Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 243, part 1
Sedimentology and Ichnology of Paleozoic Estuarine and Shoreface Reservoirs, Morrow Sandstone, Lower Pennsylvanian of Southwest Kansas, USA

Fig. 60. Forced-regression surface separating proximal middle-shoreface deposits (facies J) from the underlying offshore deposits (facies N) (Nell).