Hiawatha Crater and Greenland ice core evidence for Younger Dryas impact. 31-kilometer-diameter impact crater detected beneath Hiawatha Glacier in Greenland using ice-penetrating radar Argon dating suggested 55 million years, but Thackeray argues this is inconsistent with fresh crater rim and no ice older than 12,800 years at the site Pettke et al. 2013 paper identified platinum peak (PPP) in Greenland ice core close to Younger Dryas onset
Beneath Greenland's Hiawatha Glacier lies a 31-km impact crater detected by ice-penetrating radar. Thackeray argues its fresh appearance contradicts the 58-million-year argon dating. Pettke et al. 2013 found a platinum peak near Younger Dryas onset (~12,800 years ago), unlike the deformed Chesapeake Bay crater (35 million years old).
Key Facts
- 31-kilometer-diameter impact crater detected beneath Hiawatha Glacier in Greenland using ice-penetrating radar
- Argon dating suggested 55 million years, but Thackeray argues this is inconsistent with fresh crater rim and no ice older than 12,800 years at the site
- Pettke et al. 2013 paper identified platinum peak (PPP) in Greenland ice core close to Younger Dryas onset
- Onset of Younger Dryas cooling (OYD) is globally recognized at approximately 12,800 years ago
- Chesapeake Bay impact crater (35 million years old) is used as comparison, being 60-70% as old but completely deformed while Hiawatha appears fresh
Source: The Younger Dryas Impact Evidence Has Reached Africa by The Cosmic Summit