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. 58. Forced regression surface separating upper-shoreface deposits (facies I) from the underlying lower-shoreface (facies L) to offshore-transition deposits (facies M) (Gaskill).