Smithsonian Contributions to the Earth Scienceshttps://hdl.handle.net/10088/7972024-03-29T12:02:21Z2024-03-29T12:02:21ZDistribution of <i>Echinarachnius parma</i> (Lamarck) and Associated Fauna on Sable Island Bank, Southeast CanadaStanley, Daniel J.James, Noel P.https://hdl.handle.net/10088/8332023-09-08T01:31:09Z1971-01-01T00:00:00ZDistribution of <i>Echinarachnius parma</i> (Lamarck) and Associated Fauna on Sable Island Bank, Southeast Canada
Stanley, Daniel J.; James, Noel P.
A combined bottom photographic and sampling survey of Sable Island Bank southeast of Nova Scotia, Canada, reveals locally high densities (to 180 individual/m<sup>2</sup>) of the northern sand dollar <i>Echinarachnius parma</i>. Populations of this form are closely related to texture of the sea floor and generally concentrated on moderately sorted fine to medium sand surfaces. Topography and current regime are also correlatable factors; depth, time, salinity, and temperature apparently are not. Sand dollars are second in importance, after current activity, in reworking surficial sediments, and these organisms modify at least a third of the total Bank surface in the study area. Bioturbation is particularly intense in the sector north of Sable Island. Associated epifauna and infauna populations occur in two east-west trending areas on the Bank north and south of Sable Island. Absence of conspicuous fauna, save <i>E. parma,</i> in an east-west zone along the crest of the Bank and near Sable Island results from extremely strong current activity concentrated in this region.
1971-01-01T00:00:00ZCatalog of Meteorites from Victoria Land, Antarctica, 1978-1980Marvin, Ursula B.Mason, Brianhttps://hdl.handle.net/10088/8322023-10-26T12:10:29Z1982-01-01T00:00:00ZCatalog of Meteorites from Victoria Land, Antarctica, 1978-1980
Marvin, Ursula B.; Mason, Brian
This is the second catalog of meteorite specimens collected on expeditions to Victoria Land led by William A. Cassidy of the University of Pittsburgh. The first (Catalog of Antarctic Meteorites, 1977-1978, U. B. Marvin and B. Mason, editors, 1980) presented the results of the 1976-1977 and 1977-1978 field seasons and described the collection and curation procedures that were adopted under a three-agency agreement between the National Science Foundation, the National Aeronautics and Space Administration, and the Smithsonian Institution for the purpose of protecting the meteorites from terrestrial contamination and allocating them for research. This catalog reports the results of the subsequent two seasons: 309 specimens were collected in 1978-1979, and 73 in 1979-1980. Classifications are given for all specimens weighing more than about 100 grams and also for some smaller pieces from each of the four field seasons. The catalog describes the field camps, the geodetic measurements of ice motion and ablation at the Allan Hills site, and the search for new concentrations. Current information about the character of the collections and new types of meteorites represented in them is outlined in brief articles describing Antarctic achondrites, carbonaceous chondrites and irons, and meteorite weathering and terrestrial residence times on the polar icecap. There is a bibliography of major articles on Antarctic meteorites. An Appendix lists all of the Victoria Land specimens classified as of December 1980, by numerical order for each locality and by meteorite class.
1982-01-01T00:00:00ZMineral Sciences Investigations 1976-1977Fudali, Robert F.https://hdl.handle.net/10088/8312023-11-03T01:30:58Z1979-01-01T00:00:00ZMineral Sciences Investigations 1976-1977
Fudali, Robert F.
This volume is comprised of six short contributions reporting the results of some of the research carried out by the Department of Mineral Sciences, Smithsonian Institution, during the period 1976-1977. Included are: a comparison of impact breccias and glasses from Lonar Crater (India) with very similar specimens from the moon; petrographic descriptions and chemical analyses of virtually all the known pyroxene-plagioclase achondrite meteorites and a discussion of the relationships within this class; a comparative chemical study of sixty Australian tektites from widely separated localities; a description of a new, rapid technique of sample preparation for whole-rock analyses using the electron microprobe; an interlaboratory comparison of the precision and accuracy of electron microprobe analyses; and a tabulation of the chemical compositions of some electron microprobe reference samples.
1979-01-01T00:00:00ZMineral Sciences Investigations, 1972-1973Switzer, George S.https://hdl.handle.net/10088/8302024-02-14T21:10:06Z1975-01-01T00:00:00ZMineral Sciences Investigations, 1972-1973
Switzer, George S.
Thirteen short contributions from the Smithsonian&apos;s Department of Mineral Sciences for 1972 and 1973 are gathered together in this volume. Scientific contributions include new data on some mercury minerals from Terlingua, Texas; a description of dashkesanite from St. Paul's Rocks; a note on high-alumina basalt from the Aleutian Trench; descriptions of samples from the Apollo 15 and 16 lunar missions; chondrule composition of the Allende meteorite; the Pulsora meteorite and metamorphic equilibration in chondrites; the possible survival of very large meteorites that encounter the earth's surface; data on eight observed-fall chondritic meteorites; chemical analyses of two microprobe standards; and a technological note on the preparation of multiple microprobe samples. A history of mineral sciences in the Smithsonian Institution and a list of meteorites in the Smithsonian collections complete the volume.
1975-01-01T00:00:00Z