In facies map practice percentage maps and ratio maps are sometimes considered as strongly alternative ways of expressing certain facies patterns. The fixed relation between percentages and ratios for a common set of data implies that the maps are supplementary instead of competitive. It is shown in this paper that the conventional arc sine transformation of percentage data yields numbers identical with an arc tan transformation of the corresponding ratios, and that a single facies map of the transformed variables simultaneously presents some of the implications of both types of individual map. The transformation also facilitates further statistical analysis of the map data, especially in connection with analysis of variance.

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