Monday, May 12, 2008

Sunday was Pangaea Day

I circled a large area on the above map (Ron Blakey's map) to show where central Nevada might have been located on the supercontinent of Pangaea in the late Triassic, about 220 Ma. I think that much of Nevada was under water in the late Triassic, or consisted of a bunch of islands, but maybe not all of it - maybe there was some solid ground here way back then. It seems like accreted and obducted terranes came in, then more came in, then more, then... [that's a quick summary of Nevada's early geologic history, and not a very rigorous one, as you might be able to tell!).

So, the large yellow circle is my approximation (guess?) of where Nevada was on Pangaea in the late Triassic.

This post follows on with several other GeoBlogosphere posts, starting with Chris at Goodschist and then several others including Callan at NOVA Geoblog and Brian at Clastic Detritus. You can compare my large, ungainly yellow circle for the approximate location of central Nevada with Brian's small circle for the location of the Bay Area and see that at least they overlap!

Oh, and at least one more geoblogger has joined in - Chris at Highly Allochthonous.

And another one: Hypocentre at Hypo-Thesis.

1 comment:

hypocentre said...

I've had a go too at http://hypocentre.wordpress.com/2008/05/12/pangaea-geology-stylee/