| AD Precambrain-Devonian |
| APZ Precambrian-Paleozoic |
| C Carboniferous |
| CP Carboniferous-Permian |
| Cm Cambrian |
| CmO Cambrian-Ordovician |
| Cv Cretaceous-Tertiary volcanics |
| D Devonian |
| H2O Water |
| ICE Glacial Ice |
| J Jurassic |
| JK Jurassic-Cretaceous |
| K Cretaceous |
| MCi Mesozoic-Cenozoic intrusives |
| Mm Mesozoic metamorphics |
| Mv Mesozoic volcanics |
| OS Ordovician-Silurian |
| P Permian |
| PMi Paleozoic-Mesozoic intrusives |
| PZ Paleozoic |
| PZMZ Paleozoic-Mesozoic |
| PZm Paleozoic metamorphics |
| PZv Paleozoic volcanics |
| Pv Permian volcanics |
| Q Quaternary |
| Qv Quaternary volcanics |
| S Silurian |
| T Tertiary |
|
| Tr Triassic |
| TrJ Triassic-Jurassic |
|
| U Unmapped Area |
| pC Precambrian undifferentiated |
