When did the Isthmus of Panama form between North and South America?

[admin]

The age of the Americas had out impacts globally, and its controversial timing has similarly large implications for science.

When did the Isthmus of Panama form between North and South America? : Read more

 

[oarmasw]

I think that with the Caribbean plate moving between the Americas more than one isthmus event could have occurred, 20-30Mya, followed by a break up, possibly as the Pebas sea in South America opened and filled in 7-10Mya. This was followed by the present isthmus 3Mya