Did the Yucatan asteroid break into pieces and vault North America and gouge out the Great Lakes? The ice age is insufficient to make them.
Alaska looks like 3 fingers of dirt. Ireland also looks like 3 fingers of dirt. The Yucatan asteroid 65 million years ago hit when Africa and South America were sitting together. It started the present day continental drift. Ireland and Alaska were splashed by alot of mud and the asteroid must have been rotating counter clockwise because Alaska is the larger mud throw. Ireland turned around after breaking away from England. The puzzle pieces are clear. No other lakes are splayed out across from a giant asteroid hit.
Although the evidence indicates that the Yucatan Asteroid smashed into Central America 65 million years ago at an oblique angle and incinerated life in North America (and the resulting fallout altered weather conditions that did in the majority of the dinosaurs, along with other species) there's scant evidence that it was responsible also for the geography of Ireland, Alaska, and the Great Lakes.
When the Cretaceous Period began 65 million years ago, Africa and South America had already separated; the movement of continental plates was already in play. However, you raise an interesting speculation if the impact accelerated or altered the motion of the plates! Interestingly, the general question of how meteors or asteroids have (or haven't) altered the land masses should be explored through more research.