Jeffery, C. H. 1997. All change at the K-T boundary? Echinoids from the Maastrichtian and Danian of the Mangyshlak Peninsula, Kazakhstan. Palaeontology 40, 659-712.

175916

Jeffery, C. H.

1997

40: 659-712

Publication

The Maastrichtian and Danian echinoid fauna of the Mangyshlak Peninsula, Kazakhstan is revised on the basis of new collections from three localities representing both a shallow water calcarenite facies and a deeper water chalk facies. The two chalk sections sampled have no biostratigraphically detectable breaks across the Cretaceous-Tertiary boundary. Sixteen species in 11 genera are recognized, including one new species, Cyclaster galei. Of these, 13 species are found only in Maastrichtian strata. The remaining three are found only in the Danian giving an apparent species extinction rate of 100 per cent. across the Cretaceous-Tertiary boundary in Mangyshlak. However, inspection of occurrence data from localities outside Kazakhstan shows that many of these species are in fact longer ranging than the Mangyshlak occurrences alone suggest. If this global data is taken into account the species extinction rate drops to 60 per cent. and the generic extinction rate to 25 per cent. This patter

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