Devonian and Silurian in Crawford County, Illinois
Summary description of sample cuttings from Devonian and Silurian limestones from the bottom of the Sweetland Creek to the top of the Maquoketa;
Cited in Circular 220, "Unpublished Reports on Open File";
Manuscripts, maps, fieldnotes, and photographs may be viewed in-house only. Please contact the ISGS Special Collections Curator, Anne Huber, for an appointment at 217-300-0005 or email email@example.com Monday thru Friday, 8am-noon or 1pm-5pm.