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
Eclipse Lake, Labrador small ~1.5  ? Simple – Possible flat-floored Two possible structures
Eclipse Lake, Labrador large ~6  ? Complex  Two possible structures
Howell Creek, BC ~10 90-97 Between syenites and Cardium sands  Simple Circular geologic formation
Hudson Bay Arc >450 <4,600  Arc rock age  Multi ring basin? No impact metamorphism found
Jocko, Ontario >0.2 <0.012 Created in glacial remains Simple Ground Exploration Video
Lac La Moinerie (north), Quebec 1.8  ?  Simple Circular structure
Merewether, Labrador 0.19812 (largest of three) 0.00087? Sediment depth  Simple Possible methane explosion
Miami Florida Crater/Structure ~1 ~140 After Florida Plateau deposition Complex? Underwater off Miami
Parry Peninsula, NWT 160 <65 K/T boundary timeframe Complex
Plevna/Tomvale Structure, ONTARIO ~0.01 <12,000 Years Created in glacial remains Simple
Touchwood Hills, Saskatchewan >200 >541 Post Williston Basin deposit  Multi-ring Basin?


“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