked: January 27, 2026 | Last Modified: 2025-01-17T00:00:00Z
This data release contains digitized well logs from a historic uranium exploration program conducted by the U.S. Atomic Energy Commission (AEC) between 1948 and 1956. The well logs document down-hole lithologic and radiologic information from drilling activities primarily in the Colorado Plateau (Colorado, Utah, Arizona, New Mexico), Wyoming, and South Dakota. These logs, originally archived in paper and Mylar formats, were digitized by the U.S. Geological Survey (USGS) and are provided in .pdf format, and associated header information describing file is also compiled. These scans of well logs, provide a significant, though incomplete, record of the drilling activities conducted during this period. The logs were transferred through various governmental bodies before being housed at the USGS in Denver. While well headers often do not contain sufficient information for georeferencing, related AEC and USGS reports often include maps with drill hole locations. This data release offers a valuable historical resource for research and public access, with the scanned logs available for download by state.

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