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The AAPG/Datapages Combined Publications Database

Showing 800 Results. Searched 195,502 documents.

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Particle-size Distribution in Nearshore Environments

D. L. Inman , T. K. Chamberlain

Journal of Sedimentary Research (SEPM)

..., median diameter, standard deviation measure, and skewness measure. The findings and techniques from the detailed studied area have been used with success...

1953

Dune Sediments: Characteristics, Recognition, and Importance: ABSTRACT

Joao Jose Bigarella

AAPG Bulletin

... dune sand is slightly better sorted than other sediments, sorting is not distinctive. Positive skewness has been considered as an indication of dune...

1969

Sand Leakage around Rocky Headland at Niteroi, Brazil: ABSTRACT

M. D. Emmerling, W. F. Tanner

AAPG Bulletin

... toward the headland (0.370 ± 0.020 to 0.450 ± 0.020); (4) skewness increases from a negative minimum (-0.150 ± 0.020) away from the headland...

1974

A Textural Study of Marine Sediments in a Portion of Cardigan Bay (Wales)

Anthony S. G. Jones

Journal of Sedimentary Research (SEPM)

... that the sign of the skewness is sensitive to the environment. There appears to be a general interrelationship between the form of the bathymetry...

1971

Hydrodynamic Implications of Beach, Beach Ridge and Dune Grain Size Studies

Frank W. Stapor , William F. Tanner

Journal of Sedimentary Research (SEPM)

... largely by swash action. Washover and slip-yface bedding are, in general, not present in beach ridges. Skewness is the most important moment measure...

1975

The Significance and Limitations of Statistical Parameters for Distinguishing Ancient and Modern Sedimentary Environments of the Lower Georgia Coastal Plain

John R. Hails, John H. Hoyt

Journal of Sedimentary Research (SEPM)

... than 90 percent of the Holocene beach sands are negatively skewed, but about 70 percent of the dune sands show positive skewness. The sign of skewness...

1969

Estimation of Recent Sediment Size Parameters from a Triangular Diagram

William J. Plumley, Donald H. Davis

Journal of Sedimentary Research (SEPM)

...-silt-clay composition. A simple analytical procedure exists whereby sediment size parameters of median, mean, deviation measure, and skewness...

1956

Skewness and Kurtosis as Criteria of Normality in Observed Frequency Distributions: NOTES

Thomas A. Jones

Journal of Sedimentary Research (SEPM)

...Skewness and Kurtosis as Criteria of Normality in Observed Frequency Distributions: NOTES Thomas A. Jones 1969 Vol. 39 No. 4. (December), Moment...

1969

Grain Size in Laminae of Beach Sand

K. O. Emery

Journal of Sedimentary Research (SEPM)

... curves. Statistical measures of median diameter, sorting, skewness, and kurtosis may be computed in several ways: the simple quartiles used by Trask...

1978

Analysis of Variance Applied to Measures of Central Tendency and Dispersion in Sediments

Wayne C. Isphording

Journal of Sedimentary Research (SEPM)

... deviation, skewness and kurtosis were calculated using (1) the central moment measure equations, (2) Folk and Ward's equations and (3) Inman's equations...

1972

A Study of Textural Changes in a Beach by Repeated Samplings

Marshall Schalk

Journal of Sedimentary Research (SEPM)

... and low tide medians tends to remain of the same order. To a much lesser degree, the skewness and sorting values tend to change in unison...

1946

Polymodal Composition of Beach Sands from the East Coast of India

A. Chakrabarti

Journal of Sedimentary Research (SEPM)

... graphic standard deviation and inclusive graphic skewness on graphic mean size, determined separately for the different size groups, viz medium sand (1.0...

1977

Dynamic Processes and Statistical Parameters Compared for Size Frequency Distribution of Beach and River Sands

Gerald M. Friedman

Journal of Sedimentary Research (SEPM)

... (<62µ) and coarse-grained (first percentile) tall fractions and various moment and graphical measures, such as Third Moment (skewness), Mean Cubed...

1967

Comparison of the Descriptors of Sediment Grain-size Distributions

Thomas A. Jones

Journal of Sedimentary Research (SEPM)

... because of interpolation of percentiles. More serious is that the graphical statistics are highly interrelated, so varying amounts of skewness...

1970

Estimation of Recent Sediment Size Parameters from a Triangular Diagram

William J. Plumley and Donald H. Davis

Journal of Sedimentary Research (SEPM)

... and sand-silt-clay composition. A simple analytical procedure exists whereby sediment-size parameters of median, mean, deviation measure, and skewness...

1955

Skewness as a Paleoenvironmental Indicator: DISCUSSION

R. R. Jordan, R. N. Benson, N. Spoljaric, T. E. Pickett

Journal of Sedimentary Research (SEPM)

...Skewness as a Paleoenvironmental Indicator: DISCUSSION R. R. Jordan, R. N. Benson, N. Spoljaric, T. E. Pickett 1978 Vol. 48 No. 3. (September...

1978

Textural Analysis with Texas Instruments 59 Programmable Calculator: RESEARCH-METHOD PAPER

D. Joe Benson

Journal of Sedimentary Research (SEPM)

... mean, standard deviation, skewness, and kurtosis. The program is written for use with Texas Instruments, T.I. 59 programmable calculator...

1981

Environmental Analysis of Ancient Sandstone Bodies by Discriminant Analysis: ABSTRACT

R. J. Moiola, Daniel Weiser

AAPG Bulletin

... sedimentologists have demonstrated that certain combinations of textural parameters (e.g., mean diameter vs. skewness; mean diameter vs. standard...

1969

Computerized Particle Size Analyzer--An Exploration Technique, Saint Mary Field, Lafayette County, Arkansas: ABSTRACT

Thomas L. Ham, Raymond P. Bruce

AAPG Bulletin

... 1984 1212 1212 68 9. (September) Grain size frequency and cumulative weight percentages, mean grain size, standard deviation, and skewness provide...

1984

Grain-Size Components As Markers of Origin and Depositional Processes In the Coastal Zone of the Golfe Du Lion (Mediterranean Sea, France)

J. Paul Barusseau, Raphaël Braud

Journal of Sedimentary Research (SEPM)

... by grain-size modal analysis and confirmed by a deconvolution program (LogNormal Deconvolution of Grain Size). Grain-size skewness is related to a much...

2014

Abstracts of Theses: Shallow-Water Ripple Marks at Pinery Park, Lake Huron, Ontario

Risk, M. J.

CSPG Bulletin

... away from shore, but increases with increasing ripple-mark wavelength. Skewness of samples increases away from shore, but decreases with an increase...

1968

Bimodal Composition and Cyclic Characteristics of Beach Sediment in Continuously Changing Profiles

Choule J. Sonu

Journal of Sedimentary Research (SEPM)

..., skewness, and kurtosis. (For necessary mathematics, see Inman, 1952). The composition of the beach material along the Outer Banks of North Carolina...

1972

Grain-Size and Moment Measures: A New Look at Karl Pearson's Ideas on Distributions

Samuel D. Leroy

Journal of Sedimentary Research (SEPM)

... not proven to have an unambiguous significance in sedimentary analysis. The reason for this becomes apparent when one graphs normalized skewness...

1981

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