As shown in figure a5-3, the mt. polley map area is almost entirely underlain by quesnel terrane rocks, although small parts of two other terranes also are represented on the map—the cache creek terrane in the southwest and the kootenay terrane in the northeast. most of the quesnel terrane in this area is volcanic and sedimentary in origin.
what type of rocks make up the cache creek terrane in this area, and how old are they? (3 points)
what type of rocks make up the kootenay terrane in this area, and how old are they? (3 points)
when the quesnel terrane was accreted onto north america in the early jurassic (at around 185 ma), it already included some intrusive igneous rocks, but other intrusions appeared later. identify the post-accretion intrusive(s) and indicate their age(s). (3 points)
some sedimentary and volcanic rocks and some still-unconsolidated sediments were deposited in this region after the terrane accretion events. identify these units, and indicate their ages and the types of materials. (6 points)