Album: Paleofill and Breccia

Jewel Cave National Monument

Examples of Paleofill and Breccia in Jewel Cave. While the cave was forming, some voids were filled in with other material known as paleofill, including dolomite and sandstone. Paleofill in Jewel Cave often contains iron, giving it a distinctive red color. Breccia is a rock containing angular fragments of other rocks, which have been cemented back together.