| C Carboniferous |
| Cm Cambrian |
| Czi Cenozoic intrusives |
| D Devonian |
| DSO Devonian Silurian Ordovician |
| Water |
| J Jurassic |
| JTr Jurassic Triassic |
| K Cretaceous |
| KJ Cretaceous Jurassic |
| Kv Cretaceous volcanics |
| Mz Mesozoic |
| MzCzi Mesozoic Cenozoic volcanics |
| MzCzv Mesozoic Cenozoic volcanics |
| MzPz Mesozoic Paleozoic |
| OCm Ordovician Cambrian |
| P Permian |
| Pz Paleozoic |
| PzpC Paleozoic Precambrian |
| Q Quaternary |
| QT Quaternary Tertiary |
| QTv Quaternary Tertiary volcanics |
| Qe Quaternary, eolian |
| Qf Quaternary, fluvial |
| Qsk Quaternary, sahbka |
| Qv Quaternary volcanics |
| T Tertiary |
| TK Tertiary Cretaceous |
| TKi Tertiary Cretaceous intrusives |
| TKv Tertiary Cretaceous volcanics |
| Tr Triassic |
| TrP Triassic Permian |
| pC Precambrian undifferentiated |
