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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,705 documents.
Sediments and Sedimentary Structures of the Astoria Submarine Canyon-Fan System, Northeast Pacific
Paul R. Carlson, C. Hans Nelson
Journal of Sedimentary Research (SEPM)
... ar the apex to moderate in the outer reaches of the fan (range 0.4 to 4.0). The skewness of the sand and silt beds is positive, but decreases in value...
1969
Morphology and Hydraulic Significance of Climbing Ripples with Superimposed Micro-Ripple-Drift Cross-lamination in Lower Quaternary Lake Silts, Nebraska
K. O. Stanley
Journal of Sedimentary Research (SEPM)
... 1). These analyses indicate no difference in mean grain size, percentage of sand-size material, skewness, kurtosis, or sorting between the Type...
1974
Depositional Environments, Provenance, and Tectonic Framework: Upper Part of the Late Precambrian Mount Rogers Formation, Blue Ridge Province, Southwestern Virginia
Frederic L. Schwab
Journal of Sedimentary Research (SEPM)
... are angular or subangular; sorting is poorer than for any other sandstone of the upper Mount Rogers and skewness is positive, a characteristic...
1976
Petrology, Transport, and Environment in Isochronous Upper Devonian Sandstone and Siltstone Units, New York
Frank G. Ethridge
Journal of Sedimentary Research (SEPM)
... environments of deposition. Mean, sorting (standard deviation), skewness, and kurtosis values calculated by moments method (Griffith, 1971. v.c.s. = very...
1977
Variations of Sediment Texture on the Amazon Continental Shelf
Charles A. Nittrouer, Mouhab T. Sharara, David J. DeMaster
Journal of Sedimentary Research (SEPM)
... ) show moderate to good sorting, negative to symmetrical skewness, and variable kurtosis. Inner-shelf muds (median grain size 6-9 ) are characterized...
1983
On the Labeling, Length, and Objective Basis of Fischer Plots
P. M. Sadler, D. A. Osleger, I. P. Montanez
Journal of Sedimentary Research (SEPM)
... climates: the majority of years have below-average rainfall. Furthermore, such positive skewness has been found to be typical of bed-thickness...
1993
Fold Geometry Within Part of Michigan Basin, Michigan
E. H. Timothy Whitten , Walter A. Beckman, Jr.
AAPG Bulletin
... the fold axial orientations by factor analysis was described in detail by Whitten (1966a, 1968). The first four statistical moments, the skewness...
1969
Distributional Trends in the Recent Marine Sediments of Tasiujaq Cove of Ekalugad Fiord, Baffin Island, N.W.T.
R. J. Knight
Atlantic Geology
..., with some nearly symmetrical). The continental samples appear negatively skewed (coarse skewed). Skewness appears to be sensitive to environment which...
1971
Ground-Penetrating Radar Study of North Padre Island: Implications for Barrier Island Internal Architecture, Model for Growth of Progradational Microtidal Barrier Islands, and Gulf of Mexico Sea-Level Cyclicity—Discussion
Ervin G. Otvos
Journal of Sedimentary Research (SEPM)
... figures track low wave energy levels and corresponding ridge elevations better than do skewness with the dominance of smaller grains, reduced uniformity...
2011
Using Depletion-Zone Microseismicity to Understand Producing Volumes
Jonathan P. McKenna, Michael H. Grealy, Michael S. Blaz, Nathan M. Toohey
Unconventional Resources Technology Conference (URTEC)
..., and skewness in the same directions (westward for Figure 3B and upward for Figure 3C). Figure 3: A – Map of microseismicity that occurred during...
2016
Rapid Methods of Making Sedimentational Analyses of Arenaceous Sediments
Willard D. Pye
Journal of Sedimentary Research (SEPM)
.... Therefore, it follows that at least one of the parameters must change. However, the effect of skewness is not great unless the skewness is extreme. Assuming...
1943
A Rapid Substitute for Textural Analysis
Irving Sherman
Journal of Sedimentary Research (SEPM)
... on the particular clay minerals present. If the samples are reasonably uniform with respect to sorting coefficients, skewness, and organic content, good...
1951
Student Operator Error in Determination of Roundness, Sphericity, and Grain size
Robert L. Folk
Journal of Sedimentary Research (SEPM)
..., standard deviation of roundness, roundness skewness, and roundness kurtosis can then be determined by the standard intercept techniques of cumulative curve...
1955
Distinction of Shoreline Environments in New Jersey
Edwin W. Biederman, Jr.
Journal of Sedimentary Research (SEPM)
... the four environments. The skewness of grain size distributions (a-axis of quartz grains in phi) changes from negative to positive from beach to lagoon...
1962
Systematic Fractionation of Sand in the Shallow Marine and Beach Environment Off the South African Coast
Arthur O. Fuller
Journal of Sedimentary Research (SEPM)
... of the data is suggestive. Folk and Ward (1957) present an interesting discussion of their data relating to the origin of distinctive skewness...
1962
Radiocarbon Dating of Size Fractions of a Sample of Bahama Carbonate Sediment
Keith A. Kvenvolden
Journal of Sedimentary Research (SEPM)
..., and a coefficient of skewness (Sk) = 0.66. For the purpose of this report radiocarbon ages were determined for the following fractions of carbonate material: (1...
1965
Statistical Application of Plagioclase Extinction in Provenance Studies: NOTES
I. F. Ermanovics
Journal of Sedimentary Research (SEPM)
... with an overly strong skewness of the frequency distribution to the left. Closer study, however, indicated that the mode of granite 3 was due to incomplete...
1967
The Texture of Talus in Tasmania
N. Caine
Journal of Sedimentary Research (SEPM)
... appears somewhat better sorted than that higher upslope but this, too, is not significant. Skewness and kurtosis values for the size distribution curves...
1967
A Florida Sabellariidae Reef and its Effect on Sediment Distribution
Ralph Gram
Journal of Sedimentary Research (SEPM)
... of the lesser worm population. Other Sediment Parameters In an attempt to evaluate the samples more fully, the sorting, skewness, and kurtosis were...
1968
The Origin and Destruction of Armored Mud Balls in a Fresh-water Lacustrine Environment, Lake Superior: NOTES
A. B. Dickas, W. Lunking
Journal of Sedimentary Research (SEPM)
... Series Sieves, and a histogram was constructed (fig. 4). The size distribution of this 'armor' residue shows a negative skewness and a size range...
1968
Porosity and Permeability of Unconsolidated, Upper Miocene Sands From Grain-size Analysis
Norman R. Morrow, John D. Huppler, A. Barlow Simmons, III
Journal of Sedimentary Research (SEPM)
...-end skewness. Two size distribution curves plotted on Rosin-Rammler paper are shown in figures 3 and 4. These curves are typical of most of the data...
1969
Rock Texture: An Important Factor For Clast Shape Studies: NOTES
Lon D. Drake
Journal of Sedimentary Research (SEPM)
... and their frequency distribution summarized in terms of mean, standard deviation, skewness and kurtosis. RESULTS All means of the Zingg ratios for each...
1970
A Settling Tube For Sand-size Analysis
Ronald J. Gibbs
Journal of Sedimentary Research (SEPM)
...: (1) The mean, standard deviation, skewness, and kurtosis can be calculated during analy is with printout immediately following analysis. (2...
1974
Sources and Petrology of Beach Sand from Southern Monterey Bay, California
Rodney A. Combellick , Robert H. Osborne
Journal of Sedimentary Research (SEPM)
... split was shaken for 15 min in a stack of sieves representing 0.5 intervals. Mean phi, phi standard deviation, phi skewness, and phi kurtosis were...
1977
A Visual Comparator for Degree of Sorting in Thin and Plane Sections: DISCUSSION
Charles F. Mansfield
Journal of Sedimentary Research (SEPM)
... parameters (i.e., mean, median, sorting, skewness, and kurtosis) calculated on the basis of individual abundance differ from those calculated...
1985