Open AccessConiacian to Maastrichtian stage boundaries in the standard section for the Upper Cretaceous white chalk of NW Germany (Lagerdorf-KronsmoorHemmoor): Definitions and proposals
Author(s) -
Max-Gotthard Schulz,
Gundolf Ernst,
Hugo A. Ernst,
Friedrich Schmid
Publication year - 1984
Publication title -
bulletin of the geological society of denmark
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.674
H-Index - 28
eISSN - 2245-7070
pISSN - 0011-6297
DOI - 10.37570/bgsd-1984-33-19
Subject(s) - paleontology , geology , cretaceous , stage (stratigraphy) , section (typography) , facies , group (periodic table) , extinction (optical mineralogy) , physics , structural basin , quantum mechanics , advertising , business
Four large quarries in northern Germany provide a continuous section from the Middle Coniacian to Upper Maastrichtian, consisting almost throughout of a white chalk facies. The combined section has a thickness of 570 m. It has been sub-divided biostratigraphically into 33 zones. The vertical ranges of the species of the stratigraphically relevant groups have been determined on the basis of about 30 years of systematic collecting of fossils bed by bed. Belemnites, inoceramids, echinoids, crinoids and brachiopods occur throughout the section, ammonites only in the Campanian and Maastrichtian. The following proposals are put forward for the definition of the stage boundaries: Campanian/Maastrichtian: appearance of Belemnella lanceolata, nearly coincident with the first occurrence of Hoploscaphites constrictus; Santonian/Campanian: level of phylogenetic development of Gonioteuthis granulataquadrata from G. granulata, coincident with the extinction of Marsupites testudinarius; Coniacian/Santonian: appearance of Inoceramus ( Cladoceramus) undulatoplicatus nearly coincident with the appearance of the Inoceramus pachti!cardissoides group.