Geology and uranium deposits of the Lucero uplift, Valencia, Bernalillo, and Sandoval counties Page: 2
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INTRODUCTION
The Lucero uplift covers over 1,100 square miles in northwest
New Mexico (fig. 1). The Jurassic rocks outcrop as a crescent-
shaped area of 300 square miles and extend from the northeast to the
southwest side of the uplift. Paleozoic rocks are on the east and
southeast; the Chinle formation of Triassic age forms a large valley
in the middle of the uplift; and the Dakota sandstone of Cretaceous
age crops out as a cuesta nearly encircling the area and is arbi-
trarily employed as an outline for the uplift.
A geologic map of the Lucero uplift was prepared between June 30
and September 11, 1952 to aid in the investigation of uranium in the
Jurassic rocks of the area, and also some rim examination for radio-
activity was accomplished. The field information was recorded on
aerial photographs (scale 1:62,500) and later transferred to U. S.
Soil Conservation Service planimetric maps (scale 1:31,680).
Darton (1928) prepared a geologic map of an area which included
the Lucero uplift in 1928. Hunt (1936) classified the youngest
Jurassic units under the general name "Morrison formation" in his
geologic map which extended into the northeast corner of the Lucero
uplift. Kelly and Wood (1951) divided the Jurassic into Entrada and
Morrison formations on their oil and gas map which covered the eastern
margin of the Lucero uplift. The southeastern part of the generalized
isopach maps prepared by Craig and others (1951) include the northern
portion of the Lucero uplift.
The co-operation of tha Anaconda Copper Mining Company was very
helpful in mapping the area. Acknowledgment is due Dr. V. C. Kelley
of the University of New Mexico, R. H. Wilpolt and P. E. Melancon-2-
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Mirksy, Arthur & Chenoweth, William L. Geology and uranium deposits of the Lucero uplift, Valencia, Bernalillo, and Sandoval counties, report, October 27, 1952; (https://digital.library.unt.edu/ark:/67531/metadc1393202/m1/4/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.