Tilted sedimentary strata of the Madera Formation (middle Pennsylvanian) are capped by early Proterozoic crystalline rocks (*). Rocks of the Madera Formation are contorted and brecciated in the fault zone, which marks the Culebra Thrust Fault. View from Trinchera Peak looking westward, Sangre de Cristo Mountains, southern Colorado, United States. Photo © J.S. Aber.
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