What did the landscape of Ontario look like over two billion years ago? The answer is hidden in the rocks. On this episode, geologist Carolyn Hill (PhD Candidate in the Department of Earth Sciences) tells hosts Yimin and Greg why the Pre-Cambrian may not be the nicest place for time travellers to visit. Plus, we learn about how oxygen once almost killed off life on Earth!

Hosts: Yimin Chen & Gregory Robinson

Produced by Chantal Lemire