Author： vonhof H.B. Smit J.
Publisher： Springer Publishing Company
ISSN： 0016-7746
Source： Geologie en Mijnbouw, Vol.75, Iss.2, 1996-02, pp. : 275-282
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Abstract
The comparison of a detailed ^{87}Sr/^{86}Sr profile through the Maastrichtian of the ENCI, Curfs and Geulhemmerberg quarries in the Maastrichtian type area with a Late Maastrichtian to Early Danian seawater ^{87}Sr/^{86}Sr curve of the Bidart (France) and El Kef (Tunisia) sections provides a useful chronostratigraphy for these quarries. The best fit yields an accumulation rate of char 129 10 cm/ka for the upper 30 m of the Maastrichtian in the composite Curfs and ENCI section. Apparently, despite diagenetic alteration, the fossils from the Curfs and ENCI quarries partly retained their original seawater ^{87}Sr/^{86}Sr values. ^{87}Sr/^{86}Sr analyses of well-preserved heterohelicids in the Geulhemmerberg E-clay support the suggested Early Danian age of this clay. They also support the suggestion that the planktic foraminifer {it Heterohelix globulosa} survived the Cretaceous/Tertiary boundary event(s) for some 5 to 50 ka.
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