Click on image for enlargement (second click may be required).

Figure 2. Generalized regional dip section of the Bossier facies. Sand deposition represents cycles of sand progradation into the basin onto organic-rich mud, succeeded by marine transgression. Much of the Bossier shales downdip appear to be time equivalent to the updip Cotton Valley Sandstone and represent prodelta/delta-front material related to Cotton Valley deltaic systems (drawing courtesy of Anadarko Petroleum Corporation, 1999).