| They are marked by eruptions of cooler, stickier lavas such as andesite, dacite and rhyolite. |
| 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. |
| The conglomerate was deposited in tributary stream channels, and the pebbles consist almost entirely of quartz-feldspar phenocrystic rhyolite. |
| Interesting specimens of rutile with bixbyite in rhyolite are reported from the vicinity of Marysvale, Utah. |
| The source of the conglomerate is believed to have been southerly, where an unweathered friable rhyolite was water-transported with minor abrasion. |
| South of the city of Isparta pyroclastic rocks are interbedded with rhyolite, trachyte, phonolite and lamproite flows. |
