Morphotype biostratigraphy, diachronism, and bivalve recovery in the earliest Danian of Denmark

Bulletin of the Geological Society of Denmark

Rasmussen, E.S. 2004–12–15:¹ 

[1] Stratigraphy and depositional evolution of the uppermost Oligocene –Miocene succession in western Denmark. Bulletin of the Geological Society of Denmark, Vol. 51, pp. 89–109. © 2004 by Geological Society of Denmark. ISSN 0011–6297.

关键词: Oligocene;    Miocene;    North Sea;    Denmark;    eustacy;    climate;    tectonics;    sequence stratigraphy.;   

学科分类：地球科学(综合)

来源: Dansk Geologisk Forening

【 摘 要 】

Morphotype ratios among planktonic foraminifers are used as a stratigraphic tool within the Cerithium Limestone, part of the lowermost Danian type sequence at Stevns Klint, Denmark. Enhanced stratigraphic resolution provided by the method indicates that the base of the limestone is diachronous, becoming progressively younger northwards. The bivalve fauna of the Cerithium Limestone represents an early recovery fauna exhibiting a gradual recovery pattern from zero species at the stratigraphic base of the limestone to a rather constant level about 20 species through the upper half of the unit. A continuous cline, covering the entire stratigraphic interval, results when using evenness or dominance, rather than species number, as a community measure. This reflects a continued growth in equitability and decline in dominance, also after the levelling of the species number.

【 授权许可】

Unknown