Field logs of boreholes for nested piezometers, Tome site, Valencia County, New Mexico

Lithologic descriptions were made by visual examination of mud-rotary cuttings taken from the well head at IO-foot intervals (Table5).Drilling methods prevent a complete evaluation of the finer grained fraction (commonly fine-grained sand and silt) that tends to be held in suspension by the drilling fluids.Sieve testing was not conducted.Lithologic descriptions are based on the following criteria:-1. Major textural class; 2. Estimated grain-size distribution by major textural class: a. silt-clay (c0.05 mm) b. sand (0.05-2.00 mm) c. gravel (>2.00 mm) 3. Grain and clast shape; 4. Sorting and approximate range of grain and clast size; 5. Clast composition and approximate relative abundance, in decreasing order of 6. Color, using Munsell(1992) notation; 7. Other characteristics and selected driller's comments. abundance;Hydrostratigraphic subdivisions of the borehole were made using nomenclature developed for alluvial deposits in the Albuquerque Basin by Hawley and Whitworth (1996).In this system deposits are assigned to gravely and sandy fluvial (I-III), eolian (IV), piedmont (V-VIII), and fine-grained basin-floodplaya W-X) lithofacies.These lithofacies are used to determine hydrostratigraphic units that are subdivided into post-Santa Fe Group and Santa Fe Group depo'sits.Post-Santa Fe Group units include fluvial-terrace deposits (RA and TA), and piedmont deposits (PA).Santa Fe Group hydrostratigraphic units consist of fluvial and piedmont deposits that are further subdivided into upper (USF), middle (MSF), and lower (LSF) sub-units.The lack of available high-quality lithologic and geophysical log data from neighboring wells precludes definitive hydrostratigraphic classification using this system of nomenclature

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