Mathematics – Logic
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sci...223.1183a&link_type=abstract
Science (ISSN 0036-8075), vol. 223, March 16, 1984, p. 1183-1186.
Mathematics
Logic
35
Biological Evolution, Geochronology, Paleomagnetism, Impact Damage, Iridium, Stratigraphy
Scientific paper
Officer and Drake's (1983) criticism of the impact theory of the Cretaceous-Tertiary extinction is disputed. It is argued that this criticism includes erroneous T and delta-t evaluations, references made to studies in disagreement with other research, a mistaken interpretation of the smectite layer in Denmark as unimportant volcanic ash, and cited reports of iridium anomalies that were later shown to stem from contamination. Discussion of the Deep Sea Drilling Project (DSDP) site 384 is said to be misleading: that the core, when first taken, was noticeably affected by drilling and possibly burrowing, was not mentioned. In addition, it is claimed that nonreliable magnetostratigraphic results are used to conclude that the Cretaceous-Tertiary boundary of DSDP site 384 lies in polarity zone 29N. Finally, polarity correlation of land mammal ages and an iridium anomaly found within the reversed-polarity interval in eastern Montana are said to be ignored by the disputed reports.
Alvarez Luis W.
Alvarez Walter
Asaro Frank
Michel Helen V.
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