Wells used as basement contour control (0)
| Ordovician and younger |
| Cambrian |
| Precambrian |
Basement faults (1)
| Generic fault-certain |
|
| Left-lateral strike-slip fault-certain |
|
| Normal fault-certain |
|
| Thrust fault-certain |
Basement contour lines (ft, mean sea level) (2)
| Index contour |
| Intermediate contour |
Basement elevation surface (ft, mean sea level) (4)
| 13,000 to 14,000 |
| 12,000 to 13,000 |
| 11,000 to 12,000 |
| 10,000 to 11,000 |
| 9,000 to 10,000 |
| 8,000 to 9,000 |
| 7,000 to 8,000 |
| 6,000 to 7,000 |
| 5,000 to 6,000 |
| 4,000 to 5,000 |
| 3,000 to 4,000 |
| 2,000 to 3,000 |
| 1,000 to 2,000 |
| 0 to 1,000 |
| -1,000 to 0 |
| -2,000 to -1,000 |
| -3,000 to -2,000 |
| -4,000 to -3,000 |
| -5,000 to -4,000 |
| -6,000 to -5,000 |
| -7,000 to -6,000 |
| -8,000 to -7,000 |
| -9,000 to -8,000 |
| -10,000 to -9,000 |
| -11,000 to -10,000 |
| -12,000 to -11,000 |
| -13,000 to -12,000 |
| -14,000 to -13,000 |
| -15,000 to -14,000 |
| -16,000 to -15,000 |
| -17,000 to -16,000 |
| -18,000 to -17,000 |
| -19,000 to -18,000 |
| -20,000 to -19,000 |
| -21,000 to -20,000 |
| -22,000 to -21,000 |
| -23,000 to -22,000 |
| -24,000 to -23,000 |
| -25,000 to -24,000 |
| -26,000 to -25,000 |
| -27,000 to -26,000 |
| -28,000 to -27,000 |
| -29,000 to -28,000 |
| -30,000 to -29,000 |
| -31,000 to -30,000 |
| -32,000 to -31,000 |
| -33,000 to -32,000 |
| -34,000 to -33,000 |
| Yellowstone |
|