|
| Material description | Code |
|
| I. Old Erosion Resistant Rocks (crystalline) | 100 |
- A. Igneous, volcanic (basalt, rhyolite, andesite, etc.)
| 110 |
| B. Igneous, plutonic (granite, granodiorite, etc.) | 130 |
| C. Metamorphic (schists, gneisses, quartzite, serpentinite, etc.) | 150 |
| II. Sedimentary Rocks | 200 |
| A. Shale | 210 |
| B. Siltstone | 220 |
| C. Sandstone | 230 |
| D. Conglomerate | 240 |
| E. Limestone | 250 |
| F. Eolianite (calcite-sand) | 260 |
| G. Mixed or varied lithology | 270 |
| III. Unconsolidated Sediments | 300 |
| A. Mud, Clay | 310 |
| B. Silt | 320 |
| C. Sand | 330 |
| D. Gravel, conglomerates | 340 |
| E. Glacial till | 345 |
| F. Glacial drift (fluvial-glacial) | 350 |
| G. Calcareous sediment | 360 |
| H. Mixed or varied lithology | 370 |
| IV. Recent Volcanic Materials | 400 |
| A. Lava | 410 |
| B. Ash, Tempera | 420 |
| C. Composite | 430 |
| V. Coral reef | 500 |
|
