Speleothems - Frostwork
Delicate needle-like growths of calcite or a related mineral, aragonite, are called frostwork. In places the frostwork may grow on top of cave popcorn or boxwork. The origin of frostwork is controversial. In Wind Cave, it seems to concentrate in passages with above average airflow where, it is thought, evaporation plays a role in its formation.
Did You Know?
Elk were the most widely distributed member of the deer family in North America and spread from the Atlantic to the Pacific, from Mexico to northern Alberta. Elk began to disappear in the eastern United States in the early 1800s. More...