Known for his outreach programs, Nick Eyles has taught geology at the University of Toronto for about 30 years. This book is the latest in a series in which he describes in detail the geologic history of Ontario, Canada, and the evolution of Earth’s continents in response to plate tectonics.

The introduction consists of a brief and lucid technical description of Ontario’s rock history, starting with the Canadian Shield and its three crustal blocks. The shield is comprised of formations created by volcanic intrusions into ancient sedimentary rocks, meteoric impacts, continental collisions, mid-continent rifts, and various mountain-building episodes. Through prolonged...

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