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The specific yield of the alluvial aquifer in the Gila River flood plain in southeastern Arizona has been determined using two methods of analysis - the time-drawdown method and the soil-moisture-content method. Time-drawdown data measured at 17 observation wells during a 3.5-day aquifer test define an average apparent specific yield of 0.13. Soil-moisture-content data...

Field mapping in the southern part of the Pequop Mountains has shown the presence of a major structural high which has profoundly affected the stratigraphy of Pennsylvanian and Lower Permian beds; lesser effects of this high persisted into the later Permian.  Within the Park City Group (Permian), the Plymton Formation, overlying the Kaibab Limestone,...

The variation in solvent composition of a mixed solvent used in Soxhlet extraction of sediments has apparently often been overlooked. Owing to azeotropic distillation of the solvent introduced into the apparatus, care must be taken to determine the composition of the solvent actually doing the extracting....

Analytical data, optical properties, and unit-cell parameters are presented for 24 samples of accessory apatites recovered from hybrid granitoid rocks of the southern Snake Range, Nev.  A complete chemical analysis is given for one. In the Snake Creek-Williams Canyonoutcrop area, where the hybrid rocks grade from granodiorite with 63 percent SiO2 to a...

Roll-type uranium deposits contain both ore-stage pyrite and preore or diagenetic pyrite that was present in the host rock before the deposits began to form. Ore-stage pyrite forms as the result of redistribution and accretion from the preore pyrite. Accretion of the ore-stage pyrite seems to be governed by natural laws that limit its concentration...

The occurrence of the second known specimen of Parahyus vagus, from the Tepee Trail Formation, Wyoming, is recorded. As the first specimen was reported from the lower Eocene, this second occurrence casts doubt on the supposed age ranges of both Parahyus and the Tepee Trail....

Orpiment, As2S3, containing up to 1.5 percent antimony has been recognized in carbonaceous arsenic-rich gold ores in the unoxidized East ore body of the Carlin gold deposit. Associated hydrothermal minerals include realgar (AsS) and quartz. Stibnite, commonly associated with realgar in the ores, has not been observed associated with this type of orpiment....

The southern complex, south of the Marquette synclinorium in the Marquette district of Michigan, is dominantly granitic.  The granitic parts of the complex have Rb-Sr ages of about 2.5 b.y. and are classed as of Precambrian W age. The rocks are divided into two major units: (1.) Bell Creek Gneiss consisting mostly of...

Lithostrotion reiseri n. sp. is a cerioid, colonial coral, index fossil for microfossil zones 12-13 (Meramec) in the Lisburne Group in the central and eastern Brooks Range, arctic Alaska....

Phyllite and marble dredged from the lower part of the continental slope between Cuba and the Yucatan Peninsula seem to support the contention that a pre-early Tertiary metamorphic belt extends from the western Greater Antilles into northern Central America. The minimum K-Ar ages derived from the samples suggest that the metamorphic event was pre-Late Cretaceous,...

A classification of wetland plant communities was developed for a study area in north-central Minnesota in order to analyze data on waterfowl use of habitat that were gathered by radio telemetry. The classification employs features of several earlier classifications in addition to new classes for bogs and lakeshore communities. Brief...

Abstract not submitted to date...

Potential commercial fish production was estimated for U.S. waters of western Lake Erie in 1969 from pounds landed and pounds discarded. Periodic observations of catches in haul seines and trap nets revealed that about 37% of the catch (by weight) in haul seines and 26% of that in trap nets...

The acid-insoluble impurities of small samples of minerals are determined by a microgravimetric procedure. A Schwarz von Bergkampf glass filter stick with paper filter medium is used to separate the insoluble material. The filtration apparatus and procedural details are described....

In the autumn of 1969, unusual meteorological conditions over Europe and northern Africa caused an enormous persistent desert storm in Tunisia and eastern Algeria. Poorly developed drainage patterns and gypsum-encrusted surfaces of these desert regions intensified effects of the storm and contributed to the heavy loss of life and property. Destruction of Roman bridges suggests...

The U.S. Geological Survey collected water samples from Arnchitka Island, Alaska, during October 1972. Tritium determinations were made on all samples collected and gross alpha and gross beta/gamma determinations were made on 41 samples. The gross alpha and gross beta determinations when compared with previously determined ranges for fresh waters...

The U.S. Geological Survey established a sampling program on Amchitka Island in 1967 in cooperation with the U.S . Atomic Energy Commission. Water samples are analyzed routinely for tritium, gross alpha, and gross beta/gamma content, Frequency of sampling was semiannually prior to Cannikin and has been bimonthly since the Cannikin...

Inflatable straddle packers were used to isolate and test selected intervals in hole UAe-3. Packer seats were poor in the uncased part of the hole because of unstable wall conditions, and leakage around packers occurred during some tests. However, leakage generally was slight, as shown on pressure-gage charts, and had...

Radiochemical data from the Amchitka Island study area were obtained from water samples collected by the U.S. Geological Survey during August 1973. Tritium determinations were made on 86 samples collected and gross alpha and gross beta/gamma determinations were made on 38 samples. The range of data for these samples was...

An increased dissolved-solids content was found immediately after the Cannikin event (November 6, 1971) at most of 10 locations in a water-sampling network established in 1967 and revised in September 1971. The observed dissolved-solids content increase was within the seasonal range that has been observed at these locations. No measurable increase...

Cuprobismutite from Tunnel Extension Number Two mine, Ohio mining district, Utah, was chemically analyzed using theelectron microprobe.  Its empirical formula was determined to be Cu20.8 Ag0.97 Pb0.35 Mn0.22 Bi26.7Sb0.06 Te0.05 Se0.55 S50.4.  The tentative conclusion is that unsubstituted cuprobismutite has the chemical formula 6Cu2S*6Bi2S3 rather than the previously ascribed formula 6Cu2S*6Bi2S3 and that cuprobismutite...

Sulfur is determined turbidimetrically as barium sulfate after an aqua regia attack. The turbidity is formed in an ammoniacal solution from which R2O3 has been centrifuged. Reproducibility of turbidity is obtained by adding barium chloride as a solid rather than as a solution. Sulfur is determined in the range 0.01-4 percent within ±0.02 absolute, or...

A simple method is described for determining gold in phosphates and phosphatic materials. Samples in a cadmium container are irradiated with epithermal neutrons to minimize the formation of 32 P, while permitting the formation of adequate amounts of 198 Au.  Fire assay-radiochemical methods are used to separate the 198 Au.  Concentrations as low...

Upper Cretaceous mafic conglomerate and quartz-plagioclase arkose that crop out on the southwest side of the San Andreas fault near Gualala, Calif., may have been eroded from a gabbroic terrane that now lies about 350 miles to the southeast, on the opposite side of the San Andreas fault. The plagioclase arkose near Gualala contains little...

On the basis of petrographic and laboratory and active seismic data for the Fra Mauro breccias, and by comparison with the nature and distribution of the ejecta from the Ries crater, Germany, some tentative conclusions regarding the geologic significance of the Fra Mauro Formation on the moon can be drawn. The Fra Mauro Formation, as...