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Middle Devonian

Middle Devonian
State Illinois
Name Middle Devonian
Geologic age Devonian
Comments The middle Devonian includes the following formations: Cedar Valley Limestone, Wapsipinicon Limestone, Alto-Blocher Shale, Lingle Limestone, Grand Tower Limestone, Dutch Creek Sandstone. Based on the stratigraphic column on the 1967 paper map, this part of the Devonian collectively consists of about 50% limestone (locally cherty), 20% dolomite, 25% shale, and 5% sandstone, with incidental anhydrite and breccia.
Primary rock type limestone
Secondary rock type shale
Other rock types dolostone (dolomite); sandstone; evaporite; sedimentary breccia;
Lithologic constituents
Major
Sedimentary > Carbonate > LimestoneThe middle Devonian includes the following formations: Cedar Valley Limestone, Wapsipinicon Limestone, Alto-Blocher Shale, Lingle Limestone, Grand Tower Limestone, Dutch Creek Sandstone. Based on the stratigraphic column on the 1967 paper map, this part of the Devonian collectively consists of about 50% limestone (locally cherty), 20% dolomite, 25% shale, and 5% sandstone, with incidental anhydrite and breccia.
Minor
Sedimentary > Clastic > Mudstone > ShaleThe middle Devonian includes the following formations: Cedar Valley Limestone, Wapsipinicon Limestone, Alto-Blocher Shale, Lingle Limestone, Grand Tower Limestone, Dutch Creek Sandstone. Based on the stratigraphic column on the 1967 paper map, this part of the Devonian collectively consists of about 50% limestone (locally cherty), 20% dolomite, 25% shale, and 5% sandstone, with incidental anhydrite and breccia.
Sedimentary > Carbonate > DolostoneThe middle Devonian includes the following formations: Cedar Valley Limestone, Wapsipinicon Limestone, Alto-Blocher Shale, Lingle Limestone, Grand Tower Limestone, Dutch Creek Sandstone. Based on the stratigraphic column on the 1967 paper map, this part of the Devonian collectively consists of about 50% limestone (locally cherty), 20% dolomite, 25% shale, and 5% sandstone, with incidental anhydrite and breccia.
Incidental
Sedimentary > Chemical > Evaporite > AnhydriteThe middle Devonian includes the following formations: Cedar Valley Limestone, Wapsipinicon Limestone, Alto-Blocher Shale, Lingle Limestone, Grand Tower Limestone, Dutch Creek Sandstone. Based on the stratigraphic column on the 1967 paper map, this part of the Devonian collectively consists of about 50% limestone (locally cherty), 20% dolomite, 25% shale, and 5% sandstone, with incidental anhydrite and breccia.
Sedimentary > Clastic > Sedimentary-brecciaThe middle Devonian includes the following formations: Cedar Valley Limestone, Wapsipinicon Limestone, Alto-Blocher Shale, Lingle Limestone, Grand Tower Limestone, Dutch Creek Sandstone. Based on the stratigraphic column on the 1967 paper map, this part of the Devonian collectively consists of about 50% limestone (locally cherty), 20% dolomite, 25% shale, and 5% sandstone, with incidental anhydrite and breccia.
Sedimentary > Clastic > SandstoneThe middle Devonian includes the following formations: Cedar Valley Limestone, Wapsipinicon Limestone, Alto-Blocher Shale, Lingle Limestone, Grand Tower Limestone, Dutch Creek Sandstone. Based on the stratigraphic column on the 1967 paper map, this part of the Devonian collectively consists of about 50% limestone (locally cherty), 20% dolomite, 25% shale, and 5% sandstone, with incidental anhydrite and breccia.
Map references
Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.
Unit references
Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.
Counties Adams - Alexander - Calhoun - Champaign - Douglas - Hardin - Henderson - Henry - Iroquois - Jackson - Mercer - Pike - Pulaski - Rock Island - Union