Paleo Slide Set: Polar Ice Cores
Extruding a core

Scientists extrude the core from its barrel with the utmost care. Any butyl 
acetate on the core surface is carefully cleaned off before sawing the ice 
into 2 m sections. The cloudy layers clearly visible in this 6 m core section 
were formed when dust fell onto the ice sheet and was entrained in the ice. 

Photo Credits:
Mark Twickler 
University of New Hampshire