Joanne Bourgeois, 1990. "Boundaries; A stratigraphie and sedimentologie perspective", Global Catastrophes in Earth History; An Interdisciplinary Conference on Impacts, Volcanism, and Mass Mortality, Virgil L. Sharpton, Peter D. Ward
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This chapter is written principally with respect to the Cretaceous/Tertiary boundary, but the specific examples given may be generalized to other boundaries of interest. Three issues are addressed: (1) the nature and definition of a stratigraphic boundary, (2) the difficulty in assigning an absolute age to that boundary, and (3) the pitfalls in determining the time span represented by strata bracketing a boundary. Whereas stratigraphic conventions are required to attack many problems, needless arguments are generated when more attention is paid to formal definition than to the scientific question at hand, and the problems generated by various models for boundary events can only be addressed with some understanding of the above three issues.