DEVONIAN SYSTEM (MOD;0)

State	Missouri
Name	DEVONIAN SYSTEM
Geologic age	Phanerozoic \| Paleozoic \| Devonian-Early Devonian-Middle(?) Devonian-Late
Original map label	D
Comments	IN SOUTHWEST MO- (Upper Series), Chattanooga Shale- (30 ft. max) black shale; Sylamore Sandstone- (14 ft. max) quartz sandstone; (Middle Series), Fortune FM- (6 ft. max) sandstone, chert, limestone. IN CENTRAL MO- (Upper Series), Holts Summit Sandstone (max thickness ?)- sandstone; Snyder Creek Shale- (max thickness 60 ft.)- calcareous and arenaceous shale with thin beds of limestone and sandstone; (Middle Series)- Cedar Valley Limestone (max thickness ?)- limestone. IN NORTHEAST MO- (Upper series), Louisiana Limestone- (max thickness 67 ft.) dense to lithographic, bluishish-gray, hard, brittle limestone which grades into yellow-brown massive silty dolomite; Saverton Shale (max thickness 14 ft.)- greenish or blueish gray, fissile, silty, and sandy shale; Grassy Creek Shale (max thickness 67 ft.)- dark olive gray to brown black, hard, fissile, carbonaceous shale; Terpin Sandstone (max thickness ?)- sandstone; (Middle Series), Cedar Valley Limestone (max thickness ?)- limestone. IN EAST-CENTRAL MO- (Upper Series), Bushberg Sandstone ( max thickness 14 ft.)- yellowish-brown, fine to coarse grained friable, porous, quartzose sandstone; Glen Park Limestone (max thickness 60 ft.)- light to medium gray, oolitic limestone with phosphatic bands and nodules. IN SOUTHEAST MO- (Middle Series), St. Laurent Limestone- (275 ft. max) gray limestone; Beauvais Sandstone- 980 ft. max) quartz sandstone; Grand Tower Limestone- (250 ft. max) gray limestone; (Lower Series), Clear Creek Chert- (300 ft. max) chert; Little Saline Limestone- (100 ft. max) white limestone; Grassy Knob Chert- (max thickness ?)- chert; Bailey FM- (300 ft. max) cherty limestone with some shale. Summary- mostly limestone and sandstone with some shale and chert
Primary rock type	limestone
Secondary rock type	sandstone
Other rock types	shale; chert
Lithologic constituents	Major Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Carbonate > Limestone (Bed) Minor Sedimentary > Chemical > Chert (Bed) Sedimentary > Clastic > Mudstone > Shale (Bed)
Map references	Middendorf, M. A., and others, 2003, Geologic Map of Missouri: Missouri Geological Survey. Scale 1:500K
Unit references	Howe, W. B. and Koenig, 1961, The Stratigraphic Succession in Missouri: Missouri Geological Survey and Water Resources, Vol XL. 2nd Series.
Geographic coverage	Bollinger - Boone - Callaway - Cape Girardeau - Cooper - Franklin - Gasconade - Greene - Jefferson - Lincoln - McDonald - Maries - Marion - Moniteau - Montgomery - Morgan - Perry - Pettis - Phelps - Pike - Ralls - Saint Charles - Sainte Genevieve - Saint Louis - Saline - Scott - Warren