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

Table 1. Facies scheme of the lower Morrow Sandstone in the Arroyo and Gentzler fields.

Facies	Depositional Process	Sedimentary Environment
A: Fine-grained sandstones	Tractive currents	Fluvial channels
B: Rooted siltstones	Pedogenic processes	Paleosol
C: Very coarse grained to fine-grained sandstones with clay drapes	Migration of subaqueous, unidirectional flow dunes and slack-water sediment fallout	Upper-estuarine, bay-head delta channels
D: Parallel-laminated black shales with fading ripples	Sediment fallout and low-energy tidal currents	Central-estuarine bay
E: Flaser- and wavy-bedded sandstones and siltstones	Tidal currents	Restricted tidal flat
F: Inclined, deformed sandstones and siltstones	Tidal currents, sediment downslope movement and lateral accretion	Tidal channel
G: Laminated calcareous mudstones	Sediment fallout	Lower estuary
H: Poorly to moderately fossiliferous, planar-crossbedded sandstones	Migration of subaqueous, unidirectional flow dunes	Estuarine mouth
I: Highly fossiliferous, planar-crossbedded, very coarse grained to medium-grained sandstones and pebble conglomerates	Migration of subaqueous, unidirectional flow dunes	Upper shoreface
J: Rarely to moderately burrowed, planar-crossbedded, medium- to fine-grained sandstones	Migration of subaqueous, unidirectional flow dunes	Proximal middle shoreface
K: Moderately to thoroughly burrowed, rippled, fine-grained sandstones	Migration of subaqueous, unidirectional flow ripples and sediment fallout	Distal middle shoreface
L: Thoroughly burrowed, fine-grained to very fine grained silty sandstones with starved ripples	Migration of subaqueous, unidirectional flow ripples and sediment fallout	Lower shoreface
M: Thoroughly burrowed, very fine grained silty sandstones and siltstones with interbedded, normally graded sandstones	Storm action and sediment fallout	Offshore transition
N: Thoroughly burrowed siltstones	Sediment fallout	Offshore
Parallel laminated black shales	Sediment fallout	Shelf