Peter H. Schultz, Steven D'Hondt; Cretaceous-Tertiary (Chicxulub) impact angle and its consequences. Geology ; 24 (11): 963–967. doi: https://doi.org/10.1130/0091-7613(1996)024<0963:CTCIAA>2.3.CO;2
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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.