ONE FIFTH OF HISTORY RIPPED OUT. “Believe it or not, the geology at the bottom of the Grand Canyon is extraordinarily common. There, layers of sedimentary rock lie flat atop angled layers of significantly more ancient metamorphic rock. The gap there is enormous—if Earth’s rocks constitute a book of the planet’s history, there are about a billion pages missing. The story only picks up again around 540 million years ago in the Cambrian period, with an evolutionary explosion of complex life just as remarkable as the sudden change in the rock.”
https://lnkd.in/dtYSB5v
linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022