Municipality and town
|State||San Luis Potosí|
|Time zone||UTC-6 (Central Standard Time)|
|• Summer (DST)||UTC-5 (Central Daylight Time)|
The area was the birthplace, on May 14, 1901 of the petroleum industry in Mexico, with the first strike made by a company owned by Edward L. Doheny, assisted by geologist Ezequiel Ordóñez of the Mexican Central Railway.  In 1914, in the events of the Mexican Revolution I came up with the battle of Ébano
- "-". Enciclopedia de los Municipios de México. Instituto Nacional para el Federalismo y el Desarrollo Municipal. Archived from the original on January 28, 2007. Retrieved January 11, 2010.
- George Grayson, The Politics of Mexican Oil (University of Pittsburgh Press, 1981) p6
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