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Showing 3,218 Results. Searched 200,619 documents.
Small-Scale Structures and Other Features of Navajo Sandstone, Northern Part of San Rafael Swell, Utah
George A. Kiersch
AAPG Bulletin
..., such as pebbles along cross-bedding planes,(FOOTNOTE 9) spherical weathering, and abundant fracture fillings. The thickness of the Navajo sandstone...
1950
Supratidal Environment and Geochemistry of Some Recent Dolomite Concretions, Broad Sound, Queensland, Australia
Peter J. Cook
Journal of Sedimentary Research (SEPM)
... and large gypsum crystals form just below the surface. Interstitial pore waters are hypersaline, with salinities in excess of 120 ppt being recorded...
1973
The Development of Rodriguez Bank, a Holocene Mudbank in the Florida Reef Tract
R. J. Turmel, R. G. Swanson
Journal of Sedimentary Research (SEPM)
... to central Florida and from the Gulf of Mexico to the easternmost Bahama Islands. The total section is in excess of 14,000 ft (4,267 m) (Goodell...
1976
Two New Methods of Paleocurrent Determination from Trough Cross-Stratification
Peter G. DeCelles, Richard P. Langford, Robert K. Schwartz
Journal of Sedimentary Research (SEPM)
... as a skewed distribution of poles or in the field as an excess of either left-hand or right-hand limbs. If only scour bases are measured, asymmetric...
1983
Origin and Significance of Complex Authigenic Carbonates in Cretaceous Black Shales of the Western Alps
Normand Tasse, Reinhard Hesse
Journal of Sedimentary Research (SEPM)
... in the black shales as 1) laminae less than 5-6 mm thick; 2) spherical or ellipsoidal nodules less than a few centimeters in diameter; and 3) authigenic layers 4...
1984
Isotopic Variations in Dolomite Concretions from the Monterey Formation, California
Joel Hennessy , L. Paul Knauth
Journal of Sedimentary Research (SEPM)
... of each sample was reacted under vacuum at 25.2°C with an excess of 100% phosphoric acid (about 2.5 ml) for at least three days. The evolved CO2 gas...
1985
"Glauconite" Pellets: Their Mineral Nature and Applications to Stratigraphic Interpretations
John F. Burst
AAPG Bulletin
...) as a description for a blue-green micaceous mineral, this word is now widely used as a morphological term for small, spherical, green, earthy pellets. By X-ray...
1958
Diagenesis of Plio-Pleistocene Sediments of the Colorado River Delta, Southern California
Scott Jennings, Graham R. Thompson
Journal of Sedimentary Research (SEPM)
... spherical diameter size fractions by repeated centrifugation. The less than 0.1µm fraction was separated from the greater than 2-µm fraction for the Borchard...
1986
Accumulation of Fine-Grained Sediments in a Periodically Energetic Clastic Environment, Cape Lookout Bight, North Carolina
John T. Wells
Journal of Sedimentary Research (SEPM)
...), extended floods (missed ebbs) are also possible if winds blow from the northwest in excess of 10 m/sec (20 kt). The implications in either case are 1...
1988
Diagenetic Siderite and Other Ferroan Carbonates in a Modern Subsiding Marsh Sequence
Sarah E. Moore , Ray E. Ferrell, Jr., Paul Aharon
Journal of Sedimentary Research (SEPM)
... % of the underlying freshwater sequence of overbank and interdistributary lake sediments. 14C dating of basal peats and shell material from depths in excess of 8 m...
1992
Replacement of Aragonite by Quasi-Rhombohedral Dolomite in a Late Pleistocene Tufa Mound, Great Salt Lake, Utah, U.S.A.
Vicki A. Pedone , J.A.D. Dickson
Journal of Sedimentary Research (SEPM)
... with 7 to 10 mole % excess Ca, but also poorly ordered. MINOR ELEMENTS Table 3 shows the electron-microprobe analyses for aragonite cement and micrite...
2000
Pleistocene Dolomite from the Namibian Shelf: High 87Sr/86Sr and 18O Values Indicate an Evaporative, Mixed-Water Origin
John Compton, Chris Harris, Simon Thompson
Journal of Sedimentary Research (SEPM)
... pods (Fig. 4A, B). Electron microprobe analysis indicates that the dolomite is calcian with an average of 3 mol % excess Ca and is low in Fe (< 1 mol...
2001
Geophysical Studies of Basement Geology of Southern Peninsula of Michigan
William J. Hinze , Richard L. Kellogg , Norbert W. O'Hara
AAPG Bulletin
... of the main geomagnetic field from spherical harmonic expansions: NASA Data Users Note NSSDC 68-11, 45 p. Cohee, G. V., 1945, Sections and maps, Lower...
1975
High-Porosity Cenozoic Carbonate Rocks of South Florida: Progressive Loss of Porosity with Depth
Robert B. Halley, James W. Schmoker
AAPG Bulletin
... of Pleistocene limestones. It avoids problems associated with mass-balance calculations and the source of "excess" cement encountered by Steinen (1974...
1983
Porosity Enhancement from Chert Dissolution Beneath Neocomian Unconformity: Ivishak Formation, North Slope, Alaska
G. Shanmugam , J. B. Higgins
AAPG Bulletin
... chert with spherical quartz crystals (B). End_Page 529------------------------------ presence of sulfur-bearing organic material (Lerbekmo and Platt...
1988
Recognition criteria for distinguishing between hemipelagic and pelagic mudrocks in the characterization of deep-water reservoir heterogeneity
Jesus Ochoa, Jeannette Wolak, Michael H. Gardner
AAPG Bulletin
... by an excess in pyrite resulting from diagenesis. The sample at 12,900.5 ft (Table 2) showed high quartz values associated with diagenetic production...
2013
Effects of SEM Preparation Techniques on the Appearance of Bacteria and Biofilms in the Carter Sandstone
Sarah E. Fratesi, F. Leo Lynch, Brenda L. Kirkland, Lewis R. Brown
Journal of Sedimentary Research (SEPM)
... of the biofilm by washing away this smooth outer layer. Small (50–200 nm) spherical structures are present in all samples but are particularly...
2004
Hot Dry Rock Geothermal Exploration in Australia
R. R. Hillis, M. Hand, S. Mildren, J. Morton, P. Reid, S. Reynolds
Petroleum Exploration Society of Australia (PESA)
... that geothermal gradients there may be in excess of those in the Cooper Basin given circumstances outlined in the thermal modelling presented herein...
2004
The Effects of Grain-Density Variation on Turbidity Currents and Some Implications for the Deposition of Carbonate Turbidites
James M. Hodson, Jan Alexander
Journal of Sedimentary Research (SEPM)
... densities (e.g., Savarese et al. 1996), and particle shape can vary from nearly spherical to highly irregular. Both of these properties influence grain...
2010
Physics of Marine Orogenesis
A. E. Scheidegger
CSPG Bulletin
... of approximately +20 to +30 milligal. (See e.g. Dietrich and Kalle, 1957, p. 23.) This seems to indicate that there is an excess of mass beneath oceans...
1958
A Regional Gravity Survey of the Sanpete-Sevier Valleys and Adjacent Areas in Utah
Robert P. Brown, Kenneth L. Cook
Utah Geological Association
... to be caused by the Arapien Formation and that the excess gradient on the west is caused by a deepening of the Mohorovicic discontinuity east of the Wasatch Line...
1982
Meander Belt Entrapment of Hydrocarbons at Saddle Lake, Alberta and an Untested in Situ Combustion Scheme for Recovery of Heavy Oil
Ralph W. Edie, John M. Andrichuk
CSPG Bulletin
... of the gas cap. Compared with viscous heavy oil, injected oxygen would be expected to preferentially unite with gas cap methane, and the spherical...
2003
Role of Turbidity Currents in Setting the Foreset Slope of Clinoforms Prograding into Standing Fresh Water
Svetlana Kostic, Gary Parker, Jeffrey G. Marr
Journal of Sedimentary Research (SEPM)
... of rivers flowing to the ocean, which has a specific gravity near 1.028, it is necessary to have a suspended sediment concentration in excess of about...
2002
Cementation and Compaction History of Synorogenic Foreland Basin Sedimentary Rocks from Huaco, Argentina
John F. Damanti, Teresa E. Jordan
AAPG Bulletin
... previously. One possibility is that these nonideal sandstones compacted much more rapidly than predicted for spherical well-sorted grains, so...
1989
Thermal Maturation and Organic Richness of Potential Petroleum Source Rocks in Proterozoic Rice Formation, North American Mid-Continent Rift System, Northeastern Kansas
K. David Newell , Robert C. Burruss , James G. Palacas
AAPG Bulletin
.... Pyrite occurs in irregularly shaped patches (20-60 µm in size) or as isolated euhedral crystals (2-3 µm in size). Spherical framboids reported...
1993