The Danish Cretaceous-Tertiary boundary sequences have three unique claims: a shelf sea setting, rich benthonic faunas, and an insignificant stratigraphic break at the boundary. Outcrops in the central Danish Basin (northern Jylland) are the most complete while the boundary in the classical Stevns Klint section is marked by a minor disconformity.

Detailed data from Danish sections reveal a very complex biotic turnover. Long term changes of a number of Cretaceous taxa do not appear to be directly connected with boundary events but are due to evolutionary trends of different types. Short term boundary changes partly manifest themselves by increased turnover...