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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 196,121 documents.
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Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)
Veerle Vandeginste, Cedric M. John, Tina van de Flierdt, John W. Cosgrove
AAPG Bulletin
... of (1) potential stretching of the fluid inclusions in dolomite (however, no pronounced skewness of the Th distribution, suggesting that stretching...
2013
The magnetic fabric of the Wolfcamp shale, Midland Basin, west Texas: Understanding petrofabric variability, hydrocarbon associations, and iron enrichment
Gerhard W. Heij, and R. Douglas Elmore
AAPG Bulletin
... algorithms can perform poorly when there are outliers in the data, high degrees of collinearity among variables, or high skewness of the clustering variables...
2019
Constraining coalbed methane reservoir petrophysical and mechanical properties through a new coal structure index in the southern Qinshui Basin, northern China: Implications for hydraulic fracturing
Yingjin Wang, Dameng Liu, Yidong Cai, Yanbin Yao, and Zhejun Pan
AAPG Bulletin
... means that coal macrolithotype and cleat spacing essentially control the brittle deformation degree (Su et al., 2001). In Figure 7E, for DDI, skewness...
2020
Central Texas Coast Sedimentation: Characteristics of Sedimentary Environment, Recent History, and Diagenesis: PART 2
Francis P. Shepard, David G. Moore
AAPG Bulletin
... spaced lines from barrier islands into bays. Sorting (^sgr^phgr) and skewness (^agr^phgr) change radically at base of slope, whereas median diameter (Md...
1955
Taphonomy and paleoecology of a bonebed from the Prince Creek Formation, North Slope, Alaska
Roland A. Gangloff, Anthony R. Fiorillo
PALAIOS
... of specimen size classes. A) Histogram for quarry squares AK-284V, AK-490V, AK-531V, and AK-532V fit to normal curve. N 5 725; mean 5 70.02; skewness 5...
2010
Some Problems in Thermal History Studies
David Deming, Jeffrey A. Nunn, Steven Jones, David S. Chapman
Rocky Mountain Section (SEPM)
... in the partial annealing zone, the greater the degree of skewness. A complex cooling history involving a partial thermal overprinting gives a bimodal distribution...
1990
Depositional Environments and Sediments in the Coastal Zone of Prince Edward Island, Canada
Grant A. Bartlett
Atlantic Geology
... median, mean, sorting, skewness and kurtosis. A factor analysis was performed on the total grain-size data and will be presented in a subsequent report...
1977
Secondary Current of Saline Underflow in a Highly Meandering Channel: Experiments and Theory
Jorge D. Abad, Octavio E. Sequeiros, Benoit Spinewine, Carlos Pirmez, Marcelo H. Garcia, Gary Parker
Journal of Sedimentary Research (SEPM)
... coefficients of bend skewness and fatness (Parker et al. 1983). Note that in the limit Js = Jf → 0 the above equation reduces to the equation for a sine...
2011
Controls On the Genesis, Sedimentary Architecture, and Preservation Potential of Dryland Alluvial Successions In Stable Continental Interiors: Insights from the Incising Modder River, South Africa
Stephen Tooth, P. John Hancox, Dion Brandt, Terence S. McCarthy, Zenobia Jacobs, Stephan Woodborne
Journal of Sedimentary Research (SEPM)
... standard deviation (IGSD), and inclusive graphic skewness (IGS). For the four main overbank deposits, the percentage silt and clay content is given...
2013
The Permian Triassic transition in the central coastal plain of Israel (North Arabian Plate Margin), David 1 Borehole
Dorit Korngreen, Olga Orlov-Labkovsky, Or Bialik, Chaim Benjamini
PALAIOS
..., the mode is 4.5 mm, curve kurtosis is about 0.21, and skewness is 0.88. The results indicate that the shale units are in fact composed of very fine...
2013
TAPHONOMIC ANALYSIS OF CAMBRIAN VERMIFORM FOSSILS OF UTAH AND NEVADA, AND IMPLICATIONS FOR THE CHEMISTRY OF BURGESS SHALE-TYPE PRESERVATION
JESSE S. BROCE, JAMES D. SCHIFFBAUER
PALAIOS
... largely overlap (Fig. 7A), but the distribution of fossil points is more right-skewed (skewness ¼ 1.66, versus 0.53 for host rock). Iron and magnesium...
2017
Geology and Physical Properties of Ross Sea, Antarctica, Continental Shelf Sediment
B. D. Edwards, H. J. Lee, H. A. Karl, E. Reimnitz, L. A. Timothy
Circum Pacific Council Publications
...; SD, moment standard deviation; SK, moment skewness; K, moment kurtosis. Figure 5—Line graphs of void ratio vs. log of the average vertical...
1987
Environmental influence on burrow system features of a colonial and fossorial rodent: implications for interpreting fossil tetrapod burrows
M. Cristina Cardonatto, Ricardo Nestor Melchor
PALAIOS
... of distribution Mean (l) Sorting (/) Skewness (/) Kurtosis (/) Puesto La Porf´a ı V541 (~356) Very fine sand unimodal 117.9 0.935 (moderately sorted...
2021
Evaluating the ichnofossil Teredolites as an indicator of salinity and paleoenvironment
R. C. C. Buntin, S.T. Hasiotis, and P. P. Flaig
PALAIOS
.... A and T. longissimus as the degradational state increased from well-preserved to poorly preserved log-grounds. Positive skewness in size-density...
2022
Alluvial Fan Deposits
Tor H. Nilsen
AAPG Special Volumes
..., and skewness toward coarser clasts (Bull, 1972a). Alluvial fans grade laterally into other alluvial fan deposits derived from adjacent feeding streams...
1982
Sediments and History of Holocene Transgression, Continental Shelf, Northwest Gulf of Mexico
Joseph R. Curray
AAPG Special Volumes
..., skewness, and kurtosis is based on the assumption that the End_Page 236------------------------ grain-size distributions approach normality, either...
1960
Impact of diagenesis on the pore evolution and sealing capacity of carbonate cap rocks in the Tarim Basin, China
Jun Wu, Tailiang Fan, Enrique Gomez-Rivas, Anna Travé, Qian Cao, Zhiqian Gao, Shanshan Wang, and Zhihong Kang
AAPG Bulletin
... withdrawal, average pore-throat radius, and skewness. In this study, the threshold capillary pressure, maximum mercury saturation (Smax), and efficiency...
2022
Chapter 12: Mowry Shale–Belle Fourche Shale, Bighorn Basin, Wyoming, USA—A Mesozoic Clastic-Biosiliceous Shelf System: A Prolific Source Rock with Associated Mudstone Reservoir Potential
K. M. Bohacs, O. R. Lazar, R. D. Wilson, J. H. S. Macquaker
AAPG Special Volumes
... of the standard errors), standard deviations, kurtosis, skewness, minima, maxima, and range, whereas the medians (in light of the standard deviations) are rather...
2022
Fluvial Sedimentology: An Historical Review
Andrew D. Miall
Dallas Geological Society
... by Hooke (1967). Textural studies, that is, investigations of grain size parameters (such as mean, sorting, skewness and kurtosis) and other grain...
1977
Fluvial Sedimentology: An Historical Review
Andrew D. Miall
CSPG Special Publications
... by Hooke (1967). Textural studies, that is, investigations of grain size parameters (such as mean, sorting, skewness and kurtosis) and other grain...
1977
Dynamics of Sediment Movement
Gerard Middleton, John B. Southard
Special Publications of SEPM
... calculated from such a series (for example, root mean square and skewness of the velocity component) do not provide enough information to explain...
1984
Late Quaternary Niger Delta, and Adjacent Areas: Sedimentary Environments and Lithofacies
J. R. L. Allen
AAPG Bulletin
... in glauconite and foraminifera, the Older Sands vary widely in mean size and sorting. Poor sorting and strong skewness toward the coarser grades are induced...
1965
Upper Cretaceous Sequence Stratigraphy of the Rock Springs Uplift, Wyoming
Kurt W. Rudolph, William J. Devlin, Jeff P. Crabaugh
Rocky Mountain Association of Geologists
..., Fig. 4). Recognizing the apparent skewness of higher-order sequences provides supporting information for the interpretation of an underlying lower...
2015
Upper Cenozoic, Quartzite-Bearing Gravels of the San Bernardino Mountains, Southern California: Recycling and Mixing as a Result of Transpressional Uplift
Peter M. Sadler, Wessly A. Reeder
Pacific Section SEPM
... o n s and m o r e extreme p o s i t i v e skewness in their r o u n d n e s s frequency d i s t r i b u t i o n s . It w a s also c l e a r , h o w e...
1983
References
K. O. Emery, Elazar Uchupi
AAPG Special Volumes
.... Burckle, and B. C. Heezen, 1967, Opal phytoliths in a North Atlantic dust fall: Science, v. 155, p. 1243-1244. Folk, R. L., 1962, Of skewness and sands...
1972
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