[wyattearp]

Have they drilled into a 70K old glacier in the arctic that I haven't heard about?

Apparently:

"Two projects conducted from 1989 to 1993 collected parallel ice cores just 30 kilometers apart from the central part of the Greenland ice sheet. Each core is more than 3 kilometers deep and extends back 110,000 years."

( Earth in Space, Vol. 9, No. 2, October 1996, pp. 12-13. © 1996 American Geophysical Union.)

[Mamzelle]

Did they look on the expiration date to come up with that number?

[Elsie]

The ability to count annual layers in the cores well into the glacial period and probably through 110,000 years will help to answer questions about the timing of the glacial periods and the usefulness of radiocarbon calibrations.

Ok.....