Staff field trip to Thornton Quarry, Cook County
15 photographs, no negatives;
Geology, Stratigraphic - Silurian;
Geology, Stratigraphic - Devonian;
Mines and minerals;
Cook County, Illinois;
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 firstname.lastname@example.org Monday thru Friday, 8am-noon or 1pm-5pm.