Sorry, don't see it.
This, however, is easy to GROK :
Younger Dryas Impact Astrobleme Remnant
and it much better explains the Younger Dryas Flood down the St. Lawrence and the Marquette readvance across Lake Superior.
Space/Science » in reply to Possible Holocene Start impact crater
This, however, is easy to GROK :
Younger Dryas Impact Astrobleme Remnant
and it much better explains the Younger Dryas Flood down the St. Lawrence and the Marquette readvance across Lake Superior.