Rhyolite Roadcut, Mt. Washburn
![](stops/rh.gif)
A road cut near Dunraven Pass, exposing a rhyolite conglomerate, provides an
excellent opportunity for a small exercise in relative dating. The clasts of
the clast-supported conglomerate show little rounding. A basaltic dike cuts through
the conglomerate, proving that it is younger than the conglomerate. Finally,
movement on a small fault offset both the conglomerate and the dike, making
this
event more recent than the deposition or the conglomerate and intrusion of the
basaltic
dike.