A thick (>6,000-ft [>1,830-m]) succession of Desmoinesian to Virgilian (Pennsylvanian) strata in the northwest part of the Anadarko Basin contains a variety of tide-modified deposits. This succession, which encompasses the Marmaton Group (Upper Desmoinesian), Cleveland Formation (Missourian) and Douglas Group (Virgilian), records progradation of highstand tide-modified delta and littoral systems punctuated by lowstand incised-valley deposits.