Diagrammatic representation of modern groundwater flow patterns
in the Delaware Basin area. Red band represents the Capitan shelf
margin facies. Black arrows show fluid flow directions prior to
incision of the Pecos River and before modern-day groundwater
withdrawal and oil development. Thickness of arrows is
proportional to volume of water flow. Contours show
concentration of total dissolved solids (in ppt or thousands
of parts per million) in waters moving across the basin in
the Capitan-equivalent upper Bell Canyon Formation.
From Scholle et al. (1992); adapted from McNeal (1965)
and Hiss (1980).