An unusual volcano lies beneath the surface in a quiet Carlsbad neighborhood, hidden from plain sight. Mount Calavera, formed 22 million years ago during the collision of tectonic plates, showcases a unique plug dome formation with distinctive hexagonal columns. Geologists explain the formation process as a result of magma and gas expulsion, leaving behind a remarkable geological feature.
When most of us think of volcanoes, we think of molten lava spewing up from the earth and melting everything in its wake. So it may be hard to believe that in a quiet Carlsbad neighborhood lies an ancient and unusual volcano right below the ground.
These columns are similar to the ones normally found in national parks and monuments, which now carry famous names like Devils Tower in Wyoming and Devils Postpile in eastern California. Both are pictured below.Outstanding Formation of Columnar Basalt. The 60-foot-high sheer wall was exposed during the last glaciation. National Monument near Mammoth Lakes, California.
Big indeed. Great for walking, hiking, or biking, the Calavera Nature Preserve includes a 1.9 mile loop around the lake and stunning 360 views of North County and its coastline. Spanning over 100 acres with 4 miles of hiking and biking trails, Lake Calavera Preserve is one of San Diego's best-kept secrets, featuring a fascinating volcanic history you may not have known about — and the best part is, it’s easily accessible and completely free!
Volcano Geology Subduction Columnar Basalt Mount Calavera
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