The dikes of the region contain plagioclase, horneblende, and augite and are therefore andesitic. The size and dominance of crystals in these rock bodies vary from outcrop to outcrop. This is due to the presence of a series of dikes, each occuring at different times, the latest ones cutting into the earlier. Dikes cap certain hills in the mapping region, or are repeated continiously down and along a saddle between two peaks. The latter occurance can be interpretted as a set of radial dikes, each of which came from the same magma chamber, which in this case would be that which was located below the Ancestral Sunlight Volcano.
Rocks containing volcanic clasts in a muddy, volcanic matrix are remnants of lahars.
Not as common as dikes in this region, lahars are alligned with dikes on some peaks and along saddles in the mapping area. The clast size within lahars vary from flow to flow, and in some places seem to grade from small to larger stratigraphically upward. This represents the presence of seperate lahars occuring each after the previous. Eocene Volcanism occured elsewhere, outside of the mapping area, in close approximity with the Ancestral Sunlight Volcano. This is evident due to the presence of radiating dikes, which typically occur around a volcanic center.