These mountains are examples of "puys", and are the plugs of long-extinct volcanoes. A volcanic plug is the solidified lava material from the actual volcano opening. The rest of the volcano has eroded away, leaving just these lava columns.
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These mountains are examples of "puys", and are the plugs of long-extinct volcanoes. A volcanic plug is the solidified lava material from the actual volcano opening. The rest of the volcano has eroded away, leaving just these lava columns.
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