Where on (Google) Earth #447?

Just as Luis immediately recognized WoGE #445 as a place he had already visited, so I, upon seeing WoGE #446, thought #BTGT – “Been there, GigaPanned that”. I GigaPanned Bolinas Lagoon back in December 2008.

With no further delay, I present WoGE #447:

WoGE 447

The first person to successfully locate the coordinates and geologic significance of the scene above will have the opportunity to host the next WoGE on their own geoblog. No Schott Rule.

Happy searching!

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3 Responses to Where on (Google) Earth #447?

  1. Cataratas do Iguaçu! – 25°41′12″S 54°26′41″W

    Iguazu Falls have formed on the rim of the basaltic Paraná Plateau, Serra Geral Formation. This volcanic plateau formed in Lower Cretaceous period some 132 million years ago in an enormous volcanic eruption – possibly the largest eruption in the history of last several hundred million years. (source)

    Eruptions of basaltic lava broke through chasms in the Earth’s crust, forming spillways several kilometers high in layers several meters thick. The Iguaçu Falls are formed by three of these spillways mostly covered by water; a larger one, between 141 and 180 meters high, a smaller one, between 116 and 141 meters high, and an even smaller one, less than 116 meters high. The falls are formed in three steps by these spillways; one smaller fall and two higher ones.
    Due to water percolating through the basalt, spectacular amethysts (purple quartz) have formed, in spite of millions of years of chemical weathering, these mature minerals have withstood tropical tests of time. (source)

    Horizontal and vertical movement of the continental plates created vertical cracks in the basalt rock [...] a system of these faults runs through the Iguassu region. The principal channel of the Iguassu River runs through one of the faults where erosion has been more intense. [...] The erosion continues along the principal channel, but the very resistance of the basalt rock makes the changes almost imperceptible. (source)

    The edge of the basalt cap recedes by 3 mm (0.1 in) per year. (source)


    After seeing the waterfalls and find out that they were in the southern hemisphere, it was easy – I just looked at this list and voilá!

    • admin says:

      Well done, Luis! I expected this one would be relatively easy, but I was hoping for a nice explanation of the geologic controls at work here, and you did not disappoint.

      WoGE #448 is all yours.