Science Bulletins: The Rise of Oxygen

Follow geologists as they hunt for, pickaxe, and test rock samples from the 2.5 billion year old Huronian Supergroup, a sedimentary formation in Ontario, Canada. The scientists are in search of an exact record of how much oxygen gas Earth's developing atmosphere contained at key moments in geologic time. These crustal relics, which have interacted directly with ancient atmospheres, have the power to tell scientists when and how the Earth built up its incredible life-support system to foster more and more complex organisms.

[@smitty2868]

Nice informative upload. Kudos to the group who were in it and those who filmed it!

[@BryanLawlor]

What's the signature sulfur compound that indicates the mixture of SO2 + O3?

[@popflorian2991]

How can be prooved that glacial deposits are 7 miles thick?
Crystalline basement is not horizontal?

[@stevenbaumann8692]

Route 638 and Trans-Canada 17?