A detailed analysis of depression spatial distribution on the parts of the Western Highland Rim and Pennyroyal Plain underlain by the St. Louis and Ste. Genevieve Limestones indicates the presence of a depression infrastructure. The major geomorphic elements of the infrastructure include depression density (no./km2), doline swallet order, and interdoline spacing. A multigenerational diffusion and competition process model best explained: (1) the presence of two lognormally distibuted depression density subpopulations; (2) discrete, clustered depression sets containing second-order swallet dolines surrounded by first-order swallet depressions; (3) geomorphic competition between adjacent second-order swallet dolines for runoff and catchment area; and (4) a positive correlation between interdoline rim spacings of the small swallet order and the sum of their respective major axial lengths.

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