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Machado Postpile

Machado Postpile is an ancient geological wonder which sits relatively hidden in the Eldorado National Forest, east of Silver Lake. Its unique structure was formed by lava deposits which naturally cracked into massive diabase columns upon cooling. Under ideal conditions, these columns would all be hexagonal, but nature is rarely so well-behaved; numerous 4- and 5-sided columns are readily found, along with other irregularities that provide a fascinating place to explore. This site is often called Machado Postpiles (plural), as there is a second set of pillars just east of the main collection. The name honors Jess Machado, who discovered the site in 1934.


Lichen-encrusted columns on the east face of Machado Postpile. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Massive columns on the east face of Machado Postpile show slight curvature. Eldorado National Forest, Sierra Nevada, Amador County, California.
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The tops of the columns at Machado Postpile make for an otherworldly landscape. Eldorado National Forest, Sierra Nevada, Amador County, California.
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The rusty-brown column crests provide a stark contrast to the light gray granite which surrounds Machado Postpile. Eldorado National Forest, Sierra Nevada, Amador County, California.
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A unique geological formation atop Machado Postpile provides a striking illustration of the molten lava that was once present. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Fallen columns lie at the base of Machado Postpile's erect pillars. Eldorado National Forest, Sierra Nevada, Amador County, California.
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The western face of Machado Postpile is comprised of vibrant, extraordinarily-shaped structures. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Unique geologic formations grace Machado Postpile's western face. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Remarkable patterns and structures abound at Machado Postpile. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Machado Postpile's northern tip under beautiful sunset lighting. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Machado Postpile, unique perspective looking down the steep eastern face from the top of the lichen-encrusted columns. Many fallen columns are visible on the ground below. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Top of hexagonal columns at Machado Postpile, landscape orientation. Eldorado National Forest, Sierra Nevada, Amador County, California.
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Top of hexagonal columns at Machado Postpile, portrait orientation. Eldorado National Forest, Sierra Nevada, Amador County, California.
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All images copyright Timothy Boomer. All rights reserved worldwide.