Limestone Buildings: Why Are They So Popular in the Texas Hill Country?

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Check out many of the courthouses, churches, and city buildings throughout Texas Hill Country towns. Typically, the buildings appear bright white, but they aren’t painted to look that way. Limestone buildings are a common sight in this area. But, why limestone? Why not granite, like the capitol building in Austin? Find out why limestone buildings are so popular throughout the Texas Hill Country.

A Common Material

Limestone buildings such as this house are common throughout the Texas Hill Country

Photo: Wikimedia Commons

Drive along almost any of the roads in the Texas Hill Country and look for places where the road cut into the native rock. You’ll likely see pale white stone looking out from these cut areas. This limestone is prevalent throughout the Hill Country. One of the main reasons Texans opted for limestone buildings was simply because that was the material at hand. It seems almost every county has a limestone quarry that either is currently active or once was in the past. These numerous local quarries could supply the building materials for nearby towns without incurring the cost of using foreign stone.

Caliche Sometimes Confused for Limestone

Caliche resembles limestone because both have calcium in them

Photo: Wikimedia Commons

Caliche is another bright white material used in buildings in the Texas Hill Country. You’ve likely seen other constructions with this material before as it’s used in Portland cement and in the pyramids at Giza. Caliche has calcium carbonate in it, which means its composition is like limestone. Unlike certain limestones, you won’t see fossils in caliche.

Differences Between Caliche and Limestone

Heidgen House is made of both limestone and caliche

Photo: Wikimedia Commons

The two differ in their formations. When rain falls, it contains small amounts of calcium carbonate, and if the region is dry, the water evaporates, leaving the calcium behind. After some time of this, the soil appears white from so much calcium carbonate. Over thousands of years, this caliche deposit builds up, and pressure from the overlying rock compresses the caliche into a rock layer, which may be used for construction. Limestone, however, is formed from sediments at the bottom of the inland sea that existed millions of years ago. The calcium-containing shells of tiny sea creatures on the seafloor were compressed together over time, creating the limestone. Occasionally, the seashells and sea creature bodies did not become compressed but formed indentations in the limestone, resulting in fossil imprints. Look for these on some limestone buildings around Texas.

A Limestone Capitol?

Austin's capitol was almost built of limestone
Photo: Wikimedia Commons

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