Zachary Wirth
My name is Zac, I'm 16, and I'm in the French Immersion IB program at Sir Winston Churchill Secondary. Some things I like to do are spend time outdoors doing activities such as hiking, backpacking, biking, and snowboarding. Although when I'm feeling lazy I like to sleep.
Option 3: Howe Sound Geologic History
Fact 1: 9,000 years ago, Opal Cone produced an unusually long 15 km dacite flow.
Located on the southeastern side of Mount Garibaldi, Opal Cone is the most recent activity at mount Garibaldi. Commonly, dacite flows travel short distances due to their high viscosity. Opal cones is a member of the Cascade Volcanoes, but is located in the Garibaldi Ranges and is not actually a part of the Cascade Range.
Fact 2: Mount Fee's jagged peak got its unique structure due to being massively eroded by glacial ice.
Just like many other peaks in the region, this peak is but a relic of what was once before it. Mount Fee is believed to have been a stratovolcano that was much higher in elevation and larger in size than it is currently. During periods of glaciation, a lot of the mountain's pyroclastic materials were eroded away by the ever-shifting ice and rock.
Fact 3: The Black Tusk is believed to be what's left of an extremely eroded volcano originally covered in pyroclastic material.
The volcano which formed 1.1-1.3 million years ago, slowly eroded over time and became how we know it today around 170,000 years ago. The Black Tusk is believed to have been the conduit of lava in a core rich in cinder. The peak is a part of the chain of volcanic peak that run from BC to California and were formed 35 million years ago as the plates were subducting under the North American Plate.
