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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,688 documents.
Nearshore Morphology and Sediment Characteristics Along Ward Island, Corpus Christi, Texas
Deidre D. Williams , Nicholas C. Kraus
GCAGS Transactions
...). The statistical parameters of median grain size diameter, inclusive graphic standard deviation, skewness, and kurtosis were then derived from these two...
1998
Origin of Friable Sandstone-Calcareous Sandstone Rhythms in the Upper Lias of England
David K. Davies
Journal of Sedimentary Research (SEPM)
...), the maximum variation between both sandstone types of median grain size, sorting, and skewness coefficients was 0.10 phi, 0.03 phi and 0.04 phi respectively...
1967
Seagrass Sediment Particle-Size and Content in Estero Bay Preserve, Southwestern Florida
Hugh J. Mitchell-Tapping, Joseph C. Mallon
GCAGS Transactions
... the gravel and mud components. Average skewness (symmetry of distribution) is positive, indicating an excess of fine particles, while average...
2000
Composition of Sand Released from Three Source Areas Under Humid, Low Relief Weathering in the North Carolina Piedmont
William R. Mann , Victor V. Cavaroc
Journal of Sedimentary Research (SEPM)
... positive skewness and excessive peakedness. Grains of pebble and cobble size were essentially absent at these sample sites. Sample size distributions from...
1973
Note on Weathered Arkosic Beds
M. R. Mousinho De Meis, Elmo S. Amador
Journal of Sedimentary Research (SEPM)
... to give very randomly distributed values of skewness and the colluvium may be positively to negatively skewed. The stratified clayey sandstones...
1974
Downstream Changes in Shape in the Pebble Morphometry of the Tambo River, Eastern Victoria
Albert Goede
Journal of Sedimentary Research (SEPM)
..., standard deviation, skewness, kurtosis and frequency distribution were calculated. Finally the programme also computed correlation coefficients...
1975
Differentiation of Glacier Environments by Sediment Characteristics: Athabasca Glacier, Alberta, Canada
Hugh H. Mills
Journal of Sedimentary Research (SEPM)
...-moraine till, ablation till, and outwash. Mean particle size and sorting increase in the above order, and skewness also varies with environment. Clast...
1977
Recognition and Sedimentologic Description of Recent Debris Flow Deposits from the Ross and Weddell Seas, Antarctica
Dennis D. Kurtz, John B. Anderson
Journal of Sedimentary Research (SEPM)
... grain size and standard deviation, and graphic measures of skewness (SkI) and kurtosis (KG) (Folk and Ward, 1957) were produced from the combined data...
1979
Sedimentary Reflections of Depositional Environment in San Miguel Lagoon, Baja California, Mexico
Harris B. Stewart, Jr.
AAPG Bulletin
... deviation measure and the phi skewness for these sediments, these parameters are plotted as the x, y, and z co-ordinates of a Cartesian coordinate...
1958
Basalt Breccias and Conglomerates in the Lower Jurassic McCoy Brook Formation, Fundy Basin, Nova Scotia: Differentiation of Talus and Debris-Flow Deposits
Lawrence H. Tanner , John F. Hubert
Journal of Sedimentary Research (SEPM)
... to 5.7 phi (Fig. 5). The grain-size distributions are strongly bimodal and strongly fine-skewed. Graphic skewness varies from 0.5 to 0.7. Mean grain...
1991
A paleoecologic comparison of two edrioasteroid (echinodermata) encrusted pavements from the Upper Ordovician Corryville Formation of Florence, Kentucky and the Miamitown Shale of Sharonville, Ohio U.S.A.
René A. Shroat-Lewis, Colin D. Sumrall, Michael L. Mckinney, David L. Meyer
PALAIOS
..., maximum of 34.05 mm, and skewness of 1.92. 160 PALAIOS R.A. SHROAT-LEWIS ET AL. FIG. 6.—Specimens of Isorophus cincinnatiensis found...
2014
Onshore-offshore trends in the temporal resolution of molluscan death assemblages: how age-frequency distributions reveal Quaternary sea-level history
Matias do Nascimento Ritter, Fernando Erthal, Matthew A. Kosnik, Michal Kowalewski, João Carlos Coimbra, Felipe Caron, Darrell S. Kaufman
PALAIOS
...). The onshore-offshore changes in the observed properties of AFDs—increased median age and decreased skewness, but only slightly increased temporal mixing...
2023
Shale Gas Production Decline Trend Comparison Over Time and Basins Revisited
Jason Baihly, Raj Malpani, Raphael M. Altman, Garrett Lindsay, Richard Clayton
Unconventional Resources Technology Conference (URTEC)
... of this distribution type as their skewness was near zero. The Barnett is a taller log-normal distribution with slight positive skewness, whereas...
2015
Biogeochemistry of Sediments in Experimental Mohole
S. C. Rittenberg, K. O. Emery, Jobst Hulsemann, E. T. Degens, R. C. Fay, J. H. Reuter, J. R. Grady, S. H. Richardson, E. E. Bray
Journal of Sedimentary Research (SEPM)
... as grainsize frequency curves, are skewed to the finer sizes. The same shape of curve can be expressed by the Trask skewness measure (Sk=[Q25-Q75]/[M2...
1963
Sediments of the Malacca Strait, Southeast Asia
George H. Keller , Adrian F. Richards
Journal of Sedimentary Research (SEPM)
... distribution such as central tendency, dispersion and skewness follow the procedure recommended by Inman (1952). Median diameters and quartiles were...
1967
Gondwana Sedimentation Around Bheemaram (Bhimaram), Pranhita-Godavari Valley, India
Supriya Sengupta
Journal of Sedimentary Research (SEPM)
... to fine grained Lower Kamthi, Yerrapalli and Maleri rocks, all other samples analyzed are coarse grained and poorly sorted. Skewness and kurtosis values...
1970
Shelf-Edge, Calcareous Prominences in Northeastern Gulf of Mexico
John C. Ludwick , William R. Walton
AAPG Bulletin
... skewness denoting an excess of material, above Gaussian amounts, of a fine-grained admixture to the chief grain-size ingredient. The average quartile...
1957
Petrology of Pennsylvanian Rocks, Bighorn Basin, Wyoming
Thomas W. Todd
AAPG Bulletin
... parameters (mean, standard deviation, skewness, and normalized kurtosis) were computed from formulae given in Folk and Ward (1957). Results are presented...
1964
Sediments and Sedimentary Processes of Eastern Mississippi Cone, Gulf of Mexico
Ter-Chien Huang , H. G. Goodell
AAPG Bulletin
.... Standard deviation; skewness; percent sand, silt, coarse clay, and fine clay; 7A kaolinite/10A illite X-ray peak area; 14A montmorillonite/7A kaolinite X...
1970
Paleoecologic assessment of an edrioasteroid (Echinodermata) encrusted hardground from the Upper Ordovician (Maysvillian) Bellevue Member, Maysville, Kentucky
René A. Shroat-Lewis, Michael L. McKinney, Carlton E. Brett, David L. Meyer, Colin D. Sumrall
PALAIOS
... mm, maximum of 28.75 mm, and skewness of 21.16. The Maysville hardground contains 121 specimens of Curvitriordo stecki, of which 115 could be measured...
2011
The Kujung Formation in Kurnia-1: A Viable Fractured Reservoir Play in the South Madura Block
Trevor Magee, Craig Buchan, Jeremy Prosser
Indonesian Petroleum Association
... Count Min Spacing (m) Max Spacing (m) Geometric Mean (m) Median (m) Mode (m) St Dev Error Wε Acute angle Kurtosis Skewness Cluster width Matrix block...
2010
Paleoecologic analysis of edrioasteroid (Echinodermata) encrusted slabs from the Chesterian (Upper Mississippian) Kinkaid Limestone of southern Illinois
René A. Shroat-Lewis, Emily N. Greenwood, Colin D. Sumrall
PALAIOS
... mm), mode of 2.50 mm, median of 2.75 mm, minimum of 0.42 mm, maximum of 10.17 mm, and skewness of 1.46. The data show a right-skewed bimodal...
2019
A Methodology For Disaggregation and Textural Analysis of Quartz-cemented Sandstones
Sarah A. Maithel, Leonard R. Brand, John H. Whitmore
Journal of Sedimentary Research (SEPM)
... many of our laser-diffraction-analysis histograms appear distinctly fine skewed, we observe similar skewness trends in our thin-section data (Fig. 2...
2019
Grain-Size Distribution and Depositional Environment of Whitemud Sandstones, Edmonton Formation (Upper Cretaceous) Alberta, Canada1
P. L. Binda, J. F. Lerbekmo
CSPG Bulletin
... sands of beach, coastal-dune, and eolian-flat environments from Mustang Island by means of plots of skewness versus kurtosis. Friedman (1961, 1967...
1973
Unkpapa Sandstone (Jurassic), Black Hills, South Dakota: An Eolian Facies of the Morrison Formation
George J. Szigeti, James E. Fox
Special Publications of SEPM
... Dinosaur D Burrow or Dikaka B B Mean grain size and standard deviation of selected samples C Oraphic skewness solid circle and kurtosis open circle...
1981