PEEC Amateur Naturalist: Part 3 When White Rock was a Lake
By ROBERT DRYJA
Much of the Pajarito Plateau had been created as a result of two major events that occurred 1.2 and 1.6 million years ago. Volcanic eruptions at these times emptied a lava chamber of an estimated 145 cubic miles of material and created the Valles Caldera.
Part of this material was thrown skyward, eventually to be blown on the eastern side of the Sierra de los Valles mountains. Other material also flowed eastward over these mountains. The resulting layers of lighter or denser lava created the Pajarito Plateau. The magnitude Read More









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The gazebo in San Cristóbal de las Casas where marimba concerts take place almost every night. Photo by Sherry Hardage