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Updated: June 13, 2025
The tops of the hills are often crowned with basaltic columns, and a soft porous amygdaloid abounds on the outskirts of the Mexican valley. Besides this, traces of more recent volcanic action abound, in the shape of numerous extinct craters in the high plateaus, and immense "pedrigals" or fields of lava not yet old enough for their surface to have been disintegrated into soil.
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