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Cross-association is a standard correlation technique. It is valid for theoretically complete stratigraphie sequences, but not for stratigraphie sequences as they commonly occur. A major problem is its inability to include correlations across gaps caused by local nondeposition or eroded strata. The methods proposed in this paper do include correlations across gaps and allow for completely general measurements of strata similarity. In addition, they are extended to include correlation of a fragmentary sequence with a longer complete sequence and to include correlations of more than two sequences. Using these techniques, most problems can be handled by hand calculation.
Smith et al. (Tue,) studied this question.