CRATER ABSOLUTE AGE

CRATER ABSOLUTE AGE

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
Hudson Bay Arc >450  ? Pre-Cambrian? IMPROBABLE Multi ring basin? No impact metamorphism found
Sudbury, Ontario 250 1852 +4/-3 U-Pb zircon CONFIRMED Multi ring? Sudbury Distal Ejecta
Skeleton Lake, Ontario 3.5 ~800 Geological dating PROBABLE Simple
Beaverhead, Montana/Idaho ~100 ~600 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Peak ring Allochthonous
Holleford, Ontario 2.35 550 ±100 Geological dating CONFIRMED Simple Overflight of Holleford Crater
Touchwood Hills, Saskatchewan >200 >541 Post Williston Basin deposit IMPROBABLE Multi-ring Basin?
Can-Am, Lake Huron 100 ~500 Geological dating PROBABLE Complex Underwater in Lake Huron
Glover Bluff, Wisconsin 8 <500 Geological dating CONFIRMED Complex
Newporte, North Dakota 3.2 <500 Geological biostratigraphic dating CONFIRMED Simple No surface evidence
Presqu’ile, Quebec 24 <500 Geological dating CONFIRMED Complex High level erosion
James River, Alberta 4.8 <480 Geological dating PROBABLE Complex No surface expression
Clearwater East, Quebec 26 ~460–470 Rb-Sr melt rocks CONFIRMED Complex Chondrite-type
Calvin, Michigan 7.24 450 ± 10 Geological dating CONFIRMED Complex
Pilot Lake, North West Territories 6 445 ± 2 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex Dating based on one sample
Bear Swamp, New York 3.5 ~444 Geological dating PROBABLE Simple No surface expression
Slate Islands, Lake Superior 32 436 ± 3 Ar40-Ar39 melt rock CONFIRMED Complex Pseudotachylite dating
High Rock Lake, Manitoba ~5 435 ± 10 Geological dating PROBABLE Complex
Lac Couture, Quebec 8 425 ± 25 Ar40-Ar39 melt rock CONFIRMED Complex Submerged central peak
Rock Elm, Wisconsin 6 420–440 Geological dating CONFIRMED Complex Youngest exposed rocks
Franktown structure, Ontario ~2 >400 Ordovician sediment cover PROPOSED Simple Circular depression
Lac La Moinerie, Quebec 8 400 ± 50 Ar40-Ar39 melt rock CONFIRMED Complex
Brent, Ontario 3.8 396 ± 20 K-Ar studies on the coarsely crystalline melt rocks CONFIRMED Simple Overflight of Brent Crater
Elbow, Alberta 8 395 ± 25 Geological dating CONFIRMED Complex Brecciated Devonian strata
Nicholson Lake, North West Territories 12.5 389 ± 6.7 Pb/U CONFIRMED Complex The large island within the lake is the eroded central peak
Flynn Creek, Tennessee ~3.8 382.03 ± 21 Geological dating Complex2 Shattercones
Panther Mountain, New York state 10 ~375 Geological dating PROBABLE Complex Inverted relief
Crooked Creek, Missouri ~7 ~348 – 323 Geological dating Complex2 Serial impact event?
Charlevoix, Quebec 54 342 ± 15 K-Ar CONFIRMED Peak ring Elevated Earthquake Zone
Weaubleau, Missouri 19 320 – 340 Geological dating PROBABLE Complex Ring-like drainages
Ile Rouleau, Quebec 4 <300 Geological dating CONFIRMED Complex Age based on stratigraphy
Middlesboro, Kentucky 6 <300 Geological dating Complex5 Dates to the formation of the supercontinent Pangaea 300 million years ago
Clearwater West, Quebec 32 290 ± 20 K-Ar melt rocks CONFIRMED Peak ring  Maskelynite
Des Plaines, Illinois 8 <280 Geological dating CONFIRMED Complex
Decaturville Structure, Missouri 5.5 260-323 Geological dating CONFIRMED Complex
Gow, Saskatchewan 5 <250 Radioactive decay CONFIRMED Complex Smallest currently known complex
St. Martin, Manitoba ~40 227.8 ±0.9 Ar40-Ar39 melt rock CONFIRMED Complex Maskelynite – Dauphin River diversion?
Manicouagan, Quebec 100 214 ± 1 Zircon/melt rock dating CONFIRMED Peak ring basin Maskelynite
Red Wing, North Dakota 9.1 200 ± 25 Geological dating CONFIRMED Complex? Stratigraphy
Wells Creek, Tennessee ~12 200 ± 100 Geological dating CONFIRMED Complex Shattercones
Viewfield, Saskatchewan 2.5 190 ± 20 Geological dating CONFIRMED Simple Jurassic-Triasic post-impact deposit
Cloud Creek, Wyoming 7 ~190 ± 30 Geological dating CONFIRMED Complex Chronostratigraphic
Hartney, Manitoba 6 <190 ± 20 Geological dating PROBABLE Complex? Structurally uplifted centre
Upheaval Dome, Utah 5.5 <170 Geological dating CONFIRMED Complex Younger than the Jurassic Navajo Sandstone
Miami Florida Crater/Structure ~1 ~140 After Florida Plateau deposition IMPROBABLE Complex? Underwater off Miami
Hotchkiss Structure, Alberta 3.9 120-330 Dated unconformity Proposed Complex Seismic research
Carswell, Alberta 39 115 ± 10 40Ar/39Ar Peak ring Multi-ring impact?
West Hawk, Manitoba 2.44 100 Geological dating CONFIRMED Simple No reliable age
Deep Bay, Saskatchewan 9.5 99 ± 4 Geological dating CONFIRMED Simple Flat-floored Cretaceous sediments
Kentland, Indiana ~13 >97 Geological dating CONFIRMED Complex Quarry
Steen River Albera 25 91 ± 7 K-Ar pyroclastic vesicular rock CONFIRMED Complex Magnesioferrite MgFe2O
Howell Creek, BC ~10 90-97 Between syenites and Cardium sands IMPROBABLE Simple Circular geologic formation
Lac du Bonnet, Manitoba ~3.8 75 Sedimentary cover depth PROPOSED Simple Circular magnetic anomaly
Bow City, Alberta 6 <75 Geological dating PROPOSED Complex  No surface expression
Maple Creek, Saskatchewan 6 <75 Geological & radioactive decay dating CONFIRMED Complex Disrupts Late Cretaceous rocks
Purple Springs, Alberta 6 <75 Geological dating PROBABLE Complex  No surface expression
Manson, Iowa ~35 73.8 Ar40-Ar39 melt rock CONFIRMED Central peak No surface evidence
Dumas, Saskatchewan 4 <70 Geological dating PROBABLE Simple Seismic and borehole data
Chicxulub, Yucatan, Mexico 150 66.043 ±0.011 40Ar/39Ar CONFIRMED Peak ring basin Cretaceous-Paleogene
Eagle Butte, Alberta 10 <65 Geological dating CONFIRMED Complex Shatter-coned Cretaceous rocks
Parry Peninsula, NWT 160 <65 K/T boundary timeframe IMPROBABLE Complex
Montagnais, off Nova Scotia 45 50.5 ± 0.76 K-Ar, 40Ar/39Ar and Rb-Sr CONFIRMED Complex Submerged south of Nova Scotia, Canada
Wanapitei, Ontario 3 to 7.5 37.2 ± 1.2 K/Ar, Ar40-Ar39 melt rock CONFIRMED Simple1 – Possible flat-floored? Maskelynite – L or LL chondrite projectile
Victoria Island, California 5.5 37-49 Drilling data PROPOSED Simple Geological dating
Mistastin, Labrador 28 36.6 ± 2 Ar40-Ar39 melt rock CONFIRMED Central peak basin Maskelynite
Chesapeake, Virginia ~85 35.5 ± .3 Geological dating CONFIRMED Complex Coesite in suevites
Pingualuit, Quebec 3.44 1.4 ± 0.1 Ar40-Ar39 melt rock CONFIRMED Simple Overflight of Pingualuit Crater
Barringer, Arizona 1.19 0.049 ± 0.003 Radioactive decay CONFIRMED Simple Jointed
Carolina Bays, NC Various ~0.0129-0.14 Not firmly quantified PROPOSED Simple Younger Drias black mat
Bloody Creek, Nova Scotia 0.350 X 0.420 ~0.012 Geological dating PROBABLE Simple  Elliptical basin
Corossol Structure, Gulf of St. Lawrence 4.0 ~0.012 14C age shells in sediments PROPOSED Complex Underwater Gulf St. Lawrence
Jocko, Ontario >0.2 <0.012 Created in glacial remains IMPROBABLE Simple Ground Exploration Video
Plevna/Tomvale Structure, ONTARIO ~0.01 <0.012 Created in glacial remains IMPROBABLE Simple
Whitecourt, Alberta 0.036 0.00113 14C dating of charcoal CONFIRMED Simple Medium octahedrite (Om) IIIAB
Merewether, Labrador 0.19812 (largest of three) 0.00087? Sediment depth IMPROBABLE Simple Possible methane explosion
Charity Shoal, Lake Ontario ~1  ? PROPOSED Simple underwater Lake Ontario Negative magnetic anomaly
Charron Lake, Manitoba >4.5  ? PROPOSED Simple1 Negative magnetic anomaly
Eclipse Lake, Labrador small ~1.5  ? IMPROBABLE Simple – Possible flat-floored Two possible structures
Eclipse Lake, Labrador large ~6  ? IMPROBABLE Complex  Two possible structures
Kakiattukallak Lake, Quebec 3 – 6  ? PROPOSED Simple Possible Multiple Impact?
Lac de Courval, Quebec ~1.6  ? PROPOSED Simple Circular lake
Lac La Moinerie (north), Quebec 1.8  ? IMPROBABLE Simple Circular structure