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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 50 (1980)No. 1. (March), Pages 165-172

Effectiveness of Discriminating Beach, Dune, and River Sands by Moments and the Cumulative Weight Percentages

R. W. Tucker (2), H. L. Vacher


We have found that there is considerable overlap in environmental fields defined by linear discriminant functions we have derived from either of two sets of sediment-size data--the four moment statistics; the cumulative weight percentages. The environments we have investigated are the classic ones--beaches; dunes: river bars. The samples number 970 and are from 40 American localities. The size analysis is by settling-tube methodologies, and the size-class interval is 0.1 ^phgr.

The overlap in the fields indicates that there would be a relatively high probability of error associated with the identification of an unknown. Uncertainty levels for an identification are estimated at 25 ± 15 percent, if one of the three environments could be eliminated by other evidence, and 35 ± 15 percent, if one of them cannot be eliminated.

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