Distinction Between Tills and Other Diamictons Based on Textural Characteristics

Paulo M. B. Landim, Lawrence A. Frakes

Journal of Sedimentary Research (SEPM)

... outwash deposits. Discriminant functions utilizing mean, standard deviation, skewness, and kurtosis also separate the three types of sediment. As a test...

Depositional Environment of the St. Peter Sandstone Deduced by Textural Analysis

E. J. Amaral, W. A. Pryor

Journal of Sedimentary Research (SEPM)

...-developed bimodality. Significant regional and stratigraphic variations were observed in mean and maximum grain size, sorting, and skewness, consistent...

Grain-Size Statistics II: Evaluation of Grouped Moment Measures

Davis Swan , John J. Clague, John L. Luternauer

Journal of Sedimentary Research (SEPM)

... deviation (), skewness (Sk), and kurtosis (K) are calculated as (Agterberg, 1974, p. 164-168): = 2} Sk = [3]/[3]} (2) K = [4]/[4]} In practice...

Grain-Size Statistics I: Evaluation of the Folk and Ward Graphic Measures

Davis Swan, John J. Clague, John L. Luternauer

Journal of Sedimentary Research (SEPM)

...% of the distribution. The respective skewness and kurtosis values are only weakly related, indicating that the graphic measures respond erratically to significant...

Significance of Statistical Parameters for Distinguishing Sedimentary Environments in New South Wales, Australia

John R. Hails

Journal of Sedimentary Research (SEPM)

..., Australia, shows that if sediments are polygenetic in origin, skewness is the only parameter that can distinguish beach, barrier and dune sands...

Application of Logarithmic Moments to Size Frequency Distributions of Sediments

W. C. Krumbein

Journal of Sedimentary Research (SEPM)

..., and simple division in -terms. Thus, such measures as Trask's sorting coefficient and skewness (Trask, P. D., Origin and environment of source...

Results of a Census of Utah Geologists

J. M. Hummel, Richard Chojnacki

Utah Geological Association

... curve in the twenty-five to fifty age group, but overall a marked skewness toward youth is indicated. The experience distribution curve (fig. 2) also...

The Method of Moments: DISCUSSION

Chester K. Wentworth

Journal of Sedimentary Research (SEPM)

... for skewness, the two methods are identical and involve the same computations. Wentworth took the point of view that for the use of geologists the method...

The Interpretation of Grain Size Distribution Curves of Clastic Sediments

Derek W. Spencer

Journal of Sedimentary Research (SEPM)

... the logarithm of the grain size when computing the statistics of a grain size distribution. While the use of a logarithmic scale removes the skewness from...

Hierarchical Analysis of Variance of Shelf Sediment Texture: NOTES

James C. Kelley, Dean A. McManus

Journal of Sedimentary Research (SEPM)

...) skewness, and (i) kurtosis. No gravel was sampled. All textural analyses were made by wet seiving the sand fraction and sizing the silt and clay...

Evaluation of a Conceptual Model for the Transverse Sediment Transport System of a Coastal Barrier Chain, Middle Atlantic Bight

Gerald L. Shideler

Journal of Sedimentary Research (SEPM)

... permitted derivation of the four moment measures (mean, standard deviation, skewness, kurtosis). The moment measures served as the basis...

Recognition of Fluvial Environments in the Biyadh-Wasia Sandstones (Lower-Middle Cretaceous) as Revealed by Textural Analysis

Mohamed A. Moshrif

Journal of Sedimentary Research (SEPM)

...), standard deviation (I), skewness (SKI), and kurtosis (KG) have been calculated from the cumulative curves, using the formulae devised by Folk and Ward...

Grain-Size Characteristics of Sediment Transported During Dust Storms

W. G. Nickling

Journal of Sedimentary Research (SEPM)

... positive skewness, which results from the selective removal of surface particles small enough to be transported by the wind at a given velocity...

Depositional Environments and Sedimentary Processes in Chile Trench: ABSTRACT

Todd M. Thornburg, L. D. Kulm

AAPG Bulletin

..., mean size, sorting, skewness); individual sheet flows can be identified and studied spatially. Skewness is consistently positive; the mode is perhaps...

Abstract: Mudstone Aggregates and their Implications for Sedimentology and Reservoir Characteristics, by Laycock, Dallin P.; Pedersen, Per; Spencer, Ronald; #90163 (2013)

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Sedimentation-erosion Cycles of Single Tidal Periods on Long Island Sound Beaches

Ervin G. Otvos, Jr.

Journal of Sedimentary Research (SEPM)

... negative skewness (SKG=-0.68-+0.26) than the fine ones. The depth of the disturbance of the foreshore surface sediments by tidal erosion was found...

The Use of Grain Size Statistics to Distinguish Between High- and Moderate-energy Beach Environments

Karl F. Nordstrom

Journal of Sedimentary Research (SEPM)

... gram. Grain size statistics for the mean (Mz), standard deviation (I), skewness (SKI), and kurtosis (KG), were obtained using Folk s graphic method (Folk...

Empirical Conversion Equations for Thin-Section and Sieve Derived Size Distribution Parameters

J. A. Harrell, K. A. Eriksson

Journal of Sedimentary Research (SEPM)

... standard deviation, inclusive graphic skewness, graphic skewness, and graphic kurtosis. The correlation coefficients for each of these are respectively...

Mechanical Analysis of Some Bottom Deposits of the Northern Red Sea

N. M. Shukri, R. A. Higazy

Journal of Sedimentary Research (SEPM)

..., and the coefficient of skewness Sk and its logarithm log Sk (8, pp. 229 ff.) were calculated from the cumulative curves. The weight percentages...

Continental Shelf Sediments of Long Island, New York

Thomas F. Mckinney , Gerald M. Friedman

Journal of Sedimentary Research (SEPM)

...; skewness, in general, is slightly positive. Standard deviation values for the middle shelf sands class them as moderately sorted; both negative...

ABSTRACT: Age and formation of oceanic basement beneath the Colombian and Venezuelan Basins: magnetic anomaly evidence

Hall, S.A, Ghosh, N., Casey, J.F. and Burke, K. C.

Geological Society of Trinidad & Tobago

... of the triple junction has been determined from the skewness of magnetic anomalies as 20-30 0 either N or S depending on the identification of the seafloor...

Abstract: Seasonal Analysis of Beach Sedimentation on the South Texas Coast

Richard A. Davis, Jr.

GCAGS Transactions

... temporal variation. Skewness shows a wide temporal variation throughout the entire study area. Beach morphololgy also varies throughout the area...

Grain-Size Characteristics of Linear Dunes in the Southwestern Kalahari: DISCUSSION

David S. G. Thomas, H. Elizabeth Martin

Journal of Sedimentary Research (SEPM)

... of statistical parameters. Lancaster identifies trends in the relationships between mean grain size and both sorting and skewness and between sorting...

Some Aspects of Lower Godavari River and Delta Sediments, India: ABSTRACT

A. S. Naidu, C. Borreswara Rao

AAPG Bulletin

... of sorting increases progressively along the river course; skewness changes from positive to negative while kurtosis remains constant. These changes...

Quantitative Approach to Nature and Areal Variability of Fold Geometry: ABSTRACT

E. H. T. Whitten

AAPG Bulletin

... scalars include direction cosines of the principal axes, kurtosis and skewness of the cos ^Thgr values, and the ratio of profile length to wave length...