Permafrost 8 : Soil with partially or completely frozen pore water. (Permafrost is sometimes defined as soil at a temperature below 0oC. Permafrost will be used only to indicate ice bonded soil. (Bul 2N)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}