I thought the last ice age ended about 10-13 k years ago and was about 60-80 k years long? This story doesn’t add up.
There was a sudden resurgence of cold conditions about 13,000 years ago. Geologists refer to this period as the “Younger Dryas”. Some people have theorized that a glacial ice dam, holding back glacial Lake Agassiz, burst, and an enormous quantity of cold fresh water was released into the North Atlantic, via Hudson’s Bay, thus radically changing the ocean currents and plunging the earth back into an ice age.
You’re correct. The last ice age was melting down around 13,000 years ago and then the Younger Dryas ‘occured’. A new theory, with strong supporting evidence suggests an asteroid or comet impact in the Eastern Canadian ice sheet caused the Younger Dryas, the mass extintions of large animals in North America and the end of the Clovis culture. The animals had survived many ice ages before so renewed glaciation would not have posed a threat. Their abrubt extinction at the same time as the Clovis people as well as the rapid return of glaciation point to catastrophism.