pressure ridge

a ridge produced on floating ice by buckling or crushing under lateral pressure of wind or ice.

Geology. a ridge produced on a congealing lava flow by pressure from the still-liquid interior.

Origin of pressure ridge

First recorded in 1895–1900

I should not like to have that pressure-ridge come in right under the nose of the Fram, as it might soon do some damage.

Farthest North |Fridtjof Nansen
The pressure-ridge was an ugly sight, they say, but they could distinguish nothing well in the dark.

Farthest North |Fridtjof Nansen
It was constructed on the pressure-ridge where the boats and part of the stores from the great hummock had been placed.

Farthest North |Fridtjof Nansen
We first hollowed out a cavity of sufficient size in the pressure-ridge, and then roofed it over with blocks of ice and snow.

Farthest North |Fridtjof Nansen

A movement began in the pack, and a pressure-ridge started directly for the ship.

The Romance of Polar Exploration |G. Firth Scott