Open AccessProposal for the recognition of boundaries between Cretaceous stages by means of planktonic foraminiferal biostratigraphy
Author(s) -
P. L. Marks
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-1984-33-14
Subject(s) - paleontology , cenomanian , cretaceous , geology , foraminifera , biostratigraphy , extinction (optical mineralogy) , boundary (topology) , oceanography , mathematical analysis , mathematics , benthic zone
Planktonic foraminifera are a much used biostratigraphic tool for the subdivision of the Cretaceous System from the Albian upwards. A proposal is given for the recognition of Cretaceous stages, using major biostratigraphic events to mark their boundaries. Thus, the extinction of Globotruncanita calcarata marks the Maastrichtian - Campanian boundary; the extinction of Dicarinel/a asymetrica the Campanian -Santonian boundary; the entry of D. asymetrica the Santonian - Coniacian boundary; the entry of Dicarinella primitiva with Marginotruncana ex gr. renzi -sinuosa the Coniacian -Turonian boundary; the extinction of Rotalipora cushmani the Turonian - Cenomanian boundary; the extinction of Planomalina buxtorfi the Cenomanian - Albian boundary.