What a great (and odd) volcanic formation! This area is called The Pinnacles. Here, two distinct layers of volcanic material was deposited. The white is dacite, topped by the grayish andesite. When superheated gases began to find its way through these rocks, they melted them, welding them into solid rock. This material was harder than the surrounding rock. When a river eroded the area, the welded rock remained, and these pinnacles were exposed.
Thursday, July 16, 2009
The Pinnacles
What a great (and odd) volcanic formation! This area is called The Pinnacles. Here, two distinct layers of volcanic material was deposited. The white is dacite, topped by the grayish andesite. When superheated gases began to find its way through these rocks, they melted them, welding them into solid rock. This material was harder than the surrounding rock. When a river eroded the area, the welded rock remained, and these pinnacles were exposed.
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