| The age of the K-bentonite event is statistically indistinguishable from the age of the Chaschuil rhyolite. |
| Interesting specimens of rutile with bixbyite in rhyolite are reported from the vicinity of Marysvale, Utah. |
| A well-known locality for agate or chalcedony nodules in rhyolite is near the Twin Mountains, northwest of Del Norte in Saguache County. |
| They are marked by eruptions of cooler, stickier lavas such as andesite, dacite and rhyolite. |
| The conglomerate was deposited in tributary stream channels, and the pebbles consist almost entirely of quartz-feldspar phenocrystic rhyolite. |
| These structures may be evidence of early nucleation and devitrification that preceded that in the surrounding host rhyolite. |
