Slimebeast said:
While landmasses to significantly move is a process that takes millions of years, doesn't it? |
yes, the ice cores aren't old enough (I'm pretty sure the oldest one we have goes ~800k years back and the oldest still preserved in the antarctic ice sheet might be about 1.5 million years old ), but those aren't the only way to determine past atmospheric compositions, although they are more accurate than other methods
coral/shell/brachiopod fossils and certain sediments, sedimentary facies for example can give good clues about those aswell