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MVP #31: An Andean mystery solved

Explore the San Pedro Ignimbrite and its relation to La Poruña and Cerro Polapi in the Andes. Discover insights on active volcanoes!

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So, I said that I was going to try to make MVP #31 a little harder than some of the last few Mystery Volcano Photos, and I was right. In fact, we actually have to split the points for this one between two Eruptions readers - Robin, who gets the main three features and the Bobs who got the distant volcano, which was especially hard. Congratulations to both!

Below is the (now annotated) original image where I asked you to identify not only the scoria cone, but the volcano in the background and the unit in the foreground. Here is what I am sure of: the scoria cone is La Poruña (see top left for another view), the unit in the foreground is the San Pedro Ignimbrite (which Highway 21 cuts through in a drainage) and the near ridge in the background are lava flows from San Pedro. Now, this ...

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