Peñón del Marqués, Mexico City.

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An Irregular urban expansion around a fragile volcanic edifice, Peñón del Marqués or Peñón Viejo, Mexico City. This was the place where the fleet of Hernando Cortés faced a large number of Mexica canoes. During the Mexican-American War, the Mexican army expected to fight he American forces at this point, but the American generals decided to attack Mexico City following a route open through the volcanic fields of the southern Basin of Mexico. More intriguing is that the tectonic fault that created this volcano and at least three rockslides of its edifice might have caused recurrent tsunami waves in Lake Texcoco. The last tsunami event perhaps took place at the eve of the Spanish Conquest of Tenochtitlan. Dr. Gerardo Gutierrez CU Boulder