Search Results

Methods of collection and analysis of epifaunal communities from six stations in the Patuxent estuary are described. The stations were distributed from Solomons near the mouth of the estuary, upstream to Lower Marlboro, near the limit of salt water intrusion. Species composition and abundance, seasons of attachment, and production of the epifaunal community were...

In connection with a paper by Baldwin and Gross on the localization of residual hematite ore (for reference, see this Bibliography Vol. 31, No. 7, 02 E67-05748), inaccuracies in the citations from the literature used for purposes of comparison are pointed out,...

No abstract available....

No abstract available. ...

Concentrated saline brine tapped by a deep well drilled for geothermal power near the Salton Sea, California, deposited metal-rich siliceous scale at the rate of 2 to 3 tons per month. The iron-rich opaline scale contains an average of 20% Cu and up to 6% Ag present in bornite, digenite,...

The quality which is necessary depends on the use to which the water will be put. Because uses vary, so also must quality standards. Maintaining any level of quality presents a problem of cost and depends on variations in natural water characteristics, in time and space, and variations in volume...

The acute toxicity of lead, three types of plastic-coated lead, two lead-magnesium alloys, iron, copper, zinc-coated iron, and molybdenum-coated iron shot were tested in year-old male game farm mallards. Mallards (Anus platyrhynchos) were fed eight number 6 shot of each type and observed for a period of 60 days. Ducks...

Studies conducted 1961-65 at the Montezuma National Wildlife Refuge in New York demonstrated that mallards (Anas platyrhynchos) and black ducks (Anas rubripes) make extensive use of stumps and dead snags for nest sites. Nest densities in timbered habitats compared favorably with those in untimbered habitats. Nest success was generally higher...

An analysis was made of eight insecticide residues in the renal fat tissue of 23 white-tailed deer (Odocoileus virginianus), 13 mule deer (O. hemionus), 9 pronghorns (Antilocapra americana), and 2 elk (Cervus canadensis) collected in South Dakota during the fall of 1964. Identification and quantitative analysis of the insecticide residues...

The Geological Survey has been the foremost agency in the investigation of ground‐water resources in the United States beginning about 1910. Most of the basic principles of modern ground‐water hydrology were developed in the Survey's program of cooperative investigations. Use of ground water in the United States in 1960 was about 17½ percent of all water uses, excluding water power. The use will probably increase, though at a decreasing rate. Although amount of use may level off, the...

The Geological Survey has been the foremost agency in the investigation of ground‐water resources in the United States beginning about 1910. Most of the basic principles of modern ground‐water hydrology were developed in the Survey's program of cooperative investigations. Use of ground water in the United States in 1960 was about 17½ percent of all water uses, excluding water power. The use will probably increase, though at a decreasing rate. Although amount of use may level off, the...

Recently determined lead-alpha and potassium-argon ages from northern southeastern Alaska indicate major plutonic events in the Paleozoic, Mesozoic, and Tertiary; in contrast, previous studies suggested that only one complex Jurassic and Cretaceous event occurred. The ages presented in this paper indicate the following Mesozoic and Tertiary plutonic events: Middle or...

No abstract available. ...

No abstract available. ...

No abstract available. ...

Valley City, North Dakota, has an average daily water use of 750,000 gallons, which is obtained from wells tapping pattly confined gravel deposits in the Sheyenne River valley. These deposits at Valley City have a maximum thickness of more than 50 feet and an areal extent of approximately 1 square...

The Harney Lake and Malheur Lake candidate areas are in the Malheur National Wildlife Refuge, north-central Harney County, Oreg. The two areas occupy the shallow center of the Harney Basin, a broad structural and physiographic depression filled by several varieties of silicic to mafic volcanic rocks, sedimentary rocks, and unconsolidated...

During a study of hypogene manganese minerals, three silver-bearing manganese oxides were identified in "black calcite" associated with silver ores at the Aurora mine (Treasure Hill), Hamilton, Nevada. Specifically these are: (1) argentian chalcophanite (aurorite) (Ag 2 Ba,Ca,Pb,-K 2 ,Cu,Mn (super +2) )Mn 3 (super +4) O 7 . 3H 2 O; (2) argentian todorokite (Ag 2 ,K 2 ,Ca,Ba,-Na 2 ,Cu,Pb)Mn 4 (super +4) O 9 . 5H 2 O; and...

In the southwest part of the Liberty pit a large porphyry body exhibits a zonal alteration pattern related to fissures and pyrite-bearing veins. The outermost zone contains unaltered K-feldspar, kaolinite after plagioclase, and black biotite after hornblende. An intermediate zone contains reconstituted K-feldspar, phlogopitic biotite, and muscovite or muscovite plus...

Betweeen the northwest-trending Sierra Nevada and the north-northeast-trending ranges that characterize most of the Great Basin section of the Basin and Range province is a belt of confused and divergent topographic forms, which is approximately 50 miles wide and 300 miles long. Along the eastern part of this belt is...

On eruption, the tholeiitic basalt lava of the prehistoric Makaopuhi lake contained nearly seven percent euhedral olivine phenocrysts of approximately Fa14 composition. In the center of the 225 foot vertical section of the lake, the lava became more than 90 percent solid at 1000° C after about 30 years. At the...

Graphs and tables obtained from continuous records of surface-water temperature from five stations for the period july 1963 through December 1965 and of surface, salinity, dissolved oxygen, turbidity, tide-stage, wind data and bottom temperature from a single station are presented herein. Effects of powerplant cooling water on water temperature were...

Prospecting for gold is something that probably everyone dreams of trying at least once. To the person who is mainly concerned with this activity as a vacation diversion, prospecting offers a special excitement. There is a constant hope that the next pan of sediment may be "pay dirt," and no...

The Flattery Rocks, Quillayute Needles, and Copalis National Wildlife Refuges lie off the Pacific coast of the Olympic Peninsula between Cape Flattery and Grays Harbor. They have a total land area of 247 acres and consists of numerous small islands, sea stacks and rocks that rise above a wave-cut platform....