Even in their dark isolation from the atmosphere above, caves can hold a rich archive of local climate conditions and how they’ve shifted over the eons. Formed over tens of thousands of years, speleothems—rock formations unique to caves better known as stalagmites and stalactites—hold secrets to the ancient environments from which they formed.
Click here for original story, Wisconsin cave holds tantalizing clues to ancient climate changes, future shifts
Source: Phys.org