Azusa Rock

A view of Azusa Rock, where Vulcan Materials has mined for decades. The large pyramid steps, left, in the face of the mountain would be prohibited under the new proposal.

( Irfan Khan / Los Angeles Times )

A view of Azusa Rock, where Vulcan Materials has mined for decades. The large pyramid steps, left, in the face of the mountain would be prohibited under the new proposal.

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