Two million year old glacial potholes found in central China

A cluster of glacial potholes dating back two million years can be seen in this aerial photo of Shennonggu National Forest Park in Anren County in central China's Hunan Province on June 19, 2018. The potholes were caused by erosion caused by glaciers in the Quaternary Period. This rare landform makes it an important site for geological research. [Photo: IC]