Dubya
Senior Member
- Dec 29, 2012
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I said the circum-equatorial current ended in the Pliocene, not the Pleistocene and started in the Cretaceous. That means it was around for about 150 million years. I posted when it ended and gave links. Try doing some research for a change and stop wasting my time asking the same thing over and over!
I know what you said. I asked you to show me a graphic showing land masses in a position that would allow a circum equatorial current. I can't help but notice that you haven't provided one.
I have done the research dubya which is why I am asking the question. The research doesn't support the claim. It is you who is beliving on faith.
Again, lets see the graphic showing land masses in a position that would allow such a current.
Our present thermohaline circulation couldn't have existed with that circum-equatorial current, but to really understand why you would have to examine our present thermohaline circulation and see how heat is transferred around the planet. Don't you think packing 25 meters of sea level on ice sheets also has an effect on ocean currents?
You are simply assuming a circum equatorial current. The land masses clearly haven't allowed for any current that could be rationally called circum equatorial for more than 500 million years.
Once again, if you want to argue for a circum equatorial current, you are going to have to show me land masses in such a position to allow for such a current. So far, the fact that you haven't really hurts your argument.
The Pliocene was a major time of changes and one we know a lot about, because it wasn't that long ago.
The land masses were where they were dubya and clearly there was no possibility of a circum equatorial current with the land masses in those positions. Are you arguing that they were somewhere else? Lets see the grapic if you believe so.
A circum-equatorial current doesn't have to always be exactly at the equator, it just mainly follows the equator all the way around the world and continues itself. That's why it's a major warm current that would branch off and spread heat. You've posted maps prior to the Pliocene, so figure it out!
South America became linked to North America through the Isthmus of Panama during the Pliocene, making possible the Great American Interchange and bringing a nearly complete end to South America's distinctive large marsupial predator and native ungulate faunas. The formation of the Isthmus had major consequences on global temperatures, since warm equatorial ocean currents were cut off and an Atlantic cooling cycle began, with cold Arctic and Antarctic waters dropping temperatures in the now-isolated Atlantic Ocean.
Source: Pliocene - Wikipedia, the free encyclopedia