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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,689 documents.
The Nature and Origin of Argentine Loess
Mario E. Teruggi
Journal of Sedimentary Research (SEPM)
... to 2.21. No significant differences exist in the values of phi skewness (Sk) and phi standard deviation (), though the latter is generally larger...
1957
Permo-Pennsylvanian Paleogeography of Part of Oklahoma
William F. Tanner
Journal of Sedimentary Research (SEPM)
..., obtaining for 214 samples median diameter, sorting, skewness, and heavy mineral counts. For the area studied, he reported median diameter of 0.150 mm, So=1.20...
1959
Resource Assessment and Profitability from Discovery Rate Forecasting
Konstantinos Zorbalas, Rudy E. Rogers
GCAGS Transactions
... like the historic distribution of fields, but it is skewed in the opposite direction. The skewness is to the left side because in nature...
1993
Improved TOC and Lithology Prediction for Wolfcamp Shales Using AVO Attribute Analysis
Jaewook Lee, Un Young Lim, David Lumley
Unconventional Resources Technology Conference (URTEC)
... on the two most important factors are TOC and Vclay. These variables are normally distributed with weak skewness, enough to meet the assumption...
2020
A Numerical Method for Sandstone Classification
Sam Boggs, Jr.
Journal of Sedimentary Research (SEPM)
... member in greater detail, or to express factors such as mean roundness, mean grain size, standard deviation (sorting), and skewness that would have...
1967
Anatomy of a Nearshore Mixed Siliciclastic-Carbonate Deposit, the Plio-Pleistocene of Southern Broward County, Florida
Thomas M. Missimer, Robert G. Maliva, Charles W. Walker, Elizabeth Owosina
GCAGS Transactions
...: mean grain diameter, standard deviation, skewness, kurtosis, 5th moment, 6th moment, and relative dispersion. Thin sections were made from core...
2000
Geological and Mineralogical Studies of Some Sand Deposits in the Nile Delta, U.A.R.
M. M. Kholief, E. Hilmy, A. Shahat
Journal of Sedimentary Research (SEPM)
..., quartiles, percentiles, coefficient of sorting, skewness, kortusis and arithmetic quartile deviation are given in table 1. From the mechanical analysis...
1969
Particle Shape: Classification of Thickness Using Slotted Screens
John C, Ludwick
Journal of Sedimentary Research (SEPM)
..., =2, which yields a distribution slightly skewed in the direction of the modal distribution. The skewness relationships are evident in the data...
1971
Sedimentary Components of Northwest Pacific Pelagic Sediments
Robert K. Oser
Journal of Sedimentary Research (SEPM)
... deviation, skewness, and kurtosis of a distribution are used as measures of the average grain size, particle size dispersion, asymmetry, and peakedness...
1972
Sedimentary History of Central California Shelf Sands as Revealed by Scanning Electron Microscopy
Charles E. Nordstrom, Stanley V. Margolis
Journal of Sedimentary Research (SEPM)
... diagrams of the sorting measure and the skewness measure that illustrate similarities FIG. 1. Index map showing location of the rangeline across...
1972
Surf Zone Shape Changes in Quartz Grains on Pocket Beaches, Cape Arago, Oregon
C. J. F. Rottmann
Journal of Sedimentary Research (SEPM)
... for the separate environments are tabulated in Table 3. The beta statistics, measures of skewness and kurtosis, show no significant departures from the accepted...
1973
The Problem of Beach Cusp Development
A. T. Williams
Journal of Sedimentary Research (SEPM)
...-sample test, for N = 25 for mean size, standard deviation, skewness and kurtosis were 90.01, 90.01, 70.05, and 4NS respectively, which conclusively shows...
1973
Deltaic Depositional Environments in the Hamilton Group (Middle Devonian), Southeastern New York State
S. J. Mazzullo
Journal of Sedimentary Research (SEPM)
... (Mz), Inclusive Graphic Standard Deviation (SI) and Graphic Skewness (SKg) were computed in order to illustrate grain size parameters in each...
1973
Texture of Tills, Central Massachusetts
James W. Mulholland
Journal of Sedimentary Research (SEPM)
... tills appear to contain more stones), skewness changes from fine skewed to coarse skewed upward, and the sand + silt/clay ratio increases upward...
1976
Landward Migration of Barrier Island Sands Under Stable Sea Level Conditions: Plum Island, Massachusetts
J. Richard Jones, Barry Cameron
Journal of Sedimentary Research (SEPM)
...). The raphic mean, inclusive graphic standard deviation, inclusive graphic skewness, and graphic kurtosis were calculated from appropriate values...
1977
Ebb-Tidal Delta Morphology and Sediment Supply in Relation to Seasonal Wave Energy Flux, North Inlet, South Carolina
Robert J. Finley
Journal of Sedimentary Research (SEPM)
... with coastal weather conditions would show strong positive skewness due to the inclusion of storm events. The conditions at the low-frequency, high-energy...
1978
Patterns of Quartz Sand Shape Variation, Long Island Littoral and Shelf
Debra D. Riester , R. Craig Shipp , Robert Ehrlich
Journal of Sedimentary Research (SEPM)
... were determined from each sample. They also observed changes that occurred at a depth of about 50 m--an increase in skewness FIG. 3. Outlines...
1982
On Using The Log-hyperbolic Distribution To Describe The Textural Characteristics Of Eolian Sediments
K.-H. Wyrwoll , G. K. Smyth
Journal of Sedimentary Research (SEPM)
...., Mechanics of Sediment Transport: Rotterdam, A. A. Balkema, p. 55-64. BINDA, P. L., 1983, On the skewness of some eolian sands from Saudi Arabia, in Brookfield...
1985
Modern Examples of Beach Sands: Chapter 4
Daniel A. Busch
AAPG Special Volumes
... and little skewness. ... All samples contain significant quantities of apatite. An analysis of the lagoon arrier sand made by a mining company revealed...
1974
Effects of Tropical Weathering on Quartz Grain Shape: an Example from Northeastern Australia
Kenneth Pye , Jim Mazzullo
Journal of Sedimentary Research (SEPM)
... a greater tendency for positive skewness than the parabolic dune sands. The grain size of the A2 horizon sands from the older generation of parabolic dunes...
1994
Tidal Lagoon Sediments on the Mississippi Delta: Part 3. Deposits Associated with Strand Line
W. C. Krumbein
AAPG Special Volumes
..." values, the skewness, the carbon content, and the like. Figure 7 is the frequency curve of the phi medians of all samples, obtained by the graphic...
1939
A Crystal Growth Rate Equation for Ancient Dolomites: Evidence for Millimeter-scale Flux-limited Growth
Stephan H. Nordeng , Duncan F. Sibley
Journal of Sedimentary Research (SEPM)
... found in this study. Therefore, this model can explain the coarse-skewness of many ancient dolomite crystal size distributions (Sibley et al. 1993...
1996
Carbonate Grain-Size Distribution in Hemipelagic Sediments from a Laser Particle Sizer: RESEARCH METHODS PAPERS
Alain Trentesaux, Philippe Recourt, Viviane Bout-Roumazeilles, Nicolas Tribovillard
Journal of Sedimentary Research (SEPM)
... identification of the mode, mean, sorting index, or skewness. Figure 2 illustrates the three curves for a sample from the Northern Atlantic Ocean. APPLICATION...
2001
Three-Dimensional Trend Mapping Using Gamma-Ray Well Logs: Simpson Group, South-Central Kansas
J. H. Doveton , Zhu Ke-an , J. C. Davis
AAPG Bulletin
... of skewness, which expresses the direction and degree of asymmetry of a distribution. The fourth moment expresses kurtosis, or the relative "peakedness...
1984
Improved Statistical Method for Assessment of Undiscovered Petroleum Resources
David J. Forman, Alan L. Hinde
AAPG Bulletin
... spaced about the average for each discovery number. This and the near-zero values of skewness and kurtosis for the log field size distributions indicate...
1985