Mt. polley in central british columbia. (mt. polley is about 75 km se of quesnel and 60 km ne of williams lake.) the following questions are based on information in the map legend and on the map itself:
what is the rock-type name for an early jurassic intrusive igneous rock in this area, and what does that name tell you about its composition? (2 points)
quartz monzonite- quartz insufficient amount, plagioclase feldspar, hornblende presents dark minerals.
on the scale of mafic-intermediate-felsic, how does that rock compare with the lower triassic mpd that shows up on cross-section b between bootjack lake and polley lake? (2 points)
felsic to intermediate.
volcanic rocks are listed with sedimentary rocks under "layered rocks." identify and provide the rock-type names for two different volcanic layers—one from the pleistocene, eocene, or miocene and one from the late triassic. (3 points)
the rock labelled ejt is described as a "latite tuff." what does that tell you about its geological origins? describe where you might find some of this rock on the map. (3 points)