--> Edwards stratigraphy—two units, based on lithology, petrography, and paleontology and illustrated by core samples and well log, which shows the Regional Dense Marker Bed separating the two units.

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Edwards stratigraphy—two units, based on lithology, petrography, and paleontology and illustrated by core samples and well log, which shows the Regional Dense Marker Bed separating the two units. See Waite et al. (2007).