Structure of Sierra Pilares, municipio de Ojinaga, Chihuahua, Mexico
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The map of the Sierra Pilares of the Chihuahua tectonic belt shows an asymmetric north-trending anticlinal fold of Laramide origin that owes most of its relief to Tertiary basin and range block faulting. This has been named the Borrachera anticline. A large thrust sheet is exposed along the southern boundary of the map area; overthrusting from west to east towards the Diablo Platform fits the regional pattern of thrusting. Tertiary block faulting produced numerous normal faults trending subparallel to the fold axis. A study of 49 joint trends in the Hawkeye limestone in the Borrachera anticline indicates that the maximum compressive stress orientation was east-west. Some joints were formed before the folding, others during the early stages of the folding episode. Petroleum production is possible from the Borrachera anticline; large supplies of underground water are available from bolson fill; metal production is unlikely.