A re-evaluation of basalt-obsidian relations at East Lake Fissure, Newberry Caldera, Oregon
Michael W. Higgins, Aaron C. Waters
1970, Bulletin of the Geological Society of America (81) 2835-2842
Andesite scoria, agglutinate, and small flows formed by thin lava gushes that erupted from East Lake Fissure on the north wall of Newberry Caldera carry numerous inclusions of platy rhyolite, partly melted platy rhyolite, and frothy obsidian. This association of obsidian and “basalt” has been...
Geochronology of Tertiary igneous rocks in central Nevada
Edwin H. McKee, Miles L. Silberman
1970, Bulletin of the Geological Society of America (81) 2317-2327
Potassium-argon dating of Tertiary igneous rocks in Lander County, central Nevada, indicates that igneous activity was episodic and can be separated into three periods. Igneous activity started abruptly about 37 m.y. ago with local extrusion of andesitic to quartz-latitic lava flows and intrusion of hypabyssal rocks of similar composition. This...
Deuterium content of snow cores from Sierra Nevada area
I. Friedman, G.I. Smith
1970, Science (169) 467-470
The relative deuterium content was measured on 37 snow cores collected in April 1969 in the Sierra Nevada. The deuterium content varies inversely with altitude of collection (approximately 40 per mil per 1000 meters) but is unrelated to latitude. The altitude relationship is particularly well defined west of the crest...
4 Earthquake: Major offshore earthquakes recall the Aztec myth
United States Department of Commerce
1970, Earthquake Information Bulletin (USGS) (2) 4-7
Long before the sun clears the eastern mountains of April 29, 1970, the savanna highlands of Chiapas tremble from a magnitude 6.7 earthquake centered off the Pacific coast near Mexico’s southern border. Then, for a few hours, he Isthmus of Tehuantepec is quiet....
Saline ground-water resources of the Tularosa Basin, New Mexico
J. S. McLean
1970, Research and Development Progress Report 561
This report describes the location, extent, and quality of saline ground water in the Tularosa Basin, a north-trending elongated, intermontane, desert basin in south-central New Mexico. There are no through-flowing streams; runoff from the bordering mountains flows to ephemeral lakes in the center of the basin. Fresh-water supplies in the Tularosa...
Aspects of oil and gas operations on federal and Indian lands of interest to engineers
Charles J. Curtis
1970, Conference Paper, SPE Rocky Mountain regional meeting
It is always enjoyable to attend any meeting of the Society of Petroleum Engineers. I am happy to have this opportunity to speak to you because I believe that petroleum engineers can benefit from a better understanding of the Mineral Leasing Act and the regulations that implement the act insofar...
Geophysical studies of the Cripple Creek mining district, Colorado
M. Dean Kleinkopf, Donald L. Peterson, Garland B. Gott
1970, Geophysics (35) 490-500
Integrated geophysical, geochemical, and geological interpretations expand the knowledge about the localization of the ore deposits in the Cripple Creek district, Colorado. The principal gold deposits occur in a Tertiary volcanic subsidence basin within Precambrian granite, gneiss, and schist. The basin is filled with volcanic...
Origin of the disturbed belt in northwestern Montana
Melville R. Mudge
1970, Article
The northern part of the disturbed belt in Montana is a northwesterly trending zone of closely spaced westerly dipping thrust faults, many folds, and some longitudinal normal faults and transverse faults. The theory of vertical uplift that results in gravitational gliding is a reasonable explanation of the origin of the...
Variations of major chemical constituents across the central Sierra Nevada batholith
P. C. Bateman, F. C. W. Dodge
1970, Bulletin of the Geological Society of America (81) 409-420
A study of 193 chemical analyses of plutonic rocks from 132 localities in the central Sierra Nevada shows convincingly that K2O decreases systematically westward and suggests that Fe2O3 and TiO2 may also decrease westward and that FeO, MgO, and CaO may increase. The ratio K2O/SiO2 obviously decreases westward across six of eight provisionally...
Geology and ground-water resources of Linn County, Iowa
Robert E. Hansen
1970, Water Supply Bulletin 10
Linn County, in east-central Iowa, covers about 713 square miles and lies in the Western Young Drift section of the Central Lowlands physiographic province. The normal annual rainfall in the county is about 88 inches and the annual mean temperature is about 48°F. The population in 1960 was 136,899, of...
Tertiary tectonics of the White Pine-Grant Range region, east-central Nevada, and some regional implications: Discussion
Harald Drewes
1970, Bulletin of the Geological Society of America (81) 319-321
No abstract available....
Taunton River basin
John R. Williams, Richard E. Willey
1970, Massachusetts Hydrologic - Data Report 12
The Taunton River, emptying into an arm of Narragansett Bay at Fall River, drains 528 square miles of interior southeastern Massachusetts. The Taunton River basin is separated from the basins of short streams draining to the coast by low divides on the east, south, and southwest. On the west and...
Foraminiferal zonation and carbonate facies of Carboniferous (Mississippian and Pennsylvanian) Lisburne group, central and eastern Brooks range, Arctic Alaska
Augustus K. Armstrong, Bernard L. Mamet, J. Thomas Dutro
1970, American Association of Petroleum Geologists Bulletin (54) 687-698
The Lisburne Group carbonate rocks of the central and eastern Brooks Range contain foraminiferal assemblages assigned to zones of late Tournaisian (Osage) to early Moscovian (Atoka) age. Representatives of both Eurasiatic and American cratonic microfaunas permit correlation with the original Carboniferous type sections in western Europe as well as with...
Structural control of wind gaps and water gaps and of stream capture in the Stroudsburg area
Jack B. Epstein
1969, Conference Paper, Geology of selected areas in New Jersey and eastern Pennsylvania and guidebook
No abstract available....
Petroleum potential of the Kandik basin, east-central Alaska
Michael Churkin, Earl E. Brabb
1969, Open-File Report 1305 MP
No abstract available....
Hydrogeologic data for the southwestern coastal river basins, Connecticut
Mendall P. Thomas, Robert B. Ryder, Chester E. Thomas Jr.
1969, Connecticut Water Resources Bulletin 18
This report presents hydrologic and geologic data collected by the U.S. Geological Survey during an investigation of water resources in the southwestern coastal river basins of Connecticut in cooperation with the Connecticut Water Resources Commission. These basins occupy about 394 square miles in Connecticut and 46 square miles in New York, including the towns...
Primitive and contaminated basalts from the Southern Rocky Mountains, U.S.A
B. R. Doe, P. W. Lipman, C. E. Hedge, H. Kurasawa
1969, Contributions to Mineralogy and Petrology (21) 142-156
Basalts in the Southern Rocky Mountains province have been analyzed to determine if any of them are primitive. Alkali plagioclase xenocrysts armored with calcic plagioclase seem to be the best petrographic indicator of contamination. The next best indicator of contamination is quartz xenocrysts armored with clinopyroxene. On the rocks and...
Effects of the earthquake of March 27, 1964, on various communities
George Plafker, Reuben Kachadoorian, Edwin B. Eckel, Lawrence R. Mayo
1969, Professional Paper 542-G
The 1964 earthquake caused wide-spread damage to inhabited places throughout more than 60,000 square miles of south-central Alaska. This report describes damage to all communities in the area except Anchorage, Whittier, Homer, Valdez, Seward, the communities of the Kodiak group of islands, and communities in the Copper River Basin; these...
Pecos National Monument, New Mexico: Its geologic setting
Ross Byron Johnson
1969, Bulletin 1271-E
The ruins of the pueblos and missions of Pecos lie on the east bank of Glorieta Creek near its junction with the Pecos River at the south end of the Sangre de Cristo Mountains in north-central New Mexico. Here the Pecos River and Glorieta Creek have formed a broad rolling...
Paleogene floras from the Gulf of Alaska
Jack A. Wolfe
1969, Open-File Report 69-323
Numerous collections of fossil plants from the Gulf of Alaska region were obtained from rocks that are well dated by marine mollusks. The mollusks indicate that the oldest possible age for the lowest plant assemblage is middle Eocene (Domengine) and that the youngest possible age for the highest Paleogene plant...
Regional hydrogeology of the Navajo and Hopi Indian Reservations, Arizona, New Mexico, and Utah, with a section on vegetation
M. E. Cooley, J. W. Harshbarger, J. P. Akers, W. F. Hardt, O.N. Hicks
1969, Professional Paper 521-A
The Navajo and Hopi Indian Reservations have an area of about 25,000 square miles and are in the south-central part of the Colorado Plateaus physiographic province. The reservations are underlain by sedimentary rocks that range in age from Cambrian to Tertiary, but Permian and younger rocks are exposed in about...
Cretaceous sedimentation and tectonism in the southeastern Kaiparowits region, Utah
Fred Peterson
1969, Open-File Report 69-202
Upper Cretaceous strata in the southeastern Kaiparowits region of south-central Utah consist of approximately 3,500 feet of interfingering sandstone, mudstone, shale, and coal in the Dakota Formation (oldest), Tropic Shale, Straight Cliffs Formation, and Wahweap Formation (youngest). The formations consist of several depositional facies that can be recognized by characteristic...
Preliminary geologic interpretation of aeromagnetic data in the Nixon Fork district, Alaska
Lennart A. Anderson, Bruce L. Reed, Gordon R. Johnson
1969, Open-File Report 69-9
An aeromagnetic map covering 480 square miles was compiled for the Nixon Fork district, which is located approximately 35 miles northeast of McGrath, Alaska. The survey was flown in search of concealed intrusive rocks which may have produced contact metamorphic deposits in limestone similar to the known lode deposits which...
Ground water in the Ogallala formation in the southern high plains of Texas and New Mexico
J.G. Cronin
1969, Hydrologic Atlas 330
The Ogallala Formation of Tertiary (Pliocene) age is the principal aquifer in the Southern High Plains of western Texas and eastern New Mexico. This heavily pumped aquifer supplies practically all the water used for irrigation, municipal, industrial (except oil-field repressuring), and domestic purposes. Although the ground water in the Ogallala Formation...
Geology, hydrology, and water quality in the Fresno area, California
Roland Westland Page, R.A. LeBlanc
1969, Open-File Report 69-328
The Fresno area comprises about 1.400 square miles lying west of the foothills of the Sierra Nevada and east of the trough of the San Joaquin Valley. The rainfall averages less than 10 inches per year causing agricultural development to depend mainly on surface-water deliveries and ground-water pumpage. Surface-water deliveries...
