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Finer Resolution Plate Tectonics Movie
March 23, 2015
3:30 am
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BillT
Eugene, Oregon
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Here is a link to a new map (movie actually) of plate tectonics at 1 million year intervals.

I have an older one I got hold of that has 20 million year intervals.

 

http://news.sciencemag.org/ear.....tter-about

 

I find these kind of things interesting. For example, I can see what things looked like when the Danionins were originating, maybe 30-40 MY ago in South Asia (a geologically interesting area).

A related issue of interest is how the Cichlids ended up on S. America and Africa if they had not yet evolved until after the two continents split.

Bill Trevarrow [email protected]
April 10, 2015
11:24 am
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Matt
Málaga, Spain
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Nice link Bill. Isn't the common ancestor of cichlids a marine taxon? Perhaps that might help explain their evolution?

Cake or death?
April 11, 2015
1:49 am
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BillT
Eugene, Oregon
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Thanks Matt.

I think the ancestral cichlid was supposed to have been in Africa but some how migrated to S. America after they split.

One theory I recell is that the freshwater river outflow (Amazon and maybe Congo) made the then narrow S. Atlantic more fresh water so it was tolerable to the freshwater cichlids.

Bill Trevarrow [email protected]
April 23, 2015
2:21 pm
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Matt
Málaga, Spain
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So they may have crossed via a historically more brackish Atlantic? Interesting that quite a few extant cichlids are known to occur in similar conditions.

Cake or death?
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