Table 1.--Chemical composition (major oxides, loss on ignition, and trace elements) of sandstones, Minturn and Sangre de Cristo Formations. Major oxides determined by wavelength dispersive X-ray fluorescence spectrometry by J. S. Mee and D. F. Siems; loss on ignition (LOI) by heating to 900°C by Mee and Siems; trace elements Cu, Mo, Pb, and Zn by inductively-coupled plasma-atomic absorption emission spectroscopy by J. M. Motooka; thorium and uranium by the delayed-neutron method by R. J. Knight; and all other trace elements by the six-step semi-quantitative spectrographic method by E. F. Cooley. The lower limit of detection was encountered for Co (5 ppm), Mo (.05 ppm), and Sr (100 ppm) for a few samples; such "less than" values were replaced with 3, .05, and 70, respectively. FeTO3, total iron as Fe2O3; LOI, loss on ignition. Blank values, not determined. Click here for Excel file.

Table 2.--Mineral composition of sandstones, Minturn and Sangre de Cristo Formations. Determined by polarizing microscope, 300 points per thin section, by R. E. Phillips. Blank values for feldspar varieties, too altered to identify variety with confidence. Blank rows (for samples 12B, 9A, 9B, 9C, and 9D), not analyzed. Click here for Excel file.

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