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Google Earth is an important tool. You will need it, or some other source of high resolution satelite images.
References:
Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling ~ R. B. Firestone et al
The Case for the Younger Dryas Impact Event: Mammoth, Megafauna, and Clovis Extinction, 12,900 Years Ago. ~ Richard. B. Firestone Phd. and
~C. Vance Haynes
Tunguska-1908 in light of the new Cosmogony of Minor Bodies
Deep Impact Mission to Tempel 1 Favors New Explosive Cosmogony of Comets
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