Rocks definitely or tentatively classified as Permian in age crop out in a number of uplifts in the Colorado Plateaus Province in northeastern Arizona and adjacent parts of New Mexico and Utah. This report specifically treats of these rocks in the Zuni uplift, the Defiance uplift, and the Monument Valley upwarp. In the Zuni uplift, New Mexico, the sequence, in ascending order, consists of the Abo formation, the Yeso formation, the Glorieta sandstone, and the San Andres limestone. The Yeso formation is .divided into the Meseta Blanca sandstone member and the San Ysidro member. Thirty miles northwest from the northernmost outcrops of Permian rocks in the Zuni uplift, generally equivalent strata are exposed in Arizona in the southern part of the Defiance uplift. In ascending order this sequence consists of the Supai formation and the De Chelly sandstone. In tracing the sequence northward a lower tongue or member of the De Chelly sandstone appears and becomes progressively more prominent until in Bonito Canyon the two members merge to form the twoledged De Chelly sandstone that is characteristic of the northern part of the uplift. It is apparent that the Supai formation in the southern part of the Defiance uplift is the equivalent of both the Abo and the Yeso formations in the Zuni uplift and that the upper member of the De Chelly sandstone is correlative with the Glorieta sandstone. In the northern part of the Defiance uplift, however, the lower member of the De Chelly sandstone is equivalent to the upper part of the Yeso formation of the Zuni uplift. The Permian sequence in the Monument Valley upwarp consists of the Rico formation, which in this particular area is very tentatively classified as Permian (?), overlain by the Cutler formation. The Cutler formation has been divided in ascending order into the Halgaito tongue, the Cedar Mesa sandstone member, the Organ Rock tongue, and the De Chelly sandstone member. Overlying the Cutler is the Hoskinnini member of the Moenkopi formation which is now classified as Triassic(?). The Halgaito tongue, the Cedar Mesa sandstone member, and all the Organ Rock tongue except its uppermost beds are believed to correlate with the Supai formation of the Defiance uplift. The uppermost beds of the Organ Rock tongue appear to be equivalent to the lower member of the De Chelly sandstone in the Defiance uplift and the De Chelly sandstone member of the Cutler formation in Monument Valley correlates with the upper member of the De Chelly sandstone in the Defiance uplift. Available data suggest that the Hoskinnini may be Triassic (Moenkopi) in age but are inadequate to demonstrate it conclusively. In consequence, the Hoskinnini is classified as Triassic (?).
Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free DownloadsNMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, and other selected content are available only in print for recent guidebooks.
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