Ridge Keel : The portion of an ice ridge that extends below the water line. Can be partially consolidated in first-year ridges but the depth of consolidation is variable. (Bul 2N)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}