Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..94..385g&link_type=abstract
Earth and Planetary Science Letters, Volume 94, Issue 3-4, p. 385-397.
Other
10
Scientific paper
A detailed magnetostratigraphic investigation of the Agost section (Spain) containing the Cretaceous-Tertiary (K/T) boundary is reported. Thermal demagnetization-contrary to alternating field demagnetization-succeeds in revealing the polarity of the characteristic remanent magnetization, although an overlap in blocking temperature spectrum exists with a normal polarity, secondary magnetization component. The K/T boundary occurs at two-thirds from the base of a reversed polarity zone and by comparison with earlier results [1] this polarity zone is correlated to chron C29r.
Linear regression of sedimentation rates in other sections with an established magnetostratigraphy and containing the K/T boundary yields an age of 66.45 Ma for this boundary. On the basis of this age and the magnetic reversal ages of the Berggren et al. [13] polarity time scale, new first appearance (FAD) ages around the K/T boundary are suggested for the planktonic species Morozovella trinidadensis (Bolli) (66.04 Ma), Morozovella pseudobulloides (Plummer) (66.34 Ma), Eoglobigerina taurica (Bang) (66.41 Ma) and ``Globigerina eugubina'' Luterbacher & Premoli Silva (66.43 Ma).
de Jonge B. G. R.
Groot J. J.
Langereis Cor G.
Smit Jan
ten Kate G. H. Z. W.
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