| Q - Quaternary Surficial deposits, undivided (0-2 Ma) |
| QTb - Holocene to Middle Pliocene Basaltic Rocks (0-4 Ma) |
| QTv - Holocene to Middle Pliocene Volcanic Rocks (0-4 Ma) |
| Qr - Holocene River Alluvium (0-10 ka) |
| Qy - Holocene Surficial Deposits (0-10 ka) |
| Qm - Late And Middle Pleistocene Surficial Deposits (10-750 ka) |
| Qo - Early Pleistocene to Latest Pliocene Surficial Deposits (0.75-3 Ma) |
| QTs - Early Pleistocene to Late Miocene Basin Deposits (0.75-10 Ma) |
| Tvy - Pliocene to Middle Miocene Volcanic Rocks (2-12 Ma). |
| Tsy - Pliocene to Middle Miocene Deposits (2-16 Ma) |
| Tby - Pliocene to Late Miocene Basaltic Rocks (4-8 Ma) |
| Tb - Late to Middle Miocene Basaltic Rocks (8-16 Ma) |
| Tsv - Middle Miocene to Oligocene Volcanic And Sedimentary Rocks, Undivided (11-32 Ma) |
| Tsm - Middle Miocene to Oligocene Sedimentary Rocks (11-32 Ma) |
| Tv - Middle Miocene to Oligocene Volcanic Rocks (11-38 Ma) |
| Tg - Middle Miocene to Oligocene Granitic Rocks (14-26 Ma) |
| Ti - Middle Miocene to Oligocene Shallow Intrusions (14-35 Ma) |
| TXgn - Tertiary to Early Proterozoic Gneissic Rocks (15-1800 Ma) |
| Tso - Oligocene to Paleocene[?] Sedimentary Rocks (30-65 Ma) |
| TKgm - Early Tertiary to Late Cretaceous Muscovite-Bearing Granitic Rocks (50-80 Ma) |
| TKg - Early Tertiary to Late Cretaceous Granitic Rocks (50-82 Ma). |
| Kv - Early Tertiary to Late Cretaceous Volcanic Rocks (50-82 Ma) |
| KJo - Orocopia Schist (Cretaceous - Jurassic, 65-165 Ma) |
| KJs - Cretaceous to Upper Jurassic Sedimentary Rocks with Minor Volcanic Rocks (80-160 Ma) |
| Kmv - Sedimentary Rocks of the Upper Cretaceous Mesaverde Group (84-88 Ma) |
| Ks - Cretaceous Sedimentary Rocks (about 88-97 Ma) |
| Jm - Morrison Formation (Late Jurassic, about 145-160 Ma) |
| Jsv - Jurassic Sedimentary and Volcanic Rocks (150-170 Ma) |
| Jg - Jurassic Granitic Rocks (150-180 Ma) |
| Jv - Jurassic Volcanic Rocks (160-200 Ma) |
| J^ - Jurassic And Triassic Sedimentary and Volcanic Rocks (160-240 Ma) |
| }| - Jurassic to Cambrian Metamorphosed Sedimentary Rocks (160-540 Ma) |
| Js - San Rafael Group (Late to Middle Jurassic, about 160-180 Ma) |
| Jgc - Glen Canyon Group (Early Jurassic, about 180-210 Ma). |
| ^c - Chinle Formation (Late Triassic, 210-230 Ma) |
| ^cs - Shinarump Conglomerate Member |
| ^m - Moenkopi Formation (Middle(?) and Early Triassic, 230-245 Ma) |
| | - Paleozoic Sedimentary Rocks (248-544 Ma) |
| P - Permian Sedimentary Rocks (270-280 Ma) |
| P* - Permian to Pennsylvanian Sedimentary Rocks (280-310 Ma) |
| M_ - Mississippian, Devonian, And Cambrian Sedimentary Rocks (330-540 Ma) |
| Ys - Middle Proterozoic Sedimentary Rocks (700-1300) |
| Yd - Middle Proterozoic Diabase (1050-1150 Ma) |
| YXg - Proterozoic Granitic Rocks (1400-1800 Ma) |
| Yg - Middle Proterozoic Granitic Rocks (1400-1450 Ma) |
| Xg - Early Proterozoic Granitic Rocks (1600-1800 Ma) |
| Xms - Early Proterozoic Metasedimentary Rocks (1600-1800 Ma) |
| Xq - Early Proterozoic Quartzite (1650? -1700 Ma) |
| Xmv - Early Proterozoic Metavolcanic Rocks (1650 to 1800 Ma) |
| Xm - Early Proterozoic Metamorphic Rocks (1600-1800 Ma) |