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Lithics Home | Counties A-Z | Geologic Systems | Lithic Types | Chert Drawers | Lithics Program   Drawer # 4 System(s): Quaternary   Lithic Type:   Glacial Till Chert County(s):   Marion Lithic Type:   Glacial Till Chalcedony County(s):   Marion Lithic Type:   Tongue River Silica County(s):   Ringgold Lithic Type:   Glacial Till County(s):   Sac   (Rear) Glacial Till Sac Co. SA-A1   Glacial Till Sac Co. SA-A1+   Glacial Till Sac Co. SA-D1   Glacial Till Sac Co. SA-D1+   Tongue River Silica Ringgold Co. RN-A+ Glacial Till Sac Co. SA-A2   Glacial Till Sac SA-C+   Glacial Till Sac Co. SA-D2   Tongue River Silica Ringgold Co. RN-A Glacial Till Sac Co. SA-A2+   Glacial Till Sac Co. SA-C   Glacial Till Sac Co. SA-D2+   Glacial Till Chalcedony Marion Co. MA-B7+ Glacial Till Sac Co. SA-A3   Glacial Till Sac Co. SA-B2+   Glacial Till Sac Co. SA-D3   Glacial Till Chalcedony Marion Co. MA-B7 Glacial Till Sac Co. SA-A3+   Glacial Till Sac Co. SA-B2   Glacial Till Sac Co. SA-D3+ Image #2 Glacial Till Chert Marion Co. MA-B6+ Glacial Till Sac Co. SA-B1   Glacial Till Sac Co. SA-B1+   Glacial Till Sac Co. SA-D4     (Front) Updated by Tricia R. Bender, Web Designer Mary De La Garza, Web Master Click here to go back to the OSA homepage. Click here to go to The University of Iowa website.