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Upper Devonian

Upper Devonian
State Illinois
Name Upper Devonian
Geologic age Devonian
Comments The upper Devonian includes the following formations: Louisiana Limestone, Saverton Shale, Grassy Creek Shale, Sweetland Creek Shale, Sylamore Sandstone. Based on the stratigraphic column on the 1967 paper map, these units together are about 10% sandstone, 20 % limestone, 40% shale, and 30% black shale.
Primary rock type shale
Secondary rock type black shale
Other rock types limestone; sandstone
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale > Black-shaleThe upper Devonian includes the following formations: Lousiana Limestone, Saverton Shale, Grassy Creek Shale, Sweetland Creek Shale, Sylamore Sandstone. Based on the stratigraphic column on the 1967 paper map, these units together are about 10% sandstone, 20 % limestone, 40% shale, and 30% black shale
Minor
Sedimentary > Clastic > SandstoneThe upper Devonian includes the following formations: Lousiana Limestone, Saverton Shale, Grassy Creek Shale, Sweetland Creek Shale, Sylamore Sandstone. Based on the stratigraphic column on the 1967 paper map, these units together are about 10% sandstone, 20 % limestone, 40% shale, and 30% black shale.
Sedimentary > Carbonate > LimestoneThe upper Devonian includes the following formations: Lousiana Limestone, Saverton Shale, Grassy Creek Shale, Sweetland Creek Shale, Sylamore Sandstone. Based on the stratigraphic column on the 1967 paper map, these units together are about 10% sandstone, 20 % limestone, 40% shale, and 30% black shale
Sedimentary > Clastic > Mudstone > ShaleThe upper Devonian includes the following formations: Lousiana Limestone, Saverton Shale, Grassy Creek Shale, Sweetland Creek Shale, Sylamore Sandstone. Based on the stratigraphic column on the 1967 paper map, these units together are about 10% sandstone, 20 % limestone, 40% shale, and 30% black shale
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 - Cook - Douglas - Ford - Hardin - Henderson - Henry - Iroquois - Jersey - Mercer - Piatt - Pike - Pulaski - Rock Island - Scott - Union - Vermilion - Warren