Excerpt from The Manzano Group of the Rio Grande Valley, New Mexico
Purpose of report. - The purpose of the present paper is to describe the red beds of that part of the Rio Grande valley which lies between Santa Fe and Rincon, a distance of about 200 miles, and to establish their position in the geologic column. The rocks, consisting of sandstone and shale, prevailingly red in color, and containing gypsum and limestone, constitute a part of the so-called "Red Beds" of the Rocky Mountain region. On account of their general similarity in color and composition to the red beds that are exposed in the eastern foothills of the Rocky Mountains and that extend from the mountains eastward and southeastward into Kansas, Oklahoma, and Texas, they have been regarded as Permo-Triassic in age.
While my principal object is to present the evidence that tends to fix the geologic age of the red beds of the Rio Grande valley, the relation of these to other beds of similar nature is also considered. However, I have no intention to discuss the various aspects of the complicated "Red Beds" problem or even to review the numerous contributions to it. I purpose, rather, to confine attention to such phenomena as I have personally observed in the field and to such considerations as may have a direct bearing upon the interpretation of these observations.
Preliminary statement of results. - The red beds of the Rocky Mountain region are unfossiliferous in many places, but on account of their stratigraphic relations have frequently been called "Jura-Triassic" - a term still in common use.
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