In the fall of 1953 a reconnaissance for uranium was made in the Datil area of west-central New Mexico, and in the Cerrillos mining district, the Glorieta and Tecolote districts, and the Las Vegas and Colfax sill areas of north-central to northeastern New Mexico. Traces of radioactive materials were detected at many places, and deposits of uranium minerals, which may be of possible economic significance, were found near the village of Datil. Small amounts of uranium are widespread in sandstone beds in the Mesaverde formation. The sample of highest grade contained 0.056 percent uranium.
Water resources ContinuedGround water in the Valles Caldera area Continued Recharge, movement, and discharge-_----___________________ Aquifer hydraulic coefficients______________________________ Effect of wells on ground-water regimen ______________________ Chemical quality of water, by John D. Hem__________________
Introduction Historical summary Purpose of this investigation Area studied-Methods of investigation Acknowledgments 5 Summary of the stratigraphy of the Green River Formation The altered tuffaceous rocks of the Green River Formation The altered ash-fall beds of the Parachute Creek Member General characteristics Key beds and groups of beds Beds below B groove 9 Beds between A and B grooves 9 The wavy bed 11 The upper zone of altered tuffs 12. The white bed Petrography 13 The two types of altered ash-fall beds The analcitized type-« The feldspathized type Key beds and groups of beds Beds below B groove Beds between A and B grooves The wavy bed The upper zone of altered tuffs The white bed The water-washed tuffaceous rocks 30 Petrology 34 Field observations-Laboratory investigations Genesis of the analcite and feldspar References 37 CONTENTS Illustrations Plates [In pocket] Plate 1. Outline of the part of the Piceance Creek Basin between the Colorado and White Rivers. 2. Columnar sections of cores. 3. Columnar sections of cores.
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