(a.k.a. carrots): tubes of ice extracted from under the surface with an ice drill. Ice cores are drilled with a diameter of about 15cm and extracted in sections of 1 to 3 meters depending on the conditions drill type and the ice fragility. The oldest ice in the world was extracted from a 3270 meters deep hole in Dome C by the Epica project on december 21st 2004: it's about 950 thousand years old and currently being studied in details.

A cylinder-shaped piece of ice, usually cut by a drill.

a cylinder of Ice removed from an ice sheet

Volcanic Winter