The Cretaceous-Tertiary transition

Details The Cretaceous-Tertiary transition The Cretaceous-Tertiary transition

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...219.1383o&link_type=abstract

Science, vol. 219, Mar. 25, 1983, p. 1383-1390.

Mathematics

Logic

64

Abundance, Fossils, Geochronology, Geological Surveys, Iridium, Paleomagnetism, Core Sampling, Lithology, Magnetic Anomalies, Mineralogy, Polarization (Charge Separation)

Scientific paper

The time duration of fossil sequences in six cores taken during the deep-sea drilling project are compared with magnetic reversal evidence in consideration of the source of the iridium anomaly in the Cretaceous-Tertiary (K-T) transition. Evidence has been found for a complete transition from Cretaceous to Tertiary taxa in a period of 100,000 yr. The K-T nannofossil transition is connected to the 29N polarity sequence in one deep sea core, and 29R in cores taken in Italy. Comparison of the sea bed cores with four cores taken in Italy and Spain suggest that the transition of fauna was discontinuous over a period of time, and not due to a single event. An examination of the iridium abundance as a function of depth, the differences in flux outputs, variations in the noble metal abundances normalized to extraterrestrial concentrations, the conceivable effects of a reducing environment, and the clay mineralogy of the boundary layer clays all indicate that a single catastrophic event was not responsible for the iridium anomaly.

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