by: Charles O’Dale
*In my articles I use the term “crater“ to define a circular impact depression and the term“structure“ to define an impact crater that is severely altered by erosion.
- Improbable: observations of the structure and/or geological context suggest a non-impact origin but alternative interpretation has not been well established.
| 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 | No “crater” depth indication | 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 Structure | ~0.65 | 0.80 to 0.130 | After Florida Plateau deposition | Solutional Doline | 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? |
