subglacial.

= englacial, adj.; also, lying upon or within, or being, the terrain formerly occupied by a glacier or ice-sheet.

Geol. Applied to a zone characterized by anamorphism (see anamorphism, n. 3).

Characteristic of or designating an area where the influence of an adjacent ice sheet or glacier, or the action of freezing and thawing, is or…

Designating or relating to a period or condition in which crustal deformation predominates over erosion and sedimentation, leading to an overall…

Characterized by an overall lessening of relief as a result of erosion predominating over crustal upheaval.

Of, pertaining to, or designating a region of Tertiary volcanic activity including Iceland and parts of Britain and Greenland.

Of, relating to, or formed by buried relief features; = palaeogeomorphological, adj.