REFERENCE Large land and aquatic mammals appear; global warming; comet impact in Chesapeake Bay; Antarctica begins to ice over; modern-day continental positions are reached; many kinds of primates appear (almost as many go extinct); an island continent finally disappears for good; the Mediterranean valley turns into the Mediterranean Sea; advanced primates begin using fire when it becomes available from nearby lightning strikes or other natural sources; much of the Pacific Rim suffers a massive tsunami when a chunk of Hawaii slides into the ocean

REFERENCE Large land and aquatic mammals appear; global warming; comet impact in Chesapeake Bay; Antarctica begins to ice over; modern-day continental positions are reached; and more...has been reorganized and moved to
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