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Sign #8: "This huge, reddish-brown block of lava fell from the cliffs to the upper right. The lava cooled and hardened while it was still moving, resulting in dramatic fragmentation, known as "autobrecciation" (self broken)."

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Wendy Wheeler
Jun 3, 2018 near Orinda, CA
Sign #8: "This huge, reddish-brown block of lava fell from the cliffs to the upper right. The lava cooled and hardened while it was still moving, resulting in dramatic fragmentation, known as "autobrecciation" (self broken)."  

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