Hypothetical views of the Delaware basin and surrounding platform areas
during sea-level low- and
highstands. Lowstand intervals were periods of terrigenous sand transport across shelves, mainly by
eolian processes, and sand deposition occurred mainly in the basin. Highstand intervals saw develop-
ment of shelf-margin reefs with associated back reef carbonate-evaporite-redbed deposits and thick
carbonate fore-reef talus deposits. Basins of this time had only thin calcareous shale deposition.
© Peter A. Scholle, 1999