Stratigraphy of the uppermost Triassic and the Jurassic rocks of the Navajo country

Abstract

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 Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. 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, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States. No material from the NMGS website, or printed and electronic publications, may be reprinted or redistributed without NMGS permission. Contact us for permission to reprint portions of any of our publications. One printed copy of any materials from the NMGS website or our print and electronic publications may be made for individual use without our permission. Teachers and students may make unlimited copies for educational use. Any other use of these materials requires explicit permission. This page is intentionally left blank to maintain order of facing pages.

Synthesis of late Paleozoic and Mesozoic eolian deposits of the Western Interior of the United States

“…In southwestern Colorado, these rocks are assigned to the upper member of the Dolores Formation (Blodgett, 1984). Eolian deposits consist of cross-stratified sandstone of dune origin and laminated to hummocky sandstone of sand-sheet origin, both intercalated with fluvial and lacustrine deposits (Harshbarger et al, 1957;Stewart et al, 1972;Blodgett, 1984). We are unable to construct either isopach maps or percentage-of-eolian-strata maps from existing literature or unpublished information known to us.…”

“…Although equivalent to the upper part of the Chinle Formation, Harshbarger et al (1957) included the Rock Point in the Wingate Sandstone because of supposed intertonguing between the Rock Point and Lukachukai Members. Later work has failed to confirm intertonguing and instead has suggested the presence of an unconformity, the J-0, between the two units (Pipiringos and O'Sullivan, 1978;Peterson and Pipiringos, 1979).…”

A Novel Approach to Experimental Studies of Mineral Dissolution Kinetics

“…The major mineral component of Navajo Sandstone is quartz, with ~2% feldspars (Harshbarger et al, 1957;Dulaney, 1989;Zhu, 2005). 4 grams of Navajo sandstone were reacted with 40 grams 200 mmol/kg KCl solution in the presence of 20 mmol/kg CO 2 (aq).…”

Distribution of elements in sedimentary rocks of the Colorado Plateau - a preliminary report

“…In places, the Bluff sandstone intertongues with the underlying Summerville formation and also intertongues with the overlying Morrison formation. Harshbarger, Repenning, and Irwin (1957) believe that the Bluff sandstone is a tongue of the Cow Springs sandstone, extending northward from the main mass of the Cow Springs.…”