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Page 5969, results 149201 - 149225

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Placer gold occurrences in Alaska
Edward Huntington Cobb
1964, Mineral Investigations Resource Map 38
The following references give data on localities of placer gold by quadrangle and are keyed by number within each quadrangle to locations shown on map. The quadrangle boundaries and names used on the map are those selected by the U. S. Geological Survey for topographic mapping in Alaska on a...
Topographic mapping: A challenging future
U.S. Geological Survey
1964, Report
The United States Geological Survey was established by Congress in 1879 to make a systematic study of the geology and natural resources of the United States. To provide the essential base maps for these studies, the Survey immediately began a program of topographic mapping. In 1882 a general plan was adopted for a standard series...
Surface water records of Indiana, 1964
Water Resources Division, U.S. Geological Survey
1964, Report
The surface-water records for the 1964 water year for gaging stations, partial-record stations, and miscellaneous sites within the State of Indiana are given in this report. For convenience there are also included records for a few pertinent gaging stations in bordering States. The records were collected and computed by the...
Late quaternary sea-level change and crustal rise at Boston, Massachusetts, with notes on the autocompaction of peat
C. A. Kaye, E.S. Barghoorn
1964, Geological Society of America Bulletin (75) 63-80
The compression of peat beneath its own weight (autocompaction) is discussed, and it is shown that because of this process radiocarbondated samples of salt-marsh peat or peaty sediment, other than very thin samples cut from the base of the deposit, cannot be correlated with sea level without construction of a...
Boulder train of silicified paleozoic wood, southeastern Massachusetts
C. A. Kaye
1964, Geological Society of America Bulletin (75) 233-236
Pebbles of silicified gymnospermous wood occur widely in the drift of southeastern Massachusetts. An investigation of the distribution of these pebbles shows the bedrock source of the wood to be tuffaceous beds that apparently overlie older granite in the Middleboro-Plympton area, Massachusetts, and are at the base of the Carboniferous...
Exploration for mineral deposits in White County, Georgia
Vernon J. Hurst
1964, Report
White County is in the Northeast Georgia Highland. It comprises 243 square miles and has abouit 7,000 Inhabitants. The county seat is Cleveland.Although the scene of considerable mining activity in the past, White County now has few operating mines: a small production of clay1 for the manufacture of miscellaneous potter...
Low-amplitude aeromagnetic anomalies in Southeastern Missouri
J.W. Allingham
1964, Geophysics (29) 537-552
This study shows that aeromagnetic anomalies of less than 200 gammas are associated with topographic relief of exposed Precambrian granitic and volcanic rocks of the St. François Mountains. Anomalies resulting from hills coarsely crystalline granite are as high as 100 gammas in amplitude, whereas anomalies over comparable hills of fine-grained rocks, such as granophyre or devitrified volcanic rock, are...
Principal features and origin of podiform chro-mite deposits, and some observations on the Guleman-Soridag District, Turkey
T. P. Thayer
1964, Economic Geology (59) 1497-1524
Podiform chromite deposits occur in alpine peridotite and mafic complexes and fundamentally are tabular, pencil-shaped, or irregular in form. The chromite characteristically is anhedral and commonly shows effects of granulation and magmatic corrosion. Flow-layering, foliation, and lineation are parallel in most chromite deposits and peridotite host rocks, and normally pass through major...
Paleo-channels at the Guayacan copper mine, Cabildo District, Aconcagua Province, Chile
W. D. Carter, T. Aliste Nelson
1964, Economic Geology (59) 1283-1292
An uneven erosion surface separates calcareous sedimentary rocks above and vesicular andesite porphyry below at the Guayacan mine of central Chile. Channel-like depressions filled with sedimentary rock flank elongate, stratiform bodies of disseminated copper ore which impregnate the vesicular crests of andesite lava flows. The "channels" lie parallel to and mark the margins of tongues of lava. Erosional features...
Supergene iron ores of minas Gerais, Brazil
J. V.N. Dorr II
1964, Economic Geology (59) 1203-1240
The iron ores of Minas Gerais, Brazil, fall into two categories: (1) hypogene hematite ore averaging 66 percent or more Fe, and (2) lower-grade supergene ores. Most ore now extracted is high-grade hypogene ore; lower-grade supergene ores will be of much future value. All supergene ores formed by weathering of itabirite, a metamorphosed oxide-facies iron formation averaging about 38 percent Fe and 44 percent Si02. The Caue Itabirite crops out for...