by: Charles O’Dale

*In my articles I use the term crater to define a circular impact depression and the termstructure to define an impact crater that is severely altered by erosion.

Name Diameter (km) Age (million years) Dating method Morphological type Notes
Carolina Bays, NC Various ~0.0129-0.14 Not firmly quantified  Simple Younger Drias black mat
Charity Shoal, Lake Ontario ~1  ? Simple underwater Lake Ontario Negative magnetic anomaly
Charron Lake, Manitoba >4.5  ?  Simple Negative magnetic anomaly
Corossol Structure, Gulf of St. Lawrence 4.0 ~0.012 14C age shells in sediments Complex Underwater Gulf St. Lawrence
Franktown structure, Ontario ~2 >400 Ordovician sediment cover  Simple Circular depression
Kakiattukallak Lake, Quebec 3 – 6  ?  Simple Possible Multiple Impact?
Lac de Courval, Quebec ~1.6  ?  Simple Circular lake
Lac du Bonnet, Manitoba ~3.8  75 Sedimentary cover depth  Simple Circular magnetic anomaly
Merewether, Labrador 0.19812 (largest of three) 0.00087? Sediment depth  Simple Possible methane explosion
Victoria Island, California 5.5 37-49 Drilling data  Simple Geological dating


“We, all of us, are what happens when a primordial mixture of hydrogen and helium evolves for so long that it begins to ask where it came from.”
Jill Tarter