The Presidio Trust archaeology program explores what’s beneath it all…the extraordinary historical record just under our feet. The Presidio Trust manages over 30 archaeological areas within the Presidio National Historic Landmark District (NHLD). These archaeological areas offer a long-term history from Native Ohlone settlement hundreds of years ago through the occupation of the United States Army. 

The Presidio Archaeology Lab’s primary research focus is the site of El Presidio de San Francisco the original Spanish Colonial fort occupied by the Spanish and Mexicans from 1776-1846. Archaeological investigations take place on Pershing Square, located on the Main Post and are situated within what archaeologists believe was the western portion of the circa 1815 Spanish-colonial El Presidio quadrangle.

Archaeological excavation in this area started in early May 2014 and has revealed archaeological deposits with artifacts and features dating to the Spanish, Mexican, and American occupations of the area. Investigations will be ongoing for the next several years. We use an open-site approach, inviting park visitors to witness archaeological research in acti​on.​

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