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Science 16 March 1984:
Vol. 223. no. 4641, pp. 1183 - 1186
DOI: 10.1126/science.223.4641.1183
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Articles

The End of the Cretaceous: Sharp Boundary or Gradual Transition?

W. ALVAREZ 1, L. W. ALVAREZ 2, F. ASARO 2, and H. V. MICHEL 2

1 Department of Geology and Geophysics, University of California, Berkeley 94720
2 Lawrence Berkeley Laboratory, University of California, Berkeley

Evidence indicates that the Cretaceous-Tertiary boundary is very sharp, and, within the limits of resolution, it is apparently synchronous at the various boundary localities. Arguments to the contrary, particularly those of Officer and Darke, are shown to invalid.

Submitted on July 14, 1983
Accepted on December 21, 1983


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