The cyclic pattern of deposition in the Horquilla Limestone of southeastern Arizona resulted from glacio-eustatic sea-level fluctuations with periodicities within the Milankovitch band. The depositional surface fluctuated from above sea level to below the depth of autochthonous carbonate production. By means of characteristics of the cycles, correlations can be established not only between sections in the Pedregosa basin of southeastern Arizona, but also to the midcontinent of the United States. These correlations exceed the resolution of biostratigraphy and distinguish the eustatic component of relative sea-level fluctuations in widely spaced basins with different depositional settings.

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