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Units Tls and Tmc (Tertiary rocks of Loma Chiquita Ridge and Mount Chuar) belong to the Sierra Azul block; the surrounding serpentinite (Jsp) and melange (fm) and basaltic lava (fpv) are much older and belong to the New Almaden block (lower left). Units marked "Q" are sediments.

Units Tls and Tmc (Tertiary rocks of Loma Chiquita Ridge and Mount Chuar) belong to the Sierra Azul block; the surrounding serpentinite (Jsp) and melange (fm) and basaltic lava (fpv) are much older and belong to the New Almaden block (lower left). Units marked “Q” are sediments.

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