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The side of Lassen Peak is made up of volcanic rock.  The large rock formations are called spines, formed when lab broke through the volcano's outer surface and pushed skyward.

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The side of Lassen Peak is made up of volcanic rock. The large rock formations are called spines, formed when lab broke through the volcano's outer surface and pushed skyward.  

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Lassen Peak Trail

2.5 mi 4.1 km
 27
Shingletown, CA