Geology Commons^™

Anisotropism In Garnets, Arthur B. Merkle

Earth and Planetary Sciences ETDs

Six anisotropic garnets are studied by optical, thermal, and X-ray diffraction methods in an attempt to determine the cause of anisotropism. The garnets are all ungrandites with compositions ranging from chromian grossularite to nearly pure andradite, the composition having been estimated from indices of refraction and unit cell dimensions. In all cases the birefringence is 0.004 or less. Both positive and negative uniaxial and biaxial figures are sometimes observed. Heating of the garnets at 900°C for periods of 96 to 264 hours reduced the anisotropism in five of the six garnets studied; this observation is in agreement with previously reported …

A Study Of The Lalande, New Mexico, Yonо̄Zu, Japan, And Glorieta Mountain, New Mexico Meteorites, Ralph G. Stevenson Jr.

Earth and Planetary Sciences ETDs

This thesis presents details relating to the discovery of three meteorites, as well as information concerning their acquisition, description, and mineralogy. These three meteorites are the Lalande, New Mexico chondrite (E.C.N. = 1047,343), the Yonо̄zu, Japan chondrite (E.C.N. = 1394,380), and the Glorieta Mountain, New Mexico siderite (E.C.N. = 1058,356).

The Lalande, New Mexico meteorite is composed of olivine and enstatite (var. hypersthene), with small percentages of enstatite-clinoenstatite intergrowths, secondary hematite, and dispersed metallic grains. Alteration to iron oxide has produced a strong stain over most of the component grains. The meteorite is classified as a hypersthene-olivine chondrite (Chy). …

A Study Of The Breece, New Mexico, Hishikari, Japan And Mino, Japan Meteorites, Louis H. Goldsmith

Earth and Planetary Sciences ETDs

In this thesis are given the details concerning the falls of three meteorites, as well as information regarding their acquisition, description and mineralogy. These three meteorites are the Breece, New Mexico siderite (E.C.N. = 1083, 353), the Hishikari, Japan achondrite (E.C.N. = 1305, 317) * and the Mino, Japan achondrite (E.C.N. =1367, 354)*

The Geology And Geomorphology Of The White Rock Canyon Area, New Mexico, Robert J. Emmanuel

Earth and Planetary Sciences ETDs

The White Rock Canyon area is in the Rio Grande depression in north-central New Mexico between parallels 35 degrees 33' and 35 degrees 53' and meridians 106 degrees 4' and 106 degrees 21' (Figure 1). It occupies part of western Santa Fe County and eastern Sandoval County. The area was named for White Rock Canyon which has been formed by the Rio Grande. This canyon, called Caja del Rio by the Spanish, meaning "box of the river", begins at the town of Buckman and extends southward as a narrow gorge for a distance of 19 miles. The area encloses 316 …

The Geology And Ground-Water Resources Of Bernalillo County, New Mexico, George M. Ugrinic

Earth and Planetary Sciences ETDs

The purpose of this investigation has been to gather information which might aid in the proper development and utilization of the ground-water resources of Bernalillo County. Ground-water is one of the most valuable resources in the area. Its importance may best be realized by considering the fact that most of the water used in the County comes from wells. Albuquerque has increased its total annual consumption from 385,000,000 gallons in 1920 to an estimated 2,897,000,000 gallons in 1947, owing largely to a large population increase. Per capita annual consumption rose from 25,400 gallons in 1920 to 55,711 gallons in 1947 …

Geology Of The Golden Area, Santa Fe County, New Mexico, W. L. Emerick

Earth and Planetary Sciences ETDs

This report represents a detailed study of the geology of a small area in the vicinity of Golden, Santa Fe County, New Mexico. The area is one of low hills, dissected by numerous small arroyos, lying between the Ortiz Mountains on the north and the San Pedro Mountains on the south. To the west the area merges into the Hagan Coal Basin, and to the east the low pass between the mountains descends into the headwaters of Galisteo Creek and into the Estanica Valley.

Geology Of The Southern Ladron Mountains, Socorro County, New Mexico, E.A. Noble

Earth and Planetary Sciences ETDs

The Ladron Mountains are in a fault-block range consisting in large part of Pre-Cambrian rocks. They are flanked on the west by Paleozoic sediments and elsewhere by Tertiary and Quaternary deposits. The Pre-Cambrian rocks of the southern Ladron Mountains consist of a thick sequence of quartzite and schist which has been granitized by a sub-adjacent intrusion to such a degree that only remnants of unaltered quartzite and schist remain, the remainder of the rocks being largely paragneiss and para-granite. The nature of the intrusion is not known, but it is suggested that it may have been at least partly formed …

Geology Of The Hagan Coal Basin, Earl P. Harrison

Earth and Planetary Sciences ETDs

This study was undertaken with the foremost objective of determining the stratigraphy and structure of the area, and correlating it with known surrounding areas.

The method of study was through geologic mapping in the field. The formational contacts, faults and other features were studied in the field with the aid of aerial photographs. The sections were measured in the field by hand-leveling with a Brunton compass up across the exposures. The lithology of the formations was studied as the sections were measured. The base map was taken from a planimetric map prepared by the Soil Conservation Service from aerial photos. …

Paleoecology Of The Brachiopoda, Celia Faith Hendren

Earth and Planetary Sciences ETDs

The immediate concern of the writer in the preparation of this thesis is not so much to give long statistical lists of conclusions (unfortunately this type of material is exceedingly scarce), but to sift the readily available facts in print and prepare a brief history of the work already accomplished on living and fossil Brachipoda. Where possible, there will be a discussion and evaluation of the views presented by different authors.

Correlation Between Electric And Lithologic Characteristics In Four Wells In San Juan County, New Mexico, Edward C. Beaumont

Earth and Planetary Sciences ETDs

The primary objective of the problem is to relate electric characteristics to lithologic characteristics in four wells in San Juan County, New Mexico. The secondary objective is to decipher stratigraphic correlations between wells. The wells, in San Juan County, are geologically located in the San Juan Basin, a structural basin in the Colorado Plateau. The formations range in age from Paleozoic Cambrian (?) to Cenozoic Recent. The boundaries of the Basin are ill-defined and have shifted throughout the history of the area.

Paragenesis Of The Ores Of Poughkeepsie Gulch, San Juan Mountains, Colorado, Leon T. Silver

Earth and Planetary Sciences ETDs

It is the purpose of this study to supplement the recognized geologic field relations with a laboratory study of the mineral assemblage of the area and its paragenesis. It is hoped that the results may be employed in amplifying the knowledge of the origin of ore bodies in Poughkeepsie Gulch. The work as presented in this thesis consists of a description of the general mineralogy, descriptions and analyses of the ores by mine suites, and conclusions based upon the observed paragenesis. This material is preceded by introductory remarks on the source of data, previous work, and geologic setting.

A Petrographic Study Of The Lower Madera Limestone In Central New Mexico, Rose B. Johnson

Earth and Planetary Sciences ETDs

The purpose of this paper is to discuss the stratigraphic and paleontologic relations, the petrographic and insoluble-residue analysis and collation, methods of correlation and means of identification, and the geologic history and economic significance of the Gray limestone member of the Madera formation, as well as to define more sharply the present gradational boundaries.

Geology And Ore Deposits Of The Dunmore Mine, Ouray County, Colorado, Caswell Silver

Earth and Planetary Sciences ETDs

The Dunmore lode is located near Ouray, Colorado in the northwest part of the San Juan Mountains. In structure as well as mineral assemblage it shows a connection between the chimneys and veins of the region. The lode averages about 100 feet wide for 1,200 feet along the Dunmore claim. The fissure zone is over two miles long and displacement along it has offset a folded pre-Cambrian complex 4,500 feet prior to the deposition of 2,400 feet of volcanic tuff. Fissures in the pre-Cambrian rocks controlled in part the intrusion of dikes and the formation of veins. Late Tertiary faulting …

The Minerals Of New Mexico, Lee Mcguinness

Earth and Planetary Sciences ETDs

Inorganic bodies known as minerals make up, either in whole rock-masses or in isolated form, the material of the upper crust of the earth. Through the evidence furnished by this study of meteorites, we also infer that other bodies in the universe are made up of minerals, or at least those portions of them which are represented by meteorites.

Since minerals are, then, important in making up the observable part of the earth, a study of them is importance in any study of the earth. Because the variety of minerals occurring in New Mexico is large, it will be of …

The Paleontology And Stratigraphy Of The Magdalena Group Of Northern And Central New Mexico, Wallace A. Bisbee

Earth and Planetary Sciences ETDs

No abstract provided.

Paleontology Of The Upper Cretaceous Of Chaco Canyon, New Mexico, Richard Pickard Vann

Earth and Planetary Sciences ETDs

It is the purpose of this paper to describe some Upper Cretaceous invertebrate fossils (including descriptions of an algal form, and some vertebrate teeth) collected by the writer in Chaco Canyon, New Mexico, and to give a brief summary of the physiography and stratigraphy of the region.

Geological Report Of The Shoshone Region, Idaho, Eldred R. Harrington

Earth and Planetary Sciences ETDs

This report sets forth the results of a five year study of the Shoshone region, Idaho. The region is situated in south-central Idaho on both sides of the Snake river. The southern and larger part of the region lies in the Columbia River Plateau province while the northern and smaller part of the area lies in the Northern Rocky Mountains province.

An areal geology map and several cross-sections accompany the report which is further illustrated by numerous photographs.

Report On A Portion Of The Soda Springs Mining District In Bernalillo County, New Mexico, Edmund Ross

Earth and Planetary Sciences ETDs

No abstract provided.