Ground ice

From Glossary of Meteorology

ground ice

(Also called subsoil ice, subterranean ice, underground ice, stone ice.) A body of clear ice in frozen ground.

Ice of this nature is most commonly found in more or less permanently frozen ground (permafrost) and may be of sufficient age to be termed fossil ice.
Compare frost mound, icing.

Muller, S. W. 1947. Permafrost, or Permanently Frozen Ground, and Related Engineering Problems. p. 217.

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