Brent vs Holleford
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Brent
Brent is a meteorite impact structure in Ontario's Algonquin Park. It is about 3.8 km in diameter and was first identified in 1951 from aerial photographs taken during a Canadian government survey. Geological studies describe it as a heavily eroded or 'fossil' crater cut into Precambrian gneiss and partly filled by younger Ordovician sediments and impact breccia. Because the surface rim is poorly...
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Holleford
Holleford is a buried meteorite impact structure in Ontario, Canada. Because the crater is not preserved as an obvious surface feature, its presence was identified through geophysical evidence, including magnetic and gravity surveys, during investigations in the 1950s. Holleford is studied as an example of an impact structure concealed beneath later geological materials. Its buried setting illustr...
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