[2] On December 15, 2009, the two agencies agreed to buy 1,644 acres (665 hectares) of property adjacent to the Vasco Caves.

The new Vaquero Farms tract will not be open for public access but will be held in land bank status because of sensitive wildlife habitat and ongoing wind turbine operations.

On top of the rocks, there are vernal pools that are habitats for the long-horned fairy shrimp (Anostraca).

[6] Between 700 BC and AD 300, these caves and the nearby area was an Ohlone village called Chitactac.

[citation needed] The preserve is not open to casual visits by the public, with access limited to guided tours only via reservation.