San Antonio Zoo discovers limestone used to build Alamo while excavating new gorilla habitat

Highbridge Materials Consulting, Inc., tested the limestone and verified the quarry, located on the far west side of the San Antonio Zoo, was the primary source of the stone used in the 1700s to build the Alamo Church and other historic structures in the city. Matt Rivers, a former KSAT 12 News reporter and now ABC News correspondent, joined KSAT's News at 5 for the details.