Arctic speleothem
Detailed Description
A cross-section of an Arctic speleothem showing growth layers of calcite deposited over hundreds of thousands of years. This speleothem only grew during intervals of past permafrost thaw (i.e., interglacials), when drip water could percolate into the cave through the unfrozen epikarst.
Sources/Usage
Public Domain.
Photo taken by Alena Giesche, USGS