If this one doesn't scare you, you're already dead
Archaeology student.

"The granite you see here is 1.2 billions years old. The limestone laying directly on top of it is only 440 million years old. Somewhere in between we have lost 760 million years of Earth’s history and we don’t know where it went."
―Prof. Jim Buttle (via grahamburger)

(vía rat--queen)