| South of Tricouni Peak are andesite and dacite lava flows that form two non-overlapping sequences. |
| The lava dome is made of dacite, a fine-grained volcanic rock that contains a sprinkling of larger, visible crystals, like chopped fruit in a cake. |
| The canyon is carved out of dacite, and there are some large trees with yellow and green leaves. |
| Here colorless to yellow crusts of mimetite coat open spaces and coarse fragments in brecciated dacite. |
| Unchallengeable examples of what are assumed to have been beta quartz appear to be limited to occurrences in silicic volcanic rocks, such as rhyolite, liparite, and dacite. |
| These are overlain by flows of rhyolite, dacite, and andesite totalling about 900 m in thickness. |
