<P> Devils Postpile National Monument is located near Mammoth Mountain in eastern California . The national monument protects Devils Postpile , an unusual rock formation of columnar basalt . Devils Postpile National Monument encompasses 798 acres ( 323 ha ) and includes two main tourist attractions : the Devils Postpile formation and Rainbow Falls , a waterfall on the Middle Fork of the San Joaquin River . In addition , the John Muir Trail and Pacific Crest Trail merge into one trail as they pass through the monument . Excluding a small developed area containing the monument headquarters , visitor center and a campground ; the National Monument lies within the borders of the Ansel Adams Wilderness . </P>
<P> Devils Postpile National Monument is located near Mammoth Mountain in eastern California . The national monument protects Devils Postpile , an unusual rock formation of columnar basalt . Devils Postpile National Monument encompasses 798 acres ( 323 ha ) and includes two main tourist attractions : the Devils Postpile formation and Rainbow Falls , a waterfall on the Middle Fork of the San Joaquin River . In addition , the John Muir Trail and Pacific Crest Trail merge into one trail as they pass through the monument . Excluding a small developed area containing the monument headquarters , visitor center and a campground ; the National Monument lies within the borders of the Ansel Adams Wilderness . </P>
what is devils postpile national monument in california
what is devils postpile national monument in california
an unusual rock formation of columnar basalt
an unusual rock formation of columnar basalt