MY AMATEUR ADVENTURES IN CRATER EXPLORATION

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.
 

Name Diameter (km) Age (megayears) Dating method Morphological type Notes
Barringer, Arizona 1.19 0.049 ± 0.003 Radioactive decay CONFIRMED Simple1 Jointed
Beaverhead, Montana/Idaho ~100 ~600 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Peak ring1 Allochthonous
Bloody Creek, Nova Scotia 0.350 X 0.420 ~0.012 Geological dating PROBABLE Simple1  Elliptical basin
Bow City, Alberta 6 <75 Geological dating PROBABLE Complex  No surface expression
Brent, Ontario 3.8 396 ± 20 K-Ar studies on the coarsely crystalline melt rocks CONFIRMED Simple1 Overflight of Brent Crater
Can-Am, Lake Huron 100 ~500 Geological dating PROBABLE Complex Underwater in Lake Huron
Carolina Bays, NC Various ~0.0129-0.14 Not firmly quantified POSSIBLE Simple1 Younger Drias black mat
Carswell, Alberta 39 115 ± 10 40Ar/39Ar Peak ring1 Multi-ring impact?
Charity Shoal, Lake Ontario ~1  ? POSSIBLE Simple1 underwater Lake Ontario Negative magnetic anomaly
Charlevoix, Quebec 54 342 ± 15 K-Ar CONFIRMED Peak ring1 Elevated Earthquake Zone
Charron Lake, Manitoba >4.5  ? POSSIBLE Simple1 Negative magnetic anomaly
Chicxulub, Yucatan, Mexico 150 66.043 ±0.011 40Ar/39Ar CONFIRMED Peak ring basin5 Cretaceous-Paleogene
Clearwater East, Quebec 26 ~460–470 Rb-Sr melt rocks CONFIRMED Complex1 Chondrite-type
Clearwater West, Quebec 32 290 ± 20 K-Ar melt rocks CONFIRMED Peak ring1
Cloud Creek, Wyoming 7 ~190 +/- 30 Ma Geological dating CONFIRMED Complex2 Chronostratigraphic
Corossol Structure, Gulf of St. Lawrence 4.0 ~0.012 14C age shells in sediments POSSIBLE Complex Underwater Gulf St. Lawrence
Decaturville Structure, Missouri 5.5 260-323 Geological dating CONFIRMED Complex2
Deep Bay, Saskatchewan 9.5 99 ± 4 Geological dating CONFIRMED Simple Flat-floored1 Cretaceous sediments
Des Plaines, Illinois 8 <280 Geological dating CONFIRMED Complex2
Dumas, Saskatchewan 4 <70 Geological dating PROBABLE Simple1 Seismic and borehole data
Eagle Butte, Alberta 10 <65 Geological dating CONFIRMED Complex2 Shatter-coned Cretaceous rocks
Eclipse Lake, Labrador small ~1.5  ? IMPROBABLE Simple1 – Possible flat-floored Two possible structures
Eclipse Lake, Labrador large ~6  ? IMPROBABLE Complex  Two possible structures
Elbow, Alberta 8 395 ± 25 Geological dating CONFIRMED Complex2 Brecciated Devonian strata
Franktown structure, Ontario ~2 >400 Ordovician sediment cover POSSIBLE Simple1 Circular depression
Glover Bluff, Wisconsin 8 <500 Geological dating CONFIRMED Complex2
Gow, Saskatchewan 5 <250 Radioactive decay CONFIRMED Complex 2 Smallest currently known complex
Hartney, Manitoba 6 <190 ± 20 Geological dating PROBABLE Complex? Structurally uplifted centre
High Rock Lake, Manitoba ~5 435 ± 10 Geological dating PROBABLE Complex
Holleford, Ontario 2.35 550 ±100 Geological dating CONFIRMED Simple1 Overflight of Holleford Crater
Howell Creek, BC 90-97 90-97 Between syenites and Cardium sands IMPROBABLE Simple1 Circular geologic formation
Hudson Bay Arc >450  ? IMPROBABLE Multi ring basin? No impact metamorphism found
Ile Rouleau, Quebec 4 <300 Geological dating CONFIRMED Complex3 Age based on stratigraphy
James River, Alberta 4.8 <480 Geological dating PROBABLE Complex No surface expression
Jocko, Ontario >0.2 <0.012 Created in glacial remains IMPROBABLE Simple1 Ground Exploration Video
Kakiattukallak Lake, Quebec 3 – 6  ? POSSIBLE Simple1 Possible Multiple Impact?
Lac Couture, Quebec 8 425 ± 25 Ar40-Ar39 melt rock CONFIRMED Complex1 Submerged central peak
Lac de Courval, Quebec ~1.6  ? POSSIBLE Simple1 Circular lake
Lac du Bonnet, Manitoba ~3.8  75 Sedimentary cover depth POSSIBLE Simple1 Circular magnetic anomaly
Lac La Moinerie, Quebec 8 400 ± 50 Ar40-Ar39 melt rock CONFIRMED Complex1
Lac La Moinerie (north), Quebec 1.8  ? IMPROBABLE Simple1 Circular structure
Manicouagan, Quebec 100 214 ± 1 Radioactive decay CONFIRMED Peak ring basin5 Zircon/melt rock dating
Manson, Iowa ~35 73.8 Ar40-Ar39 melt rock CONFIRMED Central peak1 No surface evidence
Maple Creek, Saskatchewan 6 <75 Geological & radioactive decay dating CONFIRMED Complex5 Disrupts Late Cretaceous rocks
Merewether, Labrador 0.19812 (largest of three) 0.00087? Sediment depth POSSIBLE Simple1 Possible methane explosion
Miami Florida Crater/Structure ~1 ~140 After Florida Plateau deposition IMPROBABLE Complex? Underwater off Miami
Mistastin, Labrador 28 36.6 ± 2 Ar40-Ar39 melt rock CONFIRMED Central peak basin6 Maskelynite
Montagnais, off Nova Scotia 45 50.5 ± 0.76 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex1 Submerged south of Nova Scotia, Canada
Newporte, North Dakota 3.2 <500 Geological biostratigraphic dating CONFIRMED Simple2 No surface evidence
Nicholson Lake, North West Territories 12.5 389 ± 6.7 Pb/U CONFIRMED Complex1 The large island within the lake is the eroded central peak
Panther Mountain, New York state 10 ~375 Geological dating PROBABLE Complex Inverted relief
Parry Peninsula, NWT 160 <65 Post Cretaceous IMPROBABLE Complex
Pilot Lake, North West Territories 6 445 ± 2 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex2 Dating based on one sample
Pingualuit, Quebec 3.44 1.4 ± 0.1 Ar40-Ar39 melt rock CONFIRMED Simple1 Overflight of Pingualuit Crater
Plevna/Tomvale Structure, ONTARIO ~0.01 <12,000 Years Created in glacial remains IMPROBABLE Simple1
Presqu’ile, Quebec 24 <500 Geological dating CONFIRMED Complex1 High level erosion
Purple Springs, Alberta 6 <75 Geological dating PROBABLE Complex  No surface expression
Red Wing, North Dakota 9.1 200 ± 25 Geological dating CONFIRMED Complex?8 Stratigraphy
Rock Elm, Wisconsin 6 420–440 Geological dating CONFIRMED Complex7 Youngest exposed rocks
Skeleton Lake, Ontario 3.5 ~800 Geological dating PROBABLE Simple1
Slate Islands, Lake Superior 32 436 Ma ± 3 Ar40-Ar39 melt rock CONFIRMED Complex1 Pseudotachylite dating
St. Martin, Manitoba ~40 227.8 ±0.9 Ar40-Ar39 melt rock CONFIRMED Complex1 Dauphin River diversion?
Sudbury, Ontario 250 1852 +4/-3 U-Pb zircon CONFIRMED Multi ring?1 Sudbury Distal Ejecta
Touchwood Hills, Saskatchewan >200 >541 Post Williston Basin deposit IMPROBABLE Multi-ring Basin?
Upheaval Dome, Utah 5.5 <170 Geological dating CONFIRMED Complex4 Younger than the Jurassic Navajo Sandstone
Victoria Island, California 5.5 37-49 Drilling data POSSIBLE Simple1 Geological dating
Viewfield, Saskatchewan 2.5 190 ± 20 Geological dating CONFIRMED Simple2 Jurassic-Triasic post-impact deposit
Wanapitei, Ontario 3 to 7.5 37.2 ± 1.2 K/Ar, Ar40-Ar39 melt rock CONFIRMED Simple1 – Possible flat-floored?1 L or LL chondrite projectile
West Hawk, Manitoba 2.44 100 Geological dating CONFIRMED Simple11 No reliable age
Whitecourt, Alberta 0.036 0.00113 14C dating of charcoal CONFIRMED Simple1 Medium octahedrite (Om) IIIAB

 

1 Dence, Michael R. Structural evidence from shock metamorphism in simple and complex impact craters: Linking observations to theory. Meteoritics & Planetary Science 39. Nr 2, 267-286 (2004).

2 Grieve R.A.F., Impact structures in Canada, Geological Association of Canada, 2006.

3 Spray J.G. et al. A marine magnetic study of the Ile Rouleau impact structure, Lake Mistassini, Quebec Canada. Meteoritics, 70th Annual Meeting (2007).

4 Eugene M. Shoemaker, Bryan J. Kriens, Ken E. Herkenhop, GEOLOGY OF THE UPHEAVAL DOME IMPACT STRUCTURE, SOUTHEAST UTAH. Journal of Geophysical Research–Planets, April 16, 1998.

5 Grieve R.A.F. and Head J.W. The Manicouagan impact structure: An analysis of its original dimensions and form. Journal of Geophysical Research 88:A807-A818 (1983).

6 French, B.M. Traces of Catastrophe, Lunar and Planetary Institute, 1998

7 Cordua, W. S., “The Rock Elm Structure, Pierce County, Wisconsin, a possible cryptoexplosion structure”, Geology, vol. 13, p. 372-374. 1985.

8Donofrio, Richard R., IMPACT CRATERS: IMPLICATIONS FOR BASEMENT HYDROCARBON PRODUCTION. Journal of Petroleum Geology, 3, 3, pp. 279-302, 1981.

 

NON-IMPACT GEOLOGICAL FEATURES

During my aerial meteorite crater explorations over various points of the North American Continent, I have noticed and documented a few geological features that are suspiciously shaped like meteorite craters. Also, I have investigated a few that were suggested by people who have contacted me after reading my crater articles. I have listed below the “crater like” structures that I have documented and could be confirmed as impact related if in the future evidence is found. I will be periodically adding more features as I visit them. If you have any additional information on any of the structures that I have documented or any new possible meteorite craters, please let me know.

 

Name Diameter KM Morphology Notes
Alsever Lake, Ontario ~4 Circular Formation Brent analog
Brackett Lake, NWT 8.67 Circular Formation
Canoe Lake area, Ontario 0.150 Circular Formation
Colter, Oklahoma, USA 0.150 Circular Formation
Hanson Lake, Saskatchewan 0.550 Circular Formation
La Loche, Saskatchewan 0.150 Circular Formation
North of Lake Superior, Ontario <0.050 Circular Formation
Otter Lake, Quebec <0.050 Circular Formation
Prince Edward Point, Ontario 0.400 Circular Formation
Quorn Lake, Ontario 1.73 Circular Formation
Riding Mountains, Manitoba 1.73 Circular Formation
South of Great Bear Lake, NWT 0.240 Circular Formation
Callander Bay – Ontaro 4 Syenite/Pluton  ~577 ma geological
Croker Island Complex, Ontario 10 Syenite/Pluton 1510 ±50 ma  – Rb-Sr
Lake Skootamatta, Ontario Presqu’ile analog ~5.5 Syenite/Pluton
Manitou Islands Complex, Ontario 4 Syenite/Pluton ~577  ma geological
Mount Moriah Structure – Ontaro ~5.5 Syenite/Pluton
Sainte-Véronique Structure – Quebec 9 Syenite/Pluton
McGruther & Dell Lakes, Ontario ~2.3 Stratified Circular Feature
Mecatina Lake, Quebec ~6.4 Stratified Circular Feature
Fort Rae, NWT 2.8 Volcanic Crater
Crater Lake, Oregon 9.6 Volcanic Crater  7,700 (± 150) years
Lac De Gras, NWT Man Made Structure  Diamonds
Marmora, Ontario Man Made Structure  Iron
Timmins, Ontario Man Made Structure  Gold

“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
CANADIAN CRATERS
 

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.
 

Name Diameter (km) Age (megayears) Dating method Morphological type Notes
Barringer, Arizona 1.19 0.049 ± 0.003 Radioactive decay CONFIRMED Simple1 Jointed
Beaverhead, Montana/Idaho ~100 ~600 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Peak ring1 Allochthonous
Bloody Creek, Nova Scotia 0.350 X 0.420 ~0.012 Geological dating PROBABLE Simple1  Elliptical basin
Bow City, Alberta 6 <75 Geological dating PROBABLE Complex  No surface expression
Brent, Ontario 3.8 396 ± 20 K-Ar studies on the coarsely crystalline melt rocks CONFIRMED Simple1 Overflight of Brent Crater
Can-Am, Lake Huron 100 ~500 Geological dating PROBABLE Complex Underwater in Lake Huron
Carolina Bays, NC Various ~0.0129-0.14 Not firmly quantified POSSIBLE Simple1 Younger Drias black mat
Carswell, Alberta 39 115 ± 10 40Ar/39Ar Peak ring1 Multi-ring impact?
Charity Shoal, Lake Ontario ~1  ? POSSIBLE Simple1 underwater Lake Ontario Negative magnetic anomaly
Charlevoix, Quebec 54 342 ± 15 K-Ar CONFIRMED Peak ring1 Elevated Earthquake Zone
Charron Lake, Manitoba >4.5  ? POSSIBLE Simple1 Negative magnetic anomaly
Chicxulub, Yucatan, Mexico 150 66.043 ±0.011 40Ar/39Ar CONFIRMED Peak ring basin5 Cretaceous-Paleogene
Clearwater East, Quebec 26 ~460–470 Rb-Sr melt rocks CONFIRMED Complex1 Chondrite-type
Clearwater West, Quebec 32 290 ± 20 K-Ar melt rocks CONFIRMED Peak ring1
Cloud Creek, Wyoming 7 ~190 +/- 30 Ma Geological dating CONFIRMED Complex2 Chronostratigraphic
Corossol Structure, Gulf of St. Lawrence 4.0 ~0.012 14C age shells in sediments POSSIBLE Complex Underwater Gulf St. Lawrence
Decaturville Structure, Missouri 5.5 260-323 Geological dating CONFIRMED Complex2
Deep Bay, Saskatchewan 9.5 99 ± 4 Geological dating CONFIRMED Simple Flat-floored1 Cretaceous sediments
Des Plaines, Illinois 8 <280 Geological dating CONFIRMED Complex2
Dumas, Saskatchewan 4 <70 Geological dating PROBABLE Simple1 Seismic and borehole data
Eagle Butte, Alberta 10 <65 Geological dating CONFIRMED Complex2 Shatter-coned Cretaceous rocks
Eclipse Lake, Labrador small ~1.5  ? IMPROBABLE Simple1 – Possible flat-floored Two possible structures
Eclipse Lake, Labrador large ~6  ? IMPROBABLE Complex  Two possible structures
Elbow, Alberta 8 395 ± 25 Geological dating CONFIRMED Complex2 Brecciated Devonian strata
Franktown structure, Ontario ~2 >400 Ordovician sediment cover POSSIBLE Simple1 Circular depression
Glover Bluff, Wisconsin 8 <500 Geological dating CONFIRMED Complex2
Gow, Saskatchewan 5 <250 Radioactive decay CONFIRMED Complex 2 Smallest currently known complex
Hartney, Manitoba 6 <190 ± 20 Geological dating PROBABLE Complex? Structurally uplifted centre
High Rock Lake, Manitoba ~5 435 ± 10 Geological dating PROBABLE Complex
Holleford, Ontario 2.35 550 ±100 Geological dating CONFIRMED Simple1 Overflight of Holleford Crater
Howell Creek, BC 90-97 90-97 Between syenites and Cardium sands IMPROBABLE Simple1 Circular geologic formation
Hudson Bay Arc >450  ? IMPROBABLE Multi ring basin? No impact metamorphism found
Ile Rouleau, Quebec 4 <300 Geological dating CONFIRMED Complex3 Age based on stratigraphy
James River, Alberta 4.8 <480 Geological dating PROBABLE Complex No surface expression
Jocko, Ontario >0.2 <0.012 Created in glacial remains IMPROBABLE Simple1 Ground Exploration Video
Kakiattukallak Lake, Quebec 3 – 6  ? POSSIBLE Simple1 Possible Multiple Impact?
Lac Couture, Quebec 8 425 ± 25 Ar40-Ar39 melt rock CONFIRMED Complex1 Submerged central peak
Lac de Courval, Quebec ~1.6  ? POSSIBLE Simple1 Circular lake
Lac du Bonnet, Manitoba ~3.8  75 Sedimentary cover depth POSSIBLE Simple1 Circular magnetic anomaly
Lac La Moinerie, Quebec 8 400 ± 50 Ar40-Ar39 melt rock CONFIRMED Complex1
Lac La Moinerie (north), Quebec 1.8  ? IMPROBABLE Simple1 Circular structure
Manicouagan, Quebec 100 214 ± 1 Radioactive decay CONFIRMED Peak ring basin5 Zircon/melt rock dating
Manson, Iowa ~35 73.8 Ar40-Ar39 melt rock CONFIRMED Central peak1 No surface evidence
Maple Creek, Saskatchewan 6 <75 Geological & radioactive decay dating CONFIRMED Complex5 Disrupts Late Cretaceous rocks
Merewether, Labrador 0.19812 (largest of three) 0.00087? Sediment depth POSSIBLE Simple1 Possible methane explosion
Miami Florida Crater/Structure ~1 ~140 After Florida Plateau deposition IMPROBABLE Complex? Underwater off Miami
Mistastin, Labrador 28 36.6 ± 2 Ar40-Ar39 melt rock CONFIRMED Central peak basin6 Maskelynite
Montagnais, off Nova Scotia 45 50.5 ± 0.76 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex1 Submerged south of Nova Scotia, Canada
Newporte, North Dakota 3.2 <500 Geological biostratigraphic dating CONFIRMED Simple2 No surface evidence
Nicholson Lake, North West Territories 12.5 389 ± 6.7 Pb/U CONFIRMED Complex1 The large island within the lake is the eroded central peak
Panther Mountain, New York state 10 ~375 Geological dating PROBABLE Complex Inverted relief
Parry Peninsula, NWT 160 <65 Post Cretaceous IMPROBABLE Complex
Pilot Lake, North West Territories 6 445 ± 2 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex2 Dating based on one sample
Pingualuit, Quebec 3.44 1.4 ± 0.1 Ar40-Ar39 melt rock CONFIRMED Simple1 Overflight of Pingualuit Crater
Plevna/Tomvale Structure, ONTARIO ~0.01 <12,000 Years Created in glacial remains IMPROBABLE Simple1
Presqu’ile, Quebec 24 <500 Geological dating CONFIRMED Complex1 High level erosion
Purple Springs, Alberta 6 <75 Geological dating PROBABLE Complex  No surface expression
Red Wing, North Dakota 9.1 200 ± 25 Geological dating CONFIRMED Complex?8 Stratigraphy
Rock Elm, Wisconsin 6 420–440 Geological dating CONFIRMED Complex7 Youngest exposed rocks
Skeleton Lake, Ontario 3.5 ~800 Geological dating PROBABLE Simple1
Slate Islands, Lake Superior 32 436 Ma ± 3 Ar40-Ar39 melt rock CONFIRMED Complex1 Pseudotachylite dating
St. Martin, Manitoba ~40 227.8 ±0.9 Ar40-Ar39 melt rock CONFIRMED Complex1 Dauphin River diversion?
Sudbury, Ontario 250 1852 +4/-3 U-Pb zircon CONFIRMED Multi ring?1 Sudbury Distal Ejecta
Touchwood Hills, Saskatchewan >200 >541 Post Williston Basin deposit IMPROBABLE Multi-ring Basin?
Upheaval Dome, Utah 5.5 <170 Geological dating CONFIRMED Complex4 Younger than the Jurassic Navajo Sandstone
Victoria Island, California 5.5 37-49 Drilling data POSSIBLE Simple1 Geological dating
Viewfield, Saskatchewan 2.5 190 ± 20 Geological dating CONFIRMED Simple2 Jurassic-Triasic post-impact deposit
Wanapitei, Ontario 3 to 7.5 37.2 ± 1.2 K/Ar, Ar40-Ar39 melt rock CONFIRMED Simple1 – Possible flat-floored?1 L or LL chondrite projectile
West Hawk, Manitoba 2.44 100 Geological dating CONFIRMED Simple11 No reliable age
Whitecourt, Alberta 0.036 0.00113 14C dating of charcoal CONFIRMED Simple1 Medium octahedrite (Om) IIIAB

 

1 Dence, Michael R. Structural evidence from shock metamorphism in simple and complex impact craters: Linking observations to theory. Meteoritics & Planetary Science 39. Nr 2, 267-286 (2004).

2 Grieve R.A.F., Impact structures in Canada, Geological Association of Canada, 2006.

3 Spray J.G. et al. A marine magnetic study of the Ile Rouleau impact structure, Lake Mistassini, Quebec Canada. Meteoritics, 70th Annual Meeting (2007).

4 Eugene M. Shoemaker, Bryan J. Kriens, Ken E. Herkenhop, GEOLOGY OF THE UPHEAVAL DOME IMPACT STRUCTURE, SOUTHEAST UTAH. Journal of Geophysical Research–Planets, April 16, 1998.

5 Grieve R.A.F. and Head J.W. The Manicouagan impact structure: An analysis of its original dimensions and form. Journal of Geophysical Research 88:A807-A818 (1983).

6 French, B.M. Traces of Catastrophe, Lunar and Planetary Institute, 1998

7 Cordua, W. S., “The Rock Elm Structure, Pierce County, Wisconsin, a possible cryptoexplosion structure”, Geology, vol. 13, p. 372-374. 1985.

8Donofrio, Richard R., IMPACT CRATERS: IMPLICATIONS FOR BASEMENT HYDROCARBON PRODUCTION. Journal of Petroleum Geology, 3, 3, pp. 279-302, 1981.

 

NON-IMPACT GEOLOGICAL FEATURES

During my aerial meteorite crater explorations over various points of the North American Continent, I have noticed and documented a few geological features that are suspiciously shaped like meteorite craters. Also, I have investigated a few that were suggested by people who have contacted me after reading my crater articles. I have listed below the “crater like” structures that I have documented and could be confirmed as impact related if in the future evidence is found. I will be periodically adding more features as I visit them. If you have any additional information on any of the structures that I have documented or any new possible meteorite craters, please let me know.

 

Name Diameter KM Morphology Notes
Alsever Lake, Ontario ~4 Circular Formation Brent analog
Brackett Lake, NWT 8.67 Circular Formation
Canoe Lake area, Ontario 0.150 Circular Formation
Colter, Oklahoma, USA 0.150 Circular Formation
Hanson Lake, Saskatchewan 0.550 Circular Formation
La Loche, Saskatchewan 0.150 Circular Formation
North of Lake Superior, Ontario <0.050 Circular Formation
Otter Lake, Quebec <0.050 Circular Formation
Prince Edward Point, Ontario 0.400 Circular Formation
Quorn Lake, Ontario 1.73 Circular Formation
Riding Mountains, Manitoba 1.73 Circular Formation
South of Great Bear Lake, NWT 0.240 Circular Formation
Callander Bay – Ontaro 4 Syenite/Pluton  ~577 ma geological
Croker Island Complex, Ontario 10 Syenite/Pluton 1510 ±50 ma  – Rb-Sr
Lake Skootamatta, Ontario Presqu’ile analog ~5.5 Syenite/Pluton
Manitou Islands Complex, Ontario 4 Syenite/Pluton ~577  ma geological
Mount Moriah Structure – Ontaro ~5.5 Syenite/Pluton
Sainte-Véronique Structure – Quebec 9 Syenite/Pluton
McGruther & Dell Lakes, Ontario ~2.3 Stratified Circular Feature
Mecatina Lake, Quebec ~6.4 Stratified Circular Feature
Fort Rae, NWT 2.8 Volcanic Crater
Crater Lake, Oregon 9.6 Volcanic Crater  7,700 (± 150) years
Lac De Gras, NWT Man Made Structure  Diamonds
Marmora, Ontario Man Made Structure  Iron
Timmins, Ontario Man Made Structure  Gold

“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
CANADIAN CRATERS
 

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.
 

Name Diameter (km) Age (megayears) Dating method Morphological type Notes
Barringer, Arizona 1.19 0.049 ± 0.003 Radioactive decay CONFIRMED Simple1 Jointed
Beaverhead, Montana/Idaho ~100 ~600 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Peak ring1 Allochthonous
Bloody Creek, Nova Scotia 0.350 X 0.420 ~0.012 Geological dating PROBABLE Simple1  Elliptical basin
Bow City, Alberta 6 <75 Geological dating PROBABLE Complex  No surface expression
Brent, Ontario 3.8 396 ± 20 K-Ar studies on the coarsely crystalline melt rocks CONFIRMED Simple1 Overflight of Brent Crater
Can-Am, Lake Huron 100 ~500 Geological dating PROBABLE Complex Underwater in Lake Huron
Carolina Bays, NC Various ~0.0129-0.14 Not firmly quantified POSSIBLE Simple1 Younger Drias black mat
Carswell, Alberta 39 115 ± 10 40Ar/39Ar Peak ring1 Multi-ring impact?
Charity Shoal, Lake Ontario ~1  ? POSSIBLE Simple1 underwater Lake Ontario Negative magnetic anomaly
Charlevoix, Quebec 54 342 ± 15 K-Ar CONFIRMED Peak ring1 Elevated Earthquake Zone
Charron Lake, Manitoba >4.5  ? POSSIBLE Simple1 Negative magnetic anomaly
Chicxulub, Yucatan, Mexico 150 66.043 ±0.011 40Ar/39Ar CONFIRMED Peak ring basin5 Cretaceous-Paleogene
Clearwater East, Quebec 26 ~460–470 Rb-Sr melt rocks CONFIRMED Complex1 Chondrite-type
Clearwater West, Quebec 32 290 ± 20 K-Ar melt rocks CONFIRMED Peak ring1
Cloud Creek, Wyoming 7 ~190 +/- 30 Ma Geological dating CONFIRMED Complex2 Chronostratigraphic
Corossol Structure, Gulf of St. Lawrence 4.0 ~0.012 14C age shells in sediments POSSIBLE Complex Underwater Gulf St. Lawrence
Decaturville Structure, Missouri 5.5 260-323 Geological dating CONFIRMED Complex2
Deep Bay, Saskatchewan 9.5 99 ± 4 Geological dating CONFIRMED Simple Flat-floored1 Cretaceous sediments
Des Plaines, Illinois 8 <280 Geological dating CONFIRMED Complex2
Dumas, Saskatchewan 4 <70 Geological dating PROBABLE Simple1 Seismic and borehole data
Eagle Butte, Alberta 10 <65 Geological dating CONFIRMED Complex2 Shatter-coned Cretaceous rocks
Eclipse Lake, Labrador small ~1.5  ? IMPROBABLE Simple1 – Possible flat-floored Two possible structures
Eclipse Lake, Labrador large ~6  ? IMPROBABLE Complex  Two possible structures
Elbow, Alberta 8 395 ± 25 Geological dating CONFIRMED Complex2 Brecciated Devonian strata
Franktown structure, Ontario ~2 >400 Ordovician sediment cover POSSIBLE Simple1 Circular depression
Glover Bluff, Wisconsin 8 <500 Geological dating CONFIRMED Complex2
Gow, Saskatchewan 5 <250 Radioactive decay CONFIRMED Complex 2 Smallest currently known complex
Hartney, Manitoba 6 <190 ± 20 Geological dating PROBABLE Complex? Structurally uplifted centre
High Rock Lake, Manitoba ~5 435 ± 10 Geological dating PROBABLE Complex
Holleford, Ontario 2.35 550 ±100 Geological dating CONFIRMED Simple1 Overflight of Holleford Crater
Howell Creek, BC 90-97 90-97 Between syenites and Cardium sands IMPROBABLE Simple1 Circular geologic formation
Hudson Bay Arc >450  ? IMPROBABLE Multi ring basin? No impact metamorphism found
Ile Rouleau, Quebec 4 <300 Geological dating CONFIRMED Complex3 Age based on stratigraphy
James River, Alberta 4.8 <480 Geological dating PROBABLE Complex No surface expression
Jocko, Ontario >0.2 <0.012 Created in glacial remains IMPROBABLE Simple1 Ground Exploration Video
Kakiattukallak Lake, Quebec 3 – 6  ? POSSIBLE Simple1 Possible Multiple Impact?
Lac Couture, Quebec 8 425 ± 25 Ar40-Ar39 melt rock CONFIRMED Complex1 Submerged central peak
Lac de Courval, Quebec ~1.6  ? POSSIBLE Simple1 Circular lake
Lac du Bonnet, Manitoba ~3.8  75 Sedimentary cover depth POSSIBLE Simple1 Circular magnetic anomaly
Lac La Moinerie, Quebec 8 400 ± 50 Ar40-Ar39 melt rock CONFIRMED Complex1
Lac La Moinerie (north), Quebec 1.8  ? IMPROBABLE Simple1 Circular structure
Manicouagan, Quebec 100 214 ± 1 Radioactive decay CONFIRMED Peak ring basin5 Zircon/melt rock dating
Manson, Iowa ~35 73.8 Ar40-Ar39 melt rock CONFIRMED Central peak1 No surface evidence
Maple Creek, Saskatchewan 6 <75 Geological & radioactive decay dating CONFIRMED Complex5 Disrupts Late Cretaceous rocks
Merewether, Labrador 0.19812 (largest of three) 0.00087? Sediment depth POSSIBLE Simple1 Possible methane explosion
Miami Florida Crater/Structure ~1 ~140 After Florida Plateau deposition IMPROBABLE Complex? Underwater off Miami
Mistastin, Labrador 28 36.6 ± 2 Ar40-Ar39 melt rock CONFIRMED Central peak basin6 Maskelynite
Montagnais, off Nova Scotia 45 50.5 ± 0.76 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex1 Submerged south of Nova Scotia, Canada
Newporte, North Dakota 3.2 <500 Geological biostratigraphic dating CONFIRMED Simple2 No surface evidence
Nicholson Lake, North West Territories 12.5 389 ± 6.7 Pb/U CONFIRMED Complex1 The large island within the lake is the eroded central peak
Panther Mountain, New York state 10 ~375 Geological dating PROBABLE Complex Inverted relief
Parry Peninsula, NWT 160 <65 Post Cretaceous IMPROBABLE Complex
Pilot Lake, North West Territories 6 445 ± 2 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex2 Dating based on one sample
Pingualuit, Quebec 3.44 1.4 ± 0.1 Ar40-Ar39 melt rock CONFIRMED Simple1 Overflight of Pingualuit Crater
Plevna/Tomvale Structure, ONTARIO ~0.01 <12,000 Years Created in glacial remains IMPROBABLE Simple1
Presqu’ile, Quebec 24 <500 Geological dating CONFIRMED Complex1 High level erosion
Purple Springs, Alberta 6 <75 Geological dating PROBABLE Complex  No surface expression
Red Wing, North Dakota 9.1 200 ± 25 Geological dating CONFIRMED Complex?8 Stratigraphy
Rock Elm, Wisconsin 6 420–440 Geological dating CONFIRMED Complex7 Youngest exposed rocks
Skeleton Lake, Ontario 3.5 ~800 Geological dating PROBABLE Simple1
Slate Islands, Lake Superior 32 436 Ma ± 3 Ar40-Ar39 melt rock CONFIRMED Complex1 Pseudotachylite dating
St. Martin, Manitoba ~40 227.8 ±0.9 Ar40-Ar39 melt rock CONFIRMED Complex1 Dauphin River diversion?
Sudbury, Ontario 250 1852 +4/-3 U-Pb zircon CONFIRMED Multi ring?1 Sudbury Distal Ejecta
Touchwood Hills, Saskatchewan >200 >541 Post Williston Basin deposit IMPROBABLE Multi-ring Basin?
Upheaval Dome, Utah 5.5 <170 Geological dating CONFIRMED Complex4 Younger than the Jurassic Navajo Sandstone
Victoria Island, California 5.5 37-49 Drilling data POSSIBLE Simple1 Geological dating
Viewfield, Saskatchewan 2.5 190 ± 20 Geological dating CONFIRMED Simple2 Jurassic-Triasic post-impact deposit
Wanapitei, Ontario 3 to 7.5 37.2 ± 1.2 K/Ar, Ar40-Ar39 melt rock CONFIRMED Simple1 – Possible flat-floored?1 L or LL chondrite projectile
West Hawk, Manitoba 2.44 100 Geological dating CONFIRMED Simple11 No reliable age
Whitecourt, Alberta 0.036 0.00113 14C dating of charcoal CONFIRMED Simple1 Medium octahedrite (Om) IIIAB

 

1 Dence, Michael R. Structural evidence from shock metamorphism in simple and complex impact craters: Linking observations to theory. Meteoritics & Planetary Science 39. Nr 2, 267-286 (2004).

2 Grieve R.A.F., Impact structures in Canada, Geological Association of Canada, 2006.

3 Spray J.G. et al. A marine magnetic study of the Ile Rouleau impact structure, Lake Mistassini, Quebec Canada. Meteoritics, 70th Annual Meeting (2007).

4 Eugene M. Shoemaker, Bryan J. Kriens, Ken E. Herkenhop, GEOLOGY OF THE UPHEAVAL DOME IMPACT STRUCTURE, SOUTHEAST UTAH. Journal of Geophysical Research–Planets, April 16, 1998.

5 Grieve R.A.F. and Head J.W. The Manicouagan impact structure: An analysis of its original dimensions and form. Journal of Geophysical Research 88:A807-A818 (1983).

6 French, B.M. Traces of Catastrophe, Lunar and Planetary Institute, 1998

7 Cordua, W. S., “The Rock Elm Structure, Pierce County, Wisconsin, a possible cryptoexplosion structure”, Geology, vol. 13, p. 372-374. 1985.

8Donofrio, Richard R., IMPACT CRATERS: IMPLICATIONS FOR BASEMENT HYDROCARBON PRODUCTION. Journal of Petroleum Geology, 3, 3, pp. 279-302, 1981.

 

NON-IMPACT GEOLOGICAL FEATURES

During my aerial meteorite crater explorations over various points of the North American Continent, I have noticed and documented a few geological features that are suspiciously shaped like meteorite craters. Also, I have investigated a few that were suggested by people who have contacted me after reading my crater articles. I have listed below the “crater like” structures that I have documented and could be confirmed as impact related if in the future evidence is found. I will be periodically adding more features as I visit them. If you have any additional information on any of the structures that I have documented or any new possible meteorite craters, please let me know.

 

Name Diameter KM Morphology Notes
Alsever Lake, Ontario ~4 Circular Formation Brent analog
Brackett Lake, NWT 8.67 Circular Formation
Canoe Lake area, Ontario 0.150 Circular Formation
Colter, Oklahoma, USA 0.150 Circular Formation
Hanson Lake, Saskatchewan 0.550 Circular Formation
La Loche, Saskatchewan 0.150 Circular Formation
North of Lake Superior, Ontario <0.050 Circular Formation
Otter Lake, Quebec <0.050 Circular Formation
Prince Edward Point, Ontario 0.400 Circular Formation
Quorn Lake, Ontario 1.73 Circular Formation
Riding Mountains, Manitoba 1.73 Circular Formation
South of Great Bear Lake, NWT 0.240 Circular Formation
Callander Bay – Ontaro 4 Syenite/Pluton  ~577 ma geological
Croker Island Complex, Ontario 10 Syenite/Pluton 1510 ±50 ma  – Rb-Sr
Lake Skootamatta, Ontario Presqu’ile analog ~5.5 Syenite/Pluton
Manitou Islands Complex, Ontario 4 Syenite/Pluton ~577  ma geological
Mount Moriah Structure – Ontaro ~5.5 Syenite/Pluton
Sainte-Véronique Structure – Quebec 9 Syenite/Pluton
McGruther & Dell Lakes, Ontario ~2.3 Stratified Circular Feature
Mecatina Lake, Quebec ~6.4 Stratified Circular Feature
Fort Rae, NWT 2.8 Volcanic Crater
Crater Lake, Oregon 9.6 Volcanic Crater  7,700 (± 150) years
Lac De Gras, NWT Man Made Structure  Diamonds
Marmora, Ontario Man Made Structure  Iron
Timmins, Ontario Man Made Structure  Gold

“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
CANADIAN CRATERS