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Stratigraphy And Structure Of The Northwestern Guadalupe Mountains, New Mexico, Klyne Headley

Earth and Planetary Sciences ETDs

The northwestern Guadalupe Mountains of southeastern New Mexico are part of a large regional cuesta that slopes gently northeast. The crest of the northern escarpment rises abruptly to more than 2,200 feet above Pinon Valley.

The rugged west-facing escarpment has been carved in an uplifted fault block composed entirely of Permian sedimentary rocks having an aggregate thickness of about 1,700 feet. Dark-red to buff siltstone, gray dolomite, and white to gray gypsum compose the Yeso Formation. Conformably overlying these rocks is the dark-brown limestone and dolomite sequence of the San Andres Formation. The Glorieta Sandstone which usually occurs between these …

Origin Of Reeflike Masses In The Upper Member Of The San Andres Formation, Central Guadalupe Mountains, Eddy County, New Mexico, Richard Lane Squires

Earth and Planetary Sciences ETDs

Several reeflike masses crop out in the upper part of the Upper member of the San Andres Formation in the Last Chance Canyon area, southeastern New Mexico. The reeflike masses are situated on the Northwest shelf adjacent to the Delaware basin of Permian age. Based on the compilation of the field and laboratory data, it was concluded that the reeflike masses are not reefs at all and such exposures are termed pseudoreefs. No criteria were found which could be used to differentiate the masses from surrounding, laterally equivalent strata since both consist of relatively unfossiliferous dolomitized mudstones and wackestones. The …

Petrography And Structure Of The Pedernal Hills, Torrance County, New Mexico, Ralph Alan Gonzales

Earth and Planetary Sciences ETDs

In the Pedernal Hills, in the eastern part of north-central New Mexico, five Precambrian metamorphic and igneous rock types occur. Stratigraphically, oldest to youngest, they include medium-grained granite gneiss; quartzite, quartz-mica schist, and quartz-specular hematite schist; schist unit consisting mainly of quartz-muscovite schist and greenstone; intrusive granite which includes rocks ranging from quartz diorite to alkali granite; and cataclasite representing dynamically metamorphosed rocks.

The Geology Of The Jicarilla Mountains, Lincoln County, New Mexico., George Ernest Ryberg

Earth and Planetary Sciences ETDs

The Jicarilla Mountains in west-central Lincoln County, New Mexico, consist of Permian, Triassic, and Cretaceous sediments intruded by Tertiary sills, dikes, laccoliths, and stocks. The upper 50 feet of the Yeso Formation is exposed and is conformably overlain by the San Andres Formation which consists of the lower Sandstone, and middle Limestone, and upper Gypsum members. The Permian Artesia Formation, which is about 300 feet thick, unconformably overlies the Gypsum member. Unconformably overlying the Artesia Formation is a 200-foot section of the Triassic Santa Rosa Formation. The boundary between the Santa Rosa Formation and the overlying Chinle Formation is gradational. …

The Geology Of The White Oaks-Patos Mountain Area, Lincoln County, New Mexico, Richard A. Haines

Earth and Planetary Sciences ETDs

The White Oaks-Patos Mountain area is in the north­ central portion of the Sierra Blanca basin in central Lincoln County, New Mexico. The rocks consist of Permian, Triassic, and Cretaceous strata intruded by early Tertiary sills, dikes, and laccoliths. The 2,900 feet of sedimentary strata include 750 to 800 feet of Permian rocks, 550 feet of Triassic rocks, and 1700 feet of Cretaceous rocks. Extensive Tertiary­ Quaternary pediments cover much of the area.

The mapped area lies in the center of a large concentra­tion of Tertiary intrusive bodies known as the ln County porphyry belt, including Patos Mountain. Igneous rocks …

Geology Of The Southern Pilot Range, Elko County, Nevada And Box Elder And Tooele Counties, Utah, John Michael O'Neill

Earth and Planetary Sciences ETDs

The southern Pilot Range is a slightly sinuous, north-trending mountain range located in the northeastern part of the Great Basin.

Approximately 18,500 feet of miogcosynclinal sedimentary rocks representing every system from late Precam­brian to Permian(?) are exposed in the southern Pilot Range. Because of intense faulting, many of the strati­graphic relationships between the formations are impossible to determine. Mesozoic and Tertiary strata are absent; however, Pleistocene Lake Bonneville deposits are wide­ spread, although thinly distributed. Small igneous stocks, dikes, and sills are common only in the southern two-thirds of the map area. Stocks are principally granodioritic. In several cases the …