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Morro Rock is but one of thirteen ancient volcanic plugs that stretch submerged beneath the Pacific Ocean into distinctive peaks along Highway 101 just south of San Luis Obispo.
The volcanic plugs are made of igneous rock which is a much tougher rock and has not eroded away.
Geologically, the Law is a volcanic plug, formed around 335 million years ago and composed of phonolitic trachyte.
Some geologists believe Devils Tower began as a laccolith, a buried intrusion of igneous rock; others say it is a volcanic plug, the leftover spout of an extinct volcano.