. Carnegie Institution of Washington publication. Chapter I. DESCRIPTION OF THE VERTEBRATE-BEARING BEDS OF NORTH-CENTRAL NEW MEXICO. S. W. WiLLISTON AND E. C. CaSE. The following description of the Permo-Carboniferous beds of New Mexico is a portion of a more extended article by the authors in the Journal of Geology, only such portions being repeated as bear upon the character of the beds and indi- cate the conditions under which the animals lived and were preserved.* The regions explored were El Cobre Caiion, north of Abiquiu, and the expos- ures in the walls of the Puerco and Gallina Rivers,
. Carnegie Institution of Washington publication. Chapter I. DESCRIPTION OF THE VERTEBRATE-BEARING BEDS OF NORTH-CENTRAL NEW MEXICO. S. W. WiLLISTON AND E. C. CaSE. The following description of the Permo-Carboniferous beds of New Mexico is a portion of a more extended article by the authors in the Journal of Geology, only such portions being repeated as bear upon the character of the beds and indi- cate the conditions under which the animals lived and were preserved.* The regions explored were El Cobre Caiion, north of Abiquiu, and the expos- ures in the walls of the Puerco and Gallina Rivers, all in Rio Arriba 106 30 Fig. I.—Map of the Mesa Prieta and adjoining country. Fossiliferous Permo-Carboniferous areas shown by shading. Comparison with the Gallina topographic sheet will make details clear. El Cobre Canon or basin is formed by the erosion of an unsymmetrical dome- shaped anticline, more or less faulted on the northeastern and southeastern sides, the brim formed everywhere by the massive sandstones of basal Upper Triassic age, the strata sloping in all directions, but chiefly east and west. The basin thus • The Permo-Carboniferous of northern New Mexico. Journal of Geology, vol. XX, No. i, pp. 1-12. I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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