| State | Illinois |
|---|---|
| Name | New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone |
| Geologic age | Middle Devonian (Givetian) to Upper Devonian (Fammenian) |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)Shale can be sandy and dolomitic.
Minor
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
|
| Comments | Thickness from stratigraphic columns: New Albany Sh (0-460’) in southern Illinois (south of 40 degrees north latitude); New Albany Fm (0-300’) in northern Illinois (north of 40 degrees north latitude). Based on the stratigraphic columns, the New Albany Shale in southern Illinois is part of the Knobs Group and is comprised, from oldest to youngest, of the Sylamore Ss, "Hardin", Blocher Sh, Selmier Sh, Sweetland Creek Sh, Grassy Creek Sh, Saverton Sh, Louisiana Ls, Glen Park, and Hannibal Sh, and the New Albany Fm [sic] in northern Illinois is comprised, from oldest to youngest, of the Sylamore Ss, Grassy Creek-Sweetland Creek Sh undiff, Saverton Sh, and Hannibal Sh. [Oil well drillers' terms shown in quotation marks.] [*Note that the description of the map unit DMna in the map legend does NOT include the Mississippian-age Glen Park and Hannibal Shale -- they are mapped as a separate unit, Mk. The GIS (Esri shapefile IL_Geologic_Units_500K_2005_Py) uses 'Dmna ' to represent just the Devonian part of the New Albany Shale.] |
| Stratigraphic units | Hardin |
| References | Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000. |
| NGMDB product | |
| Counties | Adams - Alexander - Calhoun - Champaign - Douglas - Ford - Gallatin - Greene - Hardin - Henderson - Henry - Iroquois - Jersey - Mercer - Pike - Pulaski - Rock Island - Saline - Scott - Union - Vermilion - Warren |