The Underworld of Oregon Caves National Monument

The booklet explains how layers of soluble rock deposited in ancient seas were later exposed and sculpted by flowing water to form caverns and a variety of speleothems—stalactites, stalagmites, columns, draperies, rimstone pools, and other decorations. It presents the cave’s geologic history and age, describes underground erosional processes and notable physical features, and surveys the limited plant and animal life found there. It also reviews early human exploration, outlines conservation and management practices, and offers practical guidance for visitors, supported by a glossary and suggested readings for further study.