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. 1. Isopach map of the Morrow Sandstone showing location of the Arroyo and Gentzler fields in southwest Kansas. Contour interval = 250 feet (76.2 m).