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Page 6362, results 159026 - 159050

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Not all publications have extents, not all extents are completely accurate
Geology and ground-water resources of Puerto Rico
Charles Lee McGuinness
1947, Economic Geology (42) 563-571
Puerto Rico, the easternmost and smallest of the Greater Antilles, has an axis of deformed and metamorphosed volcanic rocks of Upper Cretaceous age, intruded by dioritic rocks during the Antillean revolution. The hard-rock core is flanked on the north and south by limestones and clastic rocks of late Oligocene and...
Radioactivity of the rocks of the batholith of southern California
Esper S. Larsen Jr., N.B. Keevil
1947, GSA Bulletin (58) 483-494
Determination of radioactivity has been made on 43 rocks, carefully selected from the different mapped units of the complex Cretaceous batholith of Southern California; they range from gabbro to granite. The activity of the gabbro averages about 0.3 alphas/mg./hr., that of the tonalites, 0.8, the granodiorite 1.3, and the granites...
Petrology and structure of the Moa Chromite district, Oriente Province, Cuba
P. W. Guild
1947, Eos, Transactions, American Geophysical Union (28) 218-246
Chromite deposits In the Moa district, on the north coast of Oriente Province, Cuba, form one facies of the ultramafic complex in which they occur. Two planar structures, one a compositional layering due to variations in the relative proportions of olivine, pyroxene, plagioclase feldspar, and chromite, and the other a...
Present investigations of radioactive raw materials by the Geological Survey and a recommended program for future work
A.P. Butler Jr., F.W. Stead
1947, Trace Elements Investigations 36
The Geological Survey's program of investigation of radioactive raw materials is presented herewith under present investigations, plans for future investigations, plan of operation, and cost of operation. This report was prepared at the request of the Atomic Energy Commission. Present investigations are summarized to show the scope of the present Trace...
Geology and ground-water resources of the island of Niihau, Hawaii
Harold T. Stearns, Gordon A. Macdonald
1947, Bulletin 12
Niihau lies 171/2 miles southwest of Kauai. Its area is 72 square miles, and its highest point has an altitude of 1,281 feet. The population is about 180, chiefly Hawaiians. The annual rainfall at Kiekie, the ranch headquarters, generally ranges between 18 and 26 inches. The chief industries are the...
Geology and ground-water resources of the island of Molokai, Hawaii
Harold T. Stearns, Gordon A. Macdonald
1947, Bulletin 11
The island of Molokai is the fifth largest of the Hawaiian Islands, with an area of 250 square miles. It lies 25 miles southeast of Oahu, and 8.5 miles northwest of Maui. It consists of two principal parts, each a major volcanic mountain. East Molokai rises to 4,970 feet altitude....
Geology of San Antonio Canyon, California, in relation to ground-water storage
P. Eldon Dennis
1947, Open-File Report 47-33
At least two periods of relative stability in the history of the erosion of San Antonio Canyon are indicated by the bench-like features produced by the laterally cutting stream and by the remnants of older alluvium left by the stream when it was cutting at these higher levels. In addition,...
The sensitized luminescence of manganese-activated calcite
J.H. Schulman, L.W. Evans, R.J. Ginther, K. J. Murata
1947, Journal of Applied Physics (18) 732-739
Synthetic manganese-activated calcites are shown to be practically inert to ultraviolet excitation in the range 2000-3500A, while they are luminescent under cathode-ray excitation. The incorporation of small amounts of an auxiliary impurity along with the manganese produces the strong response to ultraviolet radiation hitherto ascribed to CaCO3:Mn itself. Three such...
Mortality of smelt, Osmerus mordax (Mitchill), in Lakes Huron and Michigan during the fall and winter of 1942-1943
John Van Oosten
1947, Transactions of the American Fisheries Society (74) 310-337
The mortality that nearly exterminated the huge stocks of smelt in Lakes Huron and Michigan during the fall and winter of 1942–1943 appears to have originated in central Lake Huron in the Saginaw Bay area in late September or early October 1942. The mortality spread rapidly northward reaching the Drummond...
Age and growth of the kiyi, Leucichthys kiyi Koelz, in Lake Michigan
Hilary J. Deason, Ralph Hile
1947, Transactions of the American Fisheries Society (74) 88-142
Ages were determined and individual growth histories were calculated from the examination and measurement of the scales of 1,649 kiyis captured at seven localities in Lake Michigan in 1931 and 1932. The numbers of individuals employed for the investigation of other phases of the life history (such as length-frequency distributions,...
Distribution, abundance, and spawning season and grounds of the kiyi, Leucichthys kiyi Koelz, in Lake Michigan
Ralph Hile, Hilary J. Deason
1947, Transactions of the American Fisheries Society (74) 143-165
From May to November, inclusive, the kiyis of southern Lake Michigan (north to and including localities off Kewaunee, Wisconsin, and Frankfort, Michigan) characteristically inhabit depths of more than 50 fathoms, although small numbers commonly are taken in shallower water (as shallow as 20 29 fathoms). There is evidence that the...