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End Cretaceous Extinction grades to background

Wang, SC 2003 On the continuity of background and mass extinction.
_Paleobiology_: Vol. 29, No. 4, pp. 455-467.

"my findings here support a continuity of magnitude. It is intriguing
that such a discontinuity of cause can produce a continuity of
magnitude-that the effect of a bolide impact, though more extreme,
nonetheless produces results that are not qualitatively different from
results produced by terrestrial factors."

Wang is critical of histograms because of the arbitrariness of bin
construction.  His statistical method allows an estimation of a
continuous line...he is surprised to find that the end Creataceous
extinctions do not form an outlier.