Abstract

The transitional area between the Colorado Plateau and Basin-Range province near Zion National Park has been remapped. Within this area, the Kanarra anticline and Hurricane fault have been variously interpreted by previous workers. The writer emphasizes that the anticline was formed, locally overturned to the east, and cut by the Taylor Creek thrust during Laramide time. Structural evidence and local absence of stratigraphic units indicate relief of the Laramide structures may have exceeded 10,000 feet. The Hurricane zone of normal faults developed parallel to the anticline in late Cenozoic time, with a relative uplift on the Plateau side, totaling about 4000 feet.

Erosion, consequently, has removed a thickness, probably exceeding 13,000 feet, of Mesozoic and Cenozoic rocks from the Plateau margin. It is still reducing the scarps of the Hurricane fault zone; the more ancient Laramide structures are exposed in canyons carved by erosion through the fault blocks.

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