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Author Topic:   fossil data superimposed on a map of pangea
Blue Jay
Member (Idle past 2719 days)
Posts: 2843
From: You couldn't pronounce it with your mouthparts
Joined: 02-04-2008


Message 12 of 16 (676612)
10-24-2012 10:42 AM
Reply to: Message 6 by eclectic1993
10-21-2012 3:19 PM


Hi, Eclectic.
I don't have a map for you, I'm afraid. I would be very interested in seeing a computer programmer put together a visual program for this, though.
I'm sure you've heard of this before, but there's a whole branch of biology called biogeography that's specifically about trying to understand patterns of animal distributions and correlating these patterns with evolutionary patterns.
For example, if you look at Eocene and Miocene rocks in South America, you see fossils of giant sloths, giant armadillos, terror birds and saber-toothed "marsupials." If you look at Eocene and Miocene rocks in North America, you see things like camels, deer, horses, elephants and saber-toothed cats.
Then, if you look at Pliocene rocks, you start to see some giant sloths in North America, and you see some camels, deer, horses, elephants and saber-toothed cats in South America. The terror birds and saber-toothed "marsupials" disappear.
Because of this observation, we conclude that North and South America must have been separated until the Pliocene. Then, in the Pliocene, the Isthmus of Panama formed, allowing animals to move between the continents. This is referred to as the Great American Interchange.
Interestingly, if you look at marine life on either side of the Isthmus of Panama (e.g., Alpheus shrimp), you see pairs of closely-related species separated by the isthmus. This suggests that these species used to live through the entire area, but each species was split into two isolated populations when the isthmus formed (a Pacific population and a Caribbean population), and these isolated populations evolved into separate species. (see page 2 of this lecture).
I know many other examples just like this. I would be very interested in seeing if you could put a large number of them together to create an animated visual aid that showcases the patterns of fossil occurrence. It would also be very informative for the evolution/creation debate.
I hope my comments helped.

-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.

This message is a reply to:
 Message 6 by eclectic1993, posted 10-21-2012 3:19 PM eclectic1993 has replied

Replies to this message:
 Message 13 by eclectic1993, posted 10-25-2012 1:56 AM Blue Jay has not replied

  
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