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Author - title
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| details | Late Maestrichtian | Montana | Lerbekmo,J.F. et al. A normal polarity subchron that embraces the K/T Boundary: A measure of sedimentary continuity across the boundary and synchroneity of boundary events. (In: The Cretaceous-Tertiary Events and other Catastrophes in Earth History. G.Ryder et al, editors) | 1996 | |
| details | Late Maestrichtian | Montana | Sweet,A.R. et al. Sequential palynological changes across the composite Cretaceous - Tertiary (K/T) Boundary claystone and contiguous strata, western Canada and Montana, U.S.A. | 1999 |