Historic Discovery Connects San Antonio Zoo to Iconic Alamo Limestone
SAN ANTONIO, TX – Thursday, March 6, 2025 – In a remarkable historical breakthrough coinciding with the 189th anniversary of the Battle of the Alamo, researchers confirmed a direct connection between the famed Alamo and the San Antonio Zoo, revealing the precise quarry that provided the mission’s original limestone.
The Alamo, Texas’s most iconic landmark and symbol of state pride and independence, is currently undergoing a meticulous restoration in honor of the anniversary commemorating the historic 1836 battle. This restoration process gained unexpected assistance thanks to a remarkable find uncovered at the San Antonio Zoo.
During excavation work for the Zoo’s new gorilla habitat, Congo Falls, and adjoining event center, The Ralston, construction crews uncovered large deposits of limestone. Recognizing the historical potential, the Zoo enlisted Highbridge Materials Consulting, Inc., to investigate further.
In an exclusive feature aired Thursday morning on ABC’s “Good Morning America,” Alamo conservator Pamela Rosser walked correspondent Matt Rivers through the significance of this discovery. “This limestone represents a direct connection to our past,” said Rosser, highlighting the importance of authentic restoration materials.
After extensive geological testing and historical cross-referencing, Highbridge Materials Consulting, Inc. confirmed that the limestone excavated at the Zoo site matched perfectly with the stone used in the original Alamo Church construction. Located on the far west side of the Zoo, this quarry now officially recognized as a primary source of limestone used in the 1700s, finally solves a centuries-old historical mystery.
Kolby Lanham, the Alamo’s senior researcher and historian, emphasized the profound significance of this discovery. “The Alamo battle is part of the fabric of who we are as Texans,” Lanham remarked. “Understanding the very materials that built this iconic site helps us preserve and honor its legacy.”
This discovery is especially timely, occurring amid the ongoing $550 million redevelopment project at the Alamo, set for completion in 2027. The redevelopment includes a state-of-the-art Visitor Center & Museum dedicated to telling the complete 300-year history of the site and featuring new research insights such as this extraordinary limestone revelation.
With this newfound clarity, San Antonio residents and visitors alike can enjoy an enriched appreciation of their historical surroundings, knowing that the city’s storied past and its bustling present are literally built from the same foundational stone.
