The Younger Dryas makes this interglacial quite distinctive and is responsible for the extinction of most Pleistocene megafauna like the mammoths. I remember reading about core samples from an Irish lake that showed the temperature fell from almost as warm as now to full ice age over the course of a summer. This killed the distinctive grasslands the megafauna relied on faster than the grasslands could move south.
Meteor strike in Northern Canada...................