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Geology LibreTexts

21: Geological History of Western Canada (Exercises)

Q21.1 Finding the Geological Provinces of Canada

[SE after Geological Survey of Canada]

Q21.2 Purcell Rocks Down Under?

The Mesoproterozoic quartzite phyllite schist of Tasmania may correlate with the Purcell rocks of Canada. The main difference is that while the Tasmanian rocks are metamorphosed, the Purcell rocks are generally unmetamorphosed.

Q21.3 What Is Vancouver Island Made Of?

1) Less than 10% of Vancouver Island is Paleozoic (the Devonian volcanic rocks – Dv)

2) The most common rock type is the Triassic Karmutsen Volcanic rock (basalt – Tv). The most common rocks by age are the Mesozoic rocks (Jurassic volcanic, Jurassic granite and Triassic volcanic)

[SE]

Q21.4 Dinosaur Country?

This Cretaceous Dinosaur Park Formation sandstone is clearly cross-bedded implying that it was deposited in a stream environment.

Q21.5 The Volume of the Paskapoo Formation

1) The 60,000 km2 area of source rock would have to have been eroded to a depth of 750 m to create 45,000 km3 of sediment

2) 500 m is 500,000 mm so the rate is 500,000 mm/ 4,000,000 years = 0.125 mm/year