Other
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998natur.392..171s&link_type=abstract
Nature, vol. 392, p. 171
Other
28
Comets, Asteroids, Collisions, Hypervelocity Impact, Jupiter (Planet), Cretaceous-Tertiary Boundary, Stratigraphy, Radiometers
Scientific paper
We present evidence for a multiple impact event that occurred on Earth. Five terrestrial impact structures have been found to possess comparable ages, coincident with the Norian stage of the Triassic period. These craters are Rochechouart (France), Manicouagan and Saint Martin (Canada), Obolon' (Ukraine), and Red Wing (USA). When these impact structures are plotted on a tectonic reconstruction of the North American and Eurasian plates for 214 Myr before present, the three largest structures (Rochechouart, Manicouagan and Saint Martin) are colatitudinal at 22.8 deg and span 43.5 deg of palaeolongitude. These structures may thus represent the remains of a crater chain at least 4462 km long. The Obolon' and Red Wing craters, on the other hand, lie on great circles of identical declination with Rochechouart and Saint Martin, respectively. We therefore suggest that the five impact structures were formed at the same time (within hours) during a multiple impact event caused by a fragmented comet or asteroid colliding with Earth.
Kelley Simon P.
Rowley David B.
Spray John G.
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