Peter M. Sheehan, David E. Fastovsky, Claudia Barreto, Raymond G. Hoffmann; Dinosaur abundance was not declining in a “3 m gap” at the top of the Hell Creek Formation, Montana and North Dakota: Comment and Reply. Geology ; 28 (12): 1151. doi: https://doi.org/10.1130/0091-7613(2000)28<1151:DAWNDI>2.0.CO;2
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We welcome J.D. Archibald's comment because it signifies that workers on both sides of the extinction controversy finally agree that the “3 m gap” does not imply that dinosaurs were in decline prior to the Cretaceous-Tertiary impact. We hope that this will no longer be an issue, and that was the goal of our paper.
Archibald suggests that the 3 m gap was not used in earlier literature to deny an abrupt extinction. We disagree because several reviews (e.g., MacLeod et al., 1997; Williams, 1994; Sarjeant, 1996) continue to cite this “rule” to deny abrupt extinction. The...