https://ir.uiowa.edu/igs_ofm/1024/thumbnail.jp

Anderson, Raymond R

Bunker, Bill J

Greeney, Sean

Ludvigson, Greg A

Pope, John P

Witzke, Brian J

English

Iowa Research Online

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R20W R19W
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T82N
T81N
T80N
T79N
T78N
T77N
T76N
T75N
T74N
T73N
T72N
T71N
T70N
T69N
T68N
T67N
T79N
T80N
T81N
T77N
T76N
T75N
T74N
T82N
T83N
T84N
T85N
T78N
0 5 10 15 20 25 Miles
when printed at 36" x 42" format
scale   1:250,000
0 5 10 15 20 25 30 35 40 Kilometers
POLK
ADAIR
BOONE
DALLAS
MARION
WAYNE
GREENE
UNION
GUTHRIE
LUCAS
WARRENMADISON
DECATURRINGGOLD
MONROECLARKE
APPANOOSE
Rock Exposures in the Study Area
Areas of bedrock exposure or bedrock surface within soil horizon
Index Showing Area of Geologic Map
Prepared by the Iowa Department of Natural Resources
Iowa Geological Survey, June 2002
Open File Map 02-1
Prepared under the STATEMAP program, in cooperation with the
U.S. Geological Survey, Department of Interior, Supported by
Cooperative Agreement 01-HQAG-0091
prepared by
Iowa Geological Survey
June 2002
John P. Pope, Brian J. Witzke, Raymond R. Anderson
Greg A. Ludvigson, Bill J. Bunker, Sean Greeney
DIGITAL GEOLOGIC MAP OF IOWA
PHASE 4:  SOUTH-CENTRAL IOWA
LEGEND
Descriptions of Rock Units
Pc
Msp
Ma
Pl
Pk
Pm
Pb
Ps
Pd
Kd
 
 
Cherokee Group: lower Middle Pennsylvanian (Atokan-Desmoinesian).  Maximum thickness: 462 ft. 
(141 m) in Marion County. Primary lithologies: shale, light-dk gray, part silty, part sandy; sandstone vf-m. 
Secondary lithologies: shale, black, carbonaceous, part phosphatic; coal; mudstone, light gray to red. 
Minor: limestone, fossiliferous; sandstone, coarse; conglomerate, sandstone/siltstone/limestone clasts; 
siderite, pellets and concretions; pyrite.  
 
 
 
 
MISSISSIPPIAN 
 
 
 “St. Louis” and Pella fms.:  Middle Mississippian (Meramecian).  Maximum thickness 150 ft (45 m); 
beveled to truncated beneath sub-Pennsylvanian unconformity.  Primary lithologies: dolomite, part sandy; 
limestone, part sandy to fossiliferous; sandstone; green-gray shale, calcareous.  Secondary lithologies:  
gypsum/anhydrite; limestone/dolomite breccia; oolitic limestone.  Minor:  chert, chalcedony. 
 
 
Augusta Group:  Includes Burlington, Keokuk, Warsaw fms.; Middle Mississippian (Osagean).  
Maximum thickness 190 ft (58 m); locally beveled beneath sub-“St. Louis” and sub-Pennsylvanian 
unconformities.  Primary lithologies:  dolomite, part argillaceous; dolomitic limestone.  Secondary 
lithologies:  limestone, crinoidal packstone; green-gray shale; glauconitic dolomite; chert, nodular to 
bedded.  Minor:  chalcedony, quartz geodes. 
 
 
 
CRETACEOUS 
 
Dakota Formation:  Cretaceous (upper Albian and / or Cenomanian). Maximum thickness 150 feet (46 
m) across northwestern map area in Greene, Guthrie, and Adair counties. Primary lithologies: sandstone, 
very fine- to coarse-grained, part pebbly to conglomeratic, part cemented by iron oxides; mudstone pale to 
medium gray, black (carbonaceous), red and pink.  Secondary lithologies: chert residuum/gravel, siderite 
pellets in mudstones. 
 
 
 
 
 
PENNSYLVANIAN 
 
Shawnee Group: (middle Virgilian) upper Upper Pennsylvanian. Max thickness: 180 ft. (55 m) in Adair 
County.  Primary lithologies: limestone, fossiliferous; shale, light-dk gray. Secondary lithologies: 
mudstone, light-dk gray. Minor: shale, black, phosphatic; mudstone, red; coal.  
 
 
Douglas Group: (latest Missourian-early Virgilian) lower Upper and upper Upper Pennsylvanian. Max 
thickness: 116 ft. (35 m) in Union County. Primary lithologies: shale, light-dk gray; siltstone. Secondary 
lithologies: limestone, fossiliferous; mudstone, light-dk gray. Minor: shale, black, phosphatic; mudstone, 
red; coal.  
  
 
 
 
Lansing Group: (late Missourian) lower Upper Pennsylvanian. Max thickness: 78 ft. (24 m) in Union 
County. Primary lithologies: shale, light-dk gray; limestone, fossiliferous. Secondary lithologies: shale, 
black, phosphatic; mudstone, light-dk gray, red. Minor: siltstone.  
 
 
Kansas City Group: (middle Missourian) lower Upper Pennsylvanian. Max thickness: 125 ft. (38 m) in 
Ringgold County. Primary lithologies: shale, light-dk gray; limestone, fossiliferous. Secondary lithologies: 
shale, black, phosphatic; mudstone, gray-green to light gray. Minor: mudstone, red; coal.  
 
 
Bronson Group: (early Missourian-latest Desmoinesian) lower Upper and uppermost Middle 
Pennsylvanian. Max thickness: 110 ft. (34 m) in Madison County. Primary lithologies: shale, light-dk 
gray; limestone, fossiliferous. Secondary lithologies: shale, black, phosphatic; mudstone, gray-green to 
light gray. Minor: siltstone; sandstone, f-m; coal; mudstone, red.  
 
 
M armaton Group: (late Desmoinesian) upper Middle Pennsylvanian. Max thickness: 155 ft. (48 m) in 
Madison County. Primary lithologies: shale, light-dk gray; limestone, fossiliferous. Secondary lithologies: 
mudstone, light gray to red; sandstone, f-m; shale, black, phosphatic. Minor: siltstone; coal; conglomerate; 
pyrite.  
 
Description of Map Symbols
GEOLOGIC UNIT CONTACTS
BEDROCK WELL DATA POINT
COUNTY OR TOWN BOUNDARY
MAJOR HIGHWAY
Interstate Route
U.S. Route
State Route
TOWNSHIP BOUNDARY
LAKE, RIVER, OR STREAM
#
FAULT ZONE
         (DASHED WHERE INFERRED)
35
65
2


Bedrock geology of south-central Iowa, Digital geologic map of Iowa, Phase 4: South-Central Iowa

https://ir.uiowa.edu/cgi/viewcontent.cgi?article=1024&amp;context=igs_ofm

Bedrock geology of south-central Iowa, Digital geologic map of Iowa, Phase 4: South-Central Iowa

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