Cretaceous-Tertiary (Chicxulub) impact angle and its consequences

Details Cretaceous-Tertiary (Chicxulub) impact angle and its consequences Cretaceous-Tertiary (Chicxulub) impact angle and its consequences

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996geo....24..963s&link_type=abstract

Geology, vol. 24, Issue 11, p.963

Astronomy and Astrophysics

Astrophysics

47

Scientific paper

The Chicxulub impact structure exhibits asymmetries in its geophysical signatures that closely resemble asymmetries produced by oblique impacts in laboratory experiments and recognized on planetary surfaces. These asymmetric signatures suggest a trajectory for the Chicxulub bolide from the southeast to the northwest at a 20° 30° angle from the horizontal. As a result, biotic extinctions may have been most severe and catastrophic in the Northern Hemisphere. Geographic variation in the magnitude of the Cretaceous-Tertiary (K-T) “fern spike” and palynofloral extinctions are consistent with the proposed trajectory.

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