PENNY ICE CAP CORES, BAFFIN-ISLAND, CANADA, AND THE WISCONSINAN FORE DOME CONNECTION - 2 STATES OF HUDSON-BAY ICE COVER

Ice cores from Penny Ice Cap, Baffin Island, Canada, provide continuou s Holocene records of oxygen isotopic composition (delta(18)O, proxy f or temperature) and atmospheric impurities. A time scale was establish ed with the use of altered seasonal variations, some volcanic horizons , and the age for the end of the Wisconsin ice age determined from the GRIP and GISP2 ice cores. There is pre-Holocene ice near the bed. The change in delta(18)O since the last glacial maximum (LGM) is at least 12.5 per mil, compared with an expected value of 7 per mil, suggestin g that LGM ice originated at the much higher elevations of the then ex isting Fore Dome and Fore Ridge of the Laurentide Ice Sheet. The LGM d elta(18)O values suggest thick ice frozen to the bed of Hudson Bay.