| Unit List |
| Q4 Alluvium (latest Holocene) |
| Q3c Alluvium (Holocene) |
| Q3b Alluvium (Holocene to late Pleistocene) |
| Q3bc Alluvium (Holocene to late Pleistocene) |
| Q3a Alluvium (late Pleistocene) |
| Q2d Alluvium (late Pleistocene) |
| Q2c Alluvium (late Pleistocene) |
| Q2b Alluvium (late Pleistocene) |
| Q2a Alluvium (middle to late Pleistocene) |
| Qs Eolian sand (Holocene to late Pleistocene) |
| Qp Playa deposits (Holocene to late Pleistocene) |
| B Bedrock, undivided |
| V Extrusive volcanic rocks, undivided |
