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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,550 documents.
ENVIRONMENT OF DEPOSITION OF AN ANCIENT DELTA: The Bluejacket Formation in Northeastern Oklahoma
Sandro Saitta Bertoni
Asociación Venezolana de Geología, Minería y Petróleo (AVGMP)
... FIGURE 14 124 FIGURE 15 125 FIGURE 16 curve of grain size distribution for samples with skewness varying between + .10 phi and - .10 phi...
1969
Depth distribution of benthic foraminifera in the middle and deeper sublittoral to uppermost bathyal zones northwest of Okinawa, Japan
Wan Nurzalia Wan Saelan, Johann Hohenegger
Geological Society of Malaysia (GSM)
... signalizes intensities of left (y > 1) or right side (y < 1) skewness. Values of the power factor higher than 1.5 or less than 0.1 indicate significant...
2018
Petrology and Origin of the Lower Tertiary Formations of New Jersey
John K. Adams
Journal of Sedimentary Research (SEPM)
...------------------------ They include: median (Md), sorting (So), and skewness (Sk) and they are based on quartile measures taken from the cumulative curves...
1963
Petrology of the Paleocene-eocene Aquia Formation of Virginia, Maryland, and Delaware
John W. Drobnyk
Journal of Sedimentary Research (SEPM)
.... Also, exposures form the lower part of the formation show poorer average sorting than exposures from the upper part. Skewness values range from a low...
1965
Characteristics of the Stanniferous Alluvium in the Southern Kinta Valley, West Malaysia
Roger A. Newell
Geological Society of Malaysia (GSM)
... to be associated with coarse mean grain size (Mz) and with low or negati ve val ues of skewness (Skl), but the relationships are not silllple and no single...
1971
The Recent Marine Sediments and Pleistocene Surface of Matagorda Bay, Texas
David Bruce Fagg
GCAGS Transactions
... to their median diameter, mean diameter, sorting, and skewness. These four measures are obtained from the cumulative size frequency distribution...
1957
Effects Of Drying Techniques On Grain-Size Analyses of Fine-Grained Sediment
Leslie Keiser, Gerilyn S. Soreghan, Young Ji Joo
Journal of Sedimentary Research (SEPM)
.... Standard statistics (mean, median, mode, skewness, and kurtosis) calculated using the Fraunhofer model associated with the LPSA. All sample means...
2014
Sedimentary Structures and Grain-Size Distribution Mustang Island, Texas
R. J. Moiola , A. B. Spencer
GCAGS Transactions
..., skewness, kurtosis) were calculated using the formulas of Folk and Ward (1957). For convenience, a representative traverse near the center of the island...
1973
Correlation Between Allogenic Grade Size and Allogenic Frequency in Sediments
Percival Allen
Journal of Sedimentary Research (SEPM)
... to impart negative skewness (e.g. garnet fig. 1; and fig. 3 in Allen, 1945) and decomposition positive skewness (e.g. apatite, fig. 1). The third agent far...
1947
Interval Prediction Of Crude Oil Price Using V@R-Asymmetric-Garch Model To Optimize The Petroleum Production Sharing Contract In Indonesia Via Gross Split Method
Marianik, Theoza Nopranda
Indonesian Petroleum Association
... prediction limits. Making a model for non-symmetric data can use the higher moment (third moment) of the distribution called skewness. The negative value...
2022
Biogenic Graded Bedding
Donald C. Rhoads , Daniel J. Stanley
Journal of Sedimentary Research (SEPM)
..., primary and secondary modes, mean, standard deviation ( ), skewness (Sk ), and kurtosis (K ) were obtained by using the Woods Hole Sediment Size...
1965
Reward and Uncertainty in Exploration Programs: Economics of Petroleum Exploration and Production in the Arctic
Paul G. Bradley , Gordon M. Kaufman
AAPG Special Volumes
... 2,000. The observed moments of the outcome distributions are not quite stable--a consequence of the extreme skewness of the distributions. The means...
1973
Modern Marine Carbonate Sediment, Alexander Archipelago, Alaska
Charles M. Hoskin, Richard V. Nelson, Jr.
Journal of Sedimentary Research (SEPM)
.... Skewness is uniformly to the coarse end of the size scale, suggesting that some process has selectively removed fine particles, or alternately, that fine...
1969
Calibration of the University of Southern California Automatically Recording Settling Tube
David O. Cook
Journal of Sedimentary Research (SEPM)
... are a function of sample sorting and skewness, and as such their magnitude is practically impossible to predict. In the past, calibrations of settling tubes have...
1969
Scanning Electron Microscopic Examination of Periglacial Eolian Sands from Long Island, New York: NOTES
David Krinsley, Lillian Cavallero
Journal of Sedimentary Research (SEPM)
... on Friedman's (1961) work which indicates that it is possible to distinguish dune, beach and river sands on the basis of skewness and kurtosis...
1970
Deformation Structures in Siltstone Resulting from the Migration of an Upper Devonian Aeolian Dune
Brian G. Jones
Journal of Sedimentary Research (SEPM)
... ), is moderately sorted (inclusive graphic standard deviation 0.37 ), and is positively skewed (inclusive graphic skewness 0.40). The sandstone differs from...
1972
A Model of Orientation of Subcrystals in Saddle Dolomite
Aleksandra Kostecka
Journal of Sedimentary Research (SEPM)
... the screw-like pattern forces the skewness of the c axes of subcrystals (or vice versa). Although the c axes are skewed, their orientation is ordered (Fig...
1995
Sedimentary Environment and Sediments of Cook Inlet, Alaska
G. D. Sharma , D. C. Burrell
AAPG Bulletin
... and very well sorted. The predominant grain size of Facies 1 is fine sand (0.22 mm) except for sample 35. Most of the samples show positive skewness...
1970
Plate Convergence and Accretion in Taiwan-Luzon Region
Carl Bowin , Richard S. Lu , Chao-Shing Lee , Hans Schouten
AAPG Bulletin
... but shallower crust. Magnetic anomalies in the westernmost Philippine basin suggest the existence of north-trending anomalies. The consistency of the skewness...
1978
The geometry of fluvial channel bodies: Empirical characterization and implications for object-based models of the subsurface
Luca Colombera, Nigel P. Mountney, Giacomo Medici, and L. Jared West
AAPG Bulletin
...) and histograms of skewness in distribution (right-hand side) for morphometric parameters of channel bodies recorded in the Fluvial Architecture Knowledge...
2019
Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin, China
Kelai Xi, Yingchang Cao, Ke Li, Keyu Liu, Rukai Zhu, and Beyene Girma Haile
AAPG Bulletin
... (Rave), maximum pore-throat radius (Rmax), pore-throat sorting coefficient (So), skewness, and so on. In the studied samples, the Rave ranges from...
2020
The taphonomic fidelity of seed size in fossil assemblages: A live-dead case study
Hallie J. Sims, Jason A. Cassara
PALAIOS
... distributions of death assemblage cores. Values of mean, standard deviation, skewness, and kurtosis were calculated from the frequency data for size classes...
2009
Carbonate Sediments of Isla Mujeres, Quintana Roo, Mexico and Vicinity
Robert L. Folk, Miles O. Hayes, Rikii Shoji
New Orleans Geological Society
... in this environment but that they were formed in another environment. The negative skewness is caused by contribution of a subordinate fraction...
1962
New Beach Ridge Type: Severely Limited Fetch, Very Shallow Water
William F. Tanner , Suleyman Demirpolat
GCAGS Transactions
...: The coarser sand has better sorting (numerically smaller), larger positive skewness, larger kurtosis, and a smaller tail of fines than the fine samples...
1988
The Analysis of Stone Size and Shape in Arctic Environments
Cuchlaine A. M. King, Jane T. Buckley
Journal of Sedimentary Research (SEPM)
..., flatness, and sphericity for each of the 50 stones. In addition, it gives the mean, skewness, standard deviation, and kurtosis for each parameter...
1968