photoblog : Suprada Urval Photography

Devil\’s Postpile NM

Devil\’s Postpile NM, by Suprada on Flickr.

Devil\’s Postpile National Monument, California.

Devil\’s Postpile is one of the finest examples of columnar basalt in the world. Quoting from the National Park Services website, \”Approximately 100,000 years ago, a lava flow erupted two miles upstream from the location of today\’s Monument. As it flowed down the Valley, it eventually ran into an obstruction which served as a dam to the lava\’s path. Pooling up to as deep as 400 feet behind the natural dam, the lava cooled. Conditions were such that the lava–that was incredibly uniform in its mineral composition–cooled at a very slow rate. As it cooled, it contracted and cracked, forming hexagonal columns. 80,000 years later, a glacier flowed through the same valley, overriding the formation and eventually revealing the sides and tops of the columns. Glacial polish can still be seen today at the top of the formation.\”

Technical Details:
Exposure: 1/15sec at f 8.0
Focal Length: 109mm
ISO: 200
WB: Daylight
Lens: Sigma 18.0-125.0 mm f3.5-5.6 DC
Time: 7:14 am
Camera: Canon Rebel XT

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