| South of the city of Isparta pyroclastic rocks are interbedded with rhyolite, trachyte, phonolite and lamproite flows. |
| The conglomerate was deposited in tributary stream channels, and the pebbles consist almost entirely of quartz-feldspar phenocrystic rhyolite. |
| The age of the K-bentonite event is statistically indistinguishable from the age of the Chaschuil rhyolite. |
| These structures may be evidence of early nucleation and devitrification that preceded that in the surrounding host rhyolite. |
| A well-known locality for agate or chalcedony nodules in rhyolite is near the Twin Mountains, northwest of Del Norte in Saguache County. |
| The first few of these volcanic necks are identified as rhyolite, a light colored rock. |
