Impact 13K. 

Antonio Zamora illustrates Inverted Stratigraphy in the kitchen. 
Further evidence of model tying formation of Carolina Bays to single event ~13k years ago. 

The Great Ripple. 
Shockwave from impact zone in Michigan traveled terrestrially while chunks of Laurentian ice sheet hurtled to the Carolinas (and Nebraska).

These liquefaction-prone zones bear the scars of the ejectites impacting as the Great Ripple passed through. Perhaps 4-7 minutes after impact.. 

Imagine the steam generated from ablation of the enormous ice chunks..