Greenland Ice-core Project/Greenland Ice Sheet Project 2 (GRIP/GISP2) ice cores preserve climate records extending back more than 100,000 years.
Notes on verification
Multiple independent peer-reviewed studies and agency (NOAA, NSF) archives corroborate GRIP/GISP2 ice cores span ~100,000-110,000+ years, consistent with the claim.
Sources
- Greenland Ice-core Project/Greenland Ice Sheet Project 2 | geochronology | Britannica (britannica.com)
- https://user-web.icecube.wisc.edu/~dbesson/tem/aCD/DOCUMENT/GISPINFO.HTM (user-web.icecube.wisc.edu)
- https://icecores.org/inventory/gisp2 (icecores.org)
- https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=noaa-icecore-17796 (ncei.noaa.gov)
- https://climatechange.umaine.edu/gisp2/contribseries/full/03.html (climatechange.umaine.edu)