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Located within Longhorn Cavern State Park, Longhorn Cavern was formed in limestone of Ordovician Age at least 450 million years old. Unsurpassed as a natural exhibit of features such as calcite crystals, potholes, solution domes, channels and pits, the cave is an outstanding example of features formed during the phreatic (groundwater) phase of development.
Location: Burnet County, TX
Year designated: 1971
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Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012