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Quaternary | Pennsylvanian | Mississippian (Middle) | Mississippian (Lower) | Devonian (Middle & Lower) | Silurian (Upper & Lower) | Ordovician (Middle & Lower)
| System | Drawer # | Lithic Type | County | County Exp. # | Cat. # | Heated | Exposure |
|---|---|---|---|---|---|---|---|
| Pennsylvanian | 10 | Bog Iron | Wapello | WP-A+ | 523 | + | |
| Mississippian (Middle) | 10 | Verdi | Henry | HN-7 | 7 | ||
| Mississippian (Middle) | 10 | Verdi | Henry | HN-7+ | 7 | + | |
| Mississippian (Middle) | 10 | Verdi | Henry | HN-B | 167 | C | |
| Mississippian (Middle) | 10 | Verdi | Henry | HN-B+ | 167 | + | C |
| Mississippian (Middle) | 10 | Verdi | Henry | HN-J | 360 | ||
| Mississippian (Middle) | 10 | Verdi | Henry | HN-J+ | 360 | + | |
| Mississippian (Middle) | 10 | Verdi | Henry | HN-L+ | 463 | + | |
| Mississippian (Middle) | 10 | Verdi | Van Buren | VB-E | 212 | Q | |
| Mississippian (Middle) | 10 | Verdi | Van Buren | VB-E+ | 212 | + | Q |
| Mississippian (Middle) | 10 | Croton Formation | Story | SR-A1 | 176 | O | |
| Mississippian (Middle) | 10 | Croton Formation | Story | SR-A1+ | 176 | + | O |
| Mississippian (Middle) | 10 | Croton Formation | Story | SR-A2 | 177 | O | |
| Mississippian (Middle) | 10 | Croton Formation | Story | SR-A2+ | 177 | + | O |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Henry | HN-6 | 6 | ||
| Mississippian (Middle) | 10 | Croton Chalcedonic | Henry | HN-6+ | 6 | + | |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Henry | HN-D | 175 | O | |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Henry | HN-D+ | 175 | + | O |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Henry | HN-H | 308 | T | |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Jefferson | HN-H+ | 308 | + | T |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Jefferson | JF-D1 | 199 | Q | |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Jefferson | JF-D1+ | 199 | + | Q |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Jefferson | JF-D2 | 211 | Q | |
| Mississippian (Middle) | 10 | Croton Chalcedonic | Jefferson | JF-D2+ | 211 | + | Q |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Jefferson | JF-E | 201 | ||
| Mississippian (Middle) | 11 | Croton Chalcedonic | Jefferson | JF-E+ | 201 | + | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Jefferson | JF-F | 204 | C | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Jefferson | JF-F+ | 204 | + | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Lee | LE-E | 511 | ||
| Mississippian (Middle) | 11 | Croton Chalcedonic | Lee | LE-E + | 511 | + | |
| Croton Chalcedonic | Lee | LE-F | 512 | ||||
| Croton Chalcedonic | Lee | LE-F+ | 512 | + | |||
| Mississippian (Middle) | 11 | Croton Chalcedonic | Louisa | LA-B2 | 80 | S | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Louisa | LA-B2+ | 80 | + | S |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Louisa | LA-C+ | 81 | + | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Mahaska | MK-A | 178 | S | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Mahaska | MK-A+ | 178 | + | S |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Story | SR-B1 | 252 | ||
| Mississippian (Middle) | 11 | Croton Chalcedonic | Van Buren | VB-C | 210 | ||
| Mississippian (Middle) | 11 | Croton Chalcedonic | Van Buren | VB-C+ | 210 | + | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Van Buren | VB-E | 212 | ||
| Mississippian (Middle) | 11 | Croton Chalcedonic | Van Buren | VB-E+ | 212 | + | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Van Buren | VB-F | 102 | S | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Van Buren | VB-F+ | 102 | + | S |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Washington | WS-A | 166 | S | |
| Mississippian (Middle) | 11 | Croton Chalcedonic | Washington | WS-A+ | 166 | + | S |
| Mississippian (Middle) | 11 | Croton Banded | Henry | HN-L | 462 | ||
| Mississippian (Middle) | 11 | Croton Banded | Henry | HN-L+ | 462 | + | |
| Mississippian (Middle) | 11 | Croton Banded | Jefferson | JF-C | 172 | R | |
| Mississippian (Middle) | 11 | Croton Banded | Jefferson | JF-C+ | 172 | + | R |
| Mississippian (Middle) | 12 | Unidentified Mississippian | Story | SR-M | 245 | ||
| Mississippian (Middle) | 12 | Unidentified Mississippian | Story | SR-M+ | 245 | + | |
| Mississippian (Middle) | 12 | Croton Banded | Washington | WS-B1 | 189 | S | |
| Mississippian (Middle) | 12 | Croton Banded | Washington | WS-B1+ | 189 | + | S |
| Mississippian (Middle) | 12 | Croton Banded | Van Buren | VB-G | 103 | S | |
| Mississippian (Middle) | 12 | Croton Banded | Van Buren | VB-G+ | 103 | + | S |
| Mississippian (Middle) | 12 | Croton Banded | Van Buren | VB-M | 103 | ||
| Mississippian (Middle) | 12 | Croton Banded | Van Buren | VB-M+ | 103 | + | |
| Mississippian (Middle) | 12 | Warsaw Tabular | Henry | HN-C | 173 | S | |
| Mississippian (Middle) | 12 | Warsaw Tabular | Henry | HN-C+ | 173 | + | S |
| Mississippian (Middle) | 12 | Warsaw Tabular | Jefferson | JF-A | 195 | S | |
| Mississippian (Middle) | 12 | Warsaw Tabular | Jefferson | JF-A+ | 195 | + | S |
| Mississippian (Middle) | 12 | Warsaw Tabular | Jefferson | JF-E | 201 | ||
| Mississippian (Middle) | 12 | Warsaw Tabular | Jefferson | JF-E+ | 201 | + | |
| Mississippian (Middle) | 12 | Keokuk | Appanoose | AN-A | 479 | ||
| Mississippian (Middle) | 12 | Keokuk | Appanoose | AN-A+ | 479 | + | |
| Mississippian (Middle) | 12 | Keokuk | Henry | HN-E | 266 | O | |
| Mississippian (Middle) | 12 | Keokuk | Henry | HN-E+ | 266 | + | O |
| Mississippian (Middle) | 12 | Keokuk | Henry | HN-F | 306 | O | |
| Mississippian (Middle) | 12 | Keokuk | Henry | HN-F+ | 306 | + | O |
| Mississippian (Middle) | 12 | Keokuk | Henry | HN-M | 504 | ||
| Mississippian (Middle) | 12 | Keokuk | Henry | HN-M+ | 504 | + | |
| Mississippian (Middle) | 12 | Keokuk | Lee | LE-A | 78 | C | |
| Mississippian (Middle) | 12 | Keokuk | Lee | LE-A+ | 78 | + | C |
| Mississippian (Middle) | 13 | Keokuk | Lee | LE-B2 | 79 | Q | |
| Mississippian (Middle) | 13 | Keokuk | Lee | LE-B2+ | 79 | + | Q |
| Mississippian (Middle) | 13 | Keokuk | Van Buren | VB-A+ | 149 | + | S |
| Mississippian (Middle) | 13 | Keokuk | Van Buren | VB-H | 123 | S | |
| Mississippian (Middle) | 13 | Keokuk | Van Buren | VB-H+ | 123 | + | S |
| Mississippian (Middle) | 13 | Keokuk | Van Buren | VB-I | 124 | O | |
| Mississippian (Middle) | 13 | Keokuk | Van Buren | VB-I+ | 124 | + | O |
| Mississippian (Middle) | 13 | Keokuk | Van Buren | VB-K | 205 | O | |
| Mississippian (Middle) | 13 | Keokuk | Van Buren | VB-K+ | 205 | + | O |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-B | 74 | O | |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-B+ | 74 | + | O |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-C | 75 | S | |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-C+ | 75 | + | S |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-D | 87 | Q | |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-D+ | 87 | + | Q |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-E | 256 | C | |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-E+ | 256 | + | C |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-F1 | 151 | O | |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-F1+ | 151 | + | O |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-F+ | 208 | + | O |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-G | 209 | O | |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-G+ | 209 | + | O |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-H | 287 | O | |
| Mississippian (Middle) | 13 | Burlington | Des Moines | DM-H+ | 287 | + | O |
| Mississippian (Middle) | 14 | Burlington | Henry | HN-G | 307 | T | |
| Mississippian (Middle) | 14 | Burlington | Henry | HN-G+ | 307 | + | T |
| Mississippian (Middle) | 14 | Burlington | Des Moines | DM-I | 483 | ||
| Mississippian (Middle) | 14 | Burlington | Des Moines | DM-I+ | 483 | + | |
| Mississippian (Middle) | 14 | Burlington | Henry | HN-I | 310 | ||
| Mississippian (Middle) | 14 | Burlington (Keokuk?) | Henry | HN-I+ | 310 | + | T |
| Mississippian (Middle) | 14 | Burlington | Louisa | LA-B1 | 76 | S | |
| Mississippian (Middle) | 14 | Burlington | Louisa | LA-B1+ | 76 | + | S |
| Mississippian (Middle) | 14 | Burlington | Louisa | LA-D | 197 | Q | |
| Mississippian (Middle) | 14 | Burlington | Louisa | LA-D+ | 197 | + | Q |
| Mississippian (Middle) | 14 | Burlington | Louisa | LA-E | 150 | Q | |
| Mississippian (Middle) | 14 | Burlington | Louisa | LA-E+ | 150 | + | Q |
| Mississippian (Middle) | 14 | Burlington | Lee | LE-B1 | 77 | Q | |
| Mississippian (Middle) | 14 | Burlington | Lee | LE-B1+ | 77 | + | Q |
| Mississippian (Middle) | 14 | Burlington | Lee | LE-D | 115 | O | |
| Mississippian (Middle) | 14 | Burlington | Lee | LE-D+ | 115 | + | O |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-B2 | 187 | O | |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-B2+ | 187 | + | O |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-C | 44 | O | |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-C+ | 44 | + | O |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-C1 | 188 | O | |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-C1+ | 188 | + | O |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-D | 190 | O | |
| Mississippian (Lower) | 14 | Wassonville | Washington | WS-D+ | 190 | + | O |
