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eman mostafa said... April 5, 2014 at 8:42 AM

it may be metamorphism of sandstone due the effect of T & p i think, but not a sedimentary one.

Enzo Venturieri said... July 17, 2014 at 7:13 PM

These formations are found in Brasil too, in the Parnaiba and Parana Basins.

Scott Engering said... April 20, 2015 at 3:32 PM

Here is some information about Cerros Koi y Choroi