Holocene - Anthropocene (0)
| u - Urban land |
| f - Fill |
| cd - Coal mine dump |
| d - Mine dump/quarry dump/landfill |
| bp - Borrow pit |
| rp - Rock pit |
| sm - Coal surface mine |
| rsm - Reclaimed coal surface mine |
Holocene (1)
| ow - Open water |
| Qa - Alluvium |
| Qat - Alluvial terrace |
| Qaf - Alluvial fan |
| Qp - Peat bog |
| Qw - Wetland |
| Qls - Rock or land slide/flow |
Holocene - Pleistocene (2)
| Qc - Colluvium |
| Qsc - Stony colluvium |
| Qbc - Boulder colluvium |
Pleistocene -Wisconsinan (3)
| Qwic - Ice-contact stratified drift |
| Qwicl - Ice-contact stratified drift underlain by glacial lake clays |
| Qwo - Outwash |
| Qwt - Till |
| Qwtl - Till underlain by glacial lake clays |
| Qwv - Varves |
| Qwl - Loess |
Pleistocene - Illinoian (4)
| Qig - Sand and gravel |
| Qit - Till |
Pleistocene - Pre-Illinoian (5)
| Qpig - Sand and gravel |
| Qpit - Till |
Varied-Age Material (6)
| br - Bedrock |
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