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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Several geologic inferences are made from studies of the geographic distributions of sediment-texture variables. Evaluation of such distributions requires that information on the total within-station variability be available.
To obtain information on the relative magnitudes of the within-station and among-station variabilities, an extensive sampling program was undertaken on the continental shelf of Washington. Sampling was done in a stratified-multistage scheme on traverses placed by a systematic random system along the coast; 450 stations were occupied. Duplicate samples were taken at each station and duplicate analyses were made on each sample. Compete analyses are available for 130 stations. This sampling design leads directly to a three-level, hierarchical analysis of variance. In this analysis, the F-ratios of the mean square among stations to that within stations are measures of the reliability of distributions. Nine textural variables were measured in each of the analyses. Values of the ratios diff red greatly among the variables. Table I indicates the F-ratios for the nine variables analyzed. Each ratio is based on 129 and 130 degrees of freedom.
Table I. F-Ratios for Nine Values Analyzed
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