Two separate extinctions brought end to dinosaur era ??
Dinosaur die out might have been second of two
closely timed extinctions by Vince Stricherz,
University of Wisconsin, September 5, 2012
Two separate extinctions brought end to
dinosaur era. NewScientist, August 3, 2012,
The paper is
Tobin, T. S., P. D. Ward, E. J. Steig, E. B. Olivero,
I. A. Hilburn, R. N. Mitchell, M. R. Diamond, T. D.
Raub, and J. L. Kirschvink, 2012, Extinction
patterns, δ18 O trends, and magnetostratigraphy
from a southern high-latitude Cretaceous–
Paleogene section: Links with Deccan volcanism.
Palaeogeography, Palaeoclimatology, Palaeoecology.
vol. 350–352, pp. 180–188.