Carlsbad Caverns National Park

Lore & Background

Marine life remains formed a reef, which after the Permian Period was buried by evaporites and sediments. Tectonic movement during the late Cenozoic uplifted the reef, and erosion sculpted the Guadalupe Mountains. The caverns formed when hydrogen sulfide from deep petroleum reserves seeped into groundwater, creating sulfuric acid that dissolved the limestone. Gypsum within the cave confirms this process. After acidic groundwater drained, speleothems such as stalactites and stalagmites began to form from calcium carbonate deposits.

Reader's Guide

Carlsbad Caverns National Park is significant for its geological history and preservation. The park's caverns were formed by a rare sulfuric acid dissolution process, not typical carbonic acid erosion. The Big Room is the largest chamber in North America and the 32nd largest in the world. The park includes two historic districts on the National Register of Historic Places: the Caverns Historic District and the Rattlesnake Springs Historic District. Approximately two-thirds of the park is designated wilderness, ensuring minimal future habitat changes. The park's accessibility—via a natural entrance or elevator—makes it a globally notable cave complex.

Did You Know?

• The Big Room is the largest chamber in North America and the 32nd largest in the world.
• The caverns were formed by sulfuric acid dissolving limestone, not by carbonic acid.
• The park's natural entrance was created by erosion above ground within the last million years.
• The town of Carlsbad is named after the Czech town formerly known as Karlsbad, meaning 'Charles' Baths'.