How to pronounce “paleozoic” in English

But in the way, way-- in the Paleozoic, you might have had just like algae that was mostly consumed higher up, so you would have a low oxygen

So here's is a reconstruction of what an early-ish ancestor of present day cephalopods might have looked like back in the Paleozoic.

These are the three main chunks of strata in the Grand Canyon: the Vishnu Basement Rocks, the Grand Canyon Supergroup, and the Layered Paleozoic Rocks.

The most famous gap in the Grand Canyon’s timeline happens along these two spots, where the Layered Paleozoic Rocks meet the Vishnu Basement Rocks—