Quote:
Originally Posted by jimjamuser
Actually. I imagine they know the ocean acidity levels back 50 Million years because they did core samples of ancient coral reefs. When reading the Smithsonian article I found out that living coral form rings just like ancient redwood trees do. I assume from that and core samples they can date the rings and come to the conclusion back to 50 Million years. And I enjoyed learning that !
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It doesn’t work that way