In southernmost Kansas, the regressive Stoner Limestone Member grades into a siliciclastic sequence, most of which is assigned to the Rock Lake Shale Member. Detailed study of surface and subsurface data from these siliciclastics show that deltaic systems prograded into the cratonic sea from Ouachita sources. Analyses of texture and sedimentary structures in lithic samples and of geophysical well-log characteristics indicate that early during Stanton regressive deposition, a fluvially dominated deltaic lobe complex prograded northwestward across the Oklahoma-Kansas border and initiated Stanton siliciclastic deposition in the detrital-facies belt in southeastern Kansas. This lobe complex was eventually abandoned as the sediment sources shifted northward along the eastern margin of the sea, and a later deltaic lobe complex (represented by the Onion Creek Sandstone) prograded along the southern limit of the carbonate platform (Stoner Limestone Member) to the north. Textural and compositional characteristics of Stanton siliciclastics indicate that they were derived from preexisting sedimentary rocks. Pennsylvanian uplift of early Paleozoic sedimentary rocks occurred. Sediments derived from these rocks were transported northward and westward resulting in punctuation of the dominantly carbonate Missourian Series with siliciclastics in southeastern Kansas. Although very little petroleum has been produced from the siliciclastic portions of the Stanton Formation, similar sedimentary complexes may be more productive.--Modified journal abstract.