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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,689 documents.
Solving the puzzle of the bivalve shell fragment: inferring the original abundance and size frequency from the fragmented record
Eric N. Powell
PALAIOS
... dynamics leading to size-frequency skewness and modality (e.g., Olson 1957; Hallam 1967; Shimoyama 1985; Cummins et al. 1986; Tomaˇov´ ch 2004b...
2020
Selective sediment transport during Hurricane Sandy on Fire Island (New York, USA): Inferences from heavy-mineral assemblages
João Cascalho, Pedro J.M. Costa, Guy Gelfenbaum, Seanpaul La Selle, Bruce Jaffe
Journal of Sedimentary Research (SEPM)
..., skewness, and kurtosis) of the collected sediments were calculated according to the method of moments using GradiStat software, version 8.0 (Blott and Pye...
2020
Shape difference of mud clasts depending on depositional facies: application of newly modified elliptic Fourier analysis to hybrid event beds
Sojiro Fukuda, Hajime Naruse
Journal of Sedimentary Research (SEPM)
...). In total, clasts range from –1.5 psi to 7.8 psi in area diameter. Their patterns of distribution show large negative skewness. Size of clasts tends to show...
2020
Depositional Environments, Foremost Formation (Late Cretaceous), Milk River Area, Southern Alberta.
O. Ogunyomi, L. V. Hills
CSPG Bulletin
... paper. Statistical parameters of mean, standard deviation and skewness were calculated by using the formulae of Folk and Ward (1957). Because...
1977
Using delta channel width to estimate paleodischarge in the rock record: geometric scaling and practical sampling criteria
Octria Adi Prasojo, Anna E. van Yperen, Trevor B. Hoey, Amanda Owen, Richard Williams
Journal of Sedimentary Research (SEPM)
... dominant. The positive skewness in dimensionless channel widths in all delta types and locations (Fig. 4) has also been reported from fluvial outcrops...
2024
Recognition of Transgressive and Post-Transgressive Sand Ridges On The New Jersey Continental Shelf
W. L. Stubblefieldi, D. W. McGrail, D. G. Kersey
Special Publications of SEPM
... ridge cores indicate that these ridges are finer grained better sorted tend toward more negative skewness and may have a higher kurtosis Bathymetry...
1984
THE MT. ANTERO GRANITE, SAWATCH RANGE, COLORADO
Tommy B. Thompson, Robert J. Pulfrey
Rocky Mountain Association of Geologists
... t p o s i t i v e skewness. W i t h t h e e x c e p t i o n o f molybdenum, the o t h e r t r a c e metal c o n t e n t s a r e c o n s i d e r a b l...
1973
EOLIAN-FLUVIATILE (CONTINENTAL) ORIGIN OF ANCIENT STRATIGRAPHIC TRAP FOR PETROLEUM IN WEBER SANDSTONE, RANGELY OIL FIELD, COLORADO
Steven G. Fryberger
Rocky Mountain Association of Geologists
... s i z e 3.2 0 (very f i n e sand), s o r t i n g 0.84 0 (moderate), and skewness +1.08 ( s t r o n g l y f i n e skewed, Folk, 1974). Grains a r e u...
1979
Mineralogy and Petrology of the Rocks Near the Quadrant-phosphoria Boundary in Southwest Montana
Charles E. Weaver
Journal of Sedimentary Research (SEPM)
... to 0.196 mm. The Mo values in all samples are slightly larger than or equal to the corresponding Md values. The skewness values (Sk, table 3) are all...
1955
Petrography of Northeastern Lake Michigan Bottom Sediments
John Ezra Moore
Journal of Sedimentary Research (SEPM)
... 410------------------------ The median, quartile values, sorting factor, and skewness were determined from these curves (table 4). Percentages...
1961
Patterns of Organic-Carbon Enrichment in a Lacustrine Source Rock in Relation to Paleo-Lake Level, Congo Basin, West Africa
Nicholas B. Harris, Katherine H. Freeman, Richard D. Pancost, Gareth D. Mitchell, Timothy S. White, Ray H. Bate
Special Publications of SEPM
... skewness in the distribution. SOURCES OF ORGANIC MATTER The origin of organic matter in the Marnes Noires Formation was evaluated through organic...
2005
Hydrothermal Mineralization in the Guaymas Basin, Gulf of California: Chapter 34: Part VI. Hydrothermal Processes
Jan M. Peter, Steven D. Scott
AAPG Special Volumes
... to 277°C (Peter and Scott, 1988). The temperature distributions of both primary and secondary fluid inclusions show a pronounced negative skewness...
1991
Petrography Of Red Peak Member, Chugwater Formation (triassic), West-Central Wyoming
M. Dane Picard
Journal of Sedimentary Research (SEPM)
... are distinguished by similarities in their mean and median grain size, sorting and skewness (table 1; fig. 3). Samples 2, 3 and 4 form one group, samples 1, 5...
1966
Wyoming Geological Association Field Trip One: Frewens Sandstone September 6th & 7th
Dr. Brian J. Willis, Janok P. Bhattacharya, Christopher D. White, Shirley P. Dutton, Sharon L. Gabel
Wyoming Geological Association
... deviation, sk is skewness, and cv is the coefficient of variation (from Willis and White, 2000). Figure 28. Vertical property trends for the Frewens...
2003
Chapter Four: Thin-Bedded Turbidites: Overview and Petroleum Perspective
Dorrik A. V. Stow, Bayonle A. Omoniyi
AAPG Special Volumes
... grain size of the interbedded mud divisions; other textural attributes (e.g., sorting and skewness) can also be quantified. Sediment composition...
2018
Sedimentology, Statistics, and Flow Behavior for a Tide-influenced Deltaic Sandstone, Frontier Formation, Wyoming, United States
Christopher D. White, Brian J. Willis, Shirley P. Dutton, Janok P. Bhattacharya, Keshav Narayanan
AAPG Special Volumes
... is the geometric mean, m is the arithmetic mean, sd is the standard deviation, sk is skewness, and cv is the coefficient of variation (Willis et al., 1999...
2004
Lateral Correlation and Interpolation of Logs: Chapter 6
John H. Doveton
AAPG Special Volumes
...). Higher order moments pick up progressively finer nuances of profile shape with depth. The third moment is a measure of skewness or asymmetry. The fourth...
1994
Distribution and Ecology of Foraminifera from East Mississippi Delta Margin
Robert R. Lankford
AAPG Bulletin
...) in the area; the relation of these types to median diameter, phi deviation, and phi skewness is given in Figure 5-b. Hydrogen ion concentration...
1959
Fluvial Facies Models and Their Application
Douglas J. Cant
AAPG Special Volumes
... to interpret depositional environment. For modern sediments, graphs of skewness versus sorting discriminate between environments in many cases, but appear...
1982
Holocene Carbonate Sedimentation on Northern Belize Shelf: PART 1
Walter C. Pusey III
AAPG Special Volumes
... parameters of sorting, skewness, and kurtosis do not have the same environmental meaning for carbonate sediments as they do for terrigenous noncarbonate...
1975
Factors Controlling Sediment Preservation on a North Jamaican Fringing Reef: A Process-Based Approach to Microfacies Analysis
Christopher T. Perry
Journal of Sedimentary Research (SEPM)
...). Another fraction was used for determination of sediment grain size, with mean grain size, sorting, and skewness being graphically determined from...
2000
Use of Vertical Profile in Environmental Reconstruction
G. S. Visher
AAPG Bulletin
..., and possibly skewness may be used to subdivide what appear to be homogeneous sequences of sediments into units which differ in depositional process...
1965
North Palawan Block, Philippines--Its Relation to Asian Mainland and Role in Evolution of South China Sea
N. H. Holloway
AAPG Bulletin
... skewness of the two western sectors of the spreading axis are also interpreted to have been controlled by the prior crustal attenuation. To the east...
1982
Evolution of Salt Structures, East Texas Diapir Province, Part 2: Patterns and Rates of Halokinesis
S. J. Seni, M. P. A. Jackson
AAPG Bulletin
... compared with older strata reflects less variable sediment accumulation rates. Salt-induced skewness is clearly evident by decreasing slopes above...
1983
Use of outcrop observations, geostatistical analysis, and flow simulation to investigate structural controls on secondary hydrocarbon migration in the Anacacho Limestone, Uvalde, Texas
Christopher E. Wilson, Atilla Aydin, Louis J. Durlofsky, Alexandre Boucher, Darrell T. Brownlow
AAPG Bulletin
... of the packstone and grainstone (Table 1). The mean, medians, and skewness of the wackestone facies data are markedly different from those...
2011