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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 42 (1972)No. 2. (June), Pages 476-481

A Multiple Grouping Method for the Choice of Isopleth Values of Mineral Distribution Maps: NOTES

S. Bevan Devine (2), Prentiss E. Schilling, Ray E. Ferrell, Jr.

ABSTRACT

The grouping of means of mineral percentage determinations into subsets by Duncan's new multiple range test (Duncan, 1955), has been used to obtain isopleth intervals for regional distribution maps. Isopleth values determined by this test have the advantage that a degree of confidence can be provided for defining significantly different areas. By comparison, arbitrarily chosen contour intervals may not define areas that are different. This is especially true when the data are imprecise.


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