NDLI: Early Maastrichtian benthos of the chalk at Kronsmoor, northern Germany: implications for Late Cretaceous environmental change

Content Provider	Springer Nature Link
Author	Engelke, Julia Linnert, Christian Mutterlose, Jörg Wilmsen, Markus
Copyright Year	2017
Abstract	Lower Maastrichtian strata (Belemnella obtusa and lower–middle B elemnella sumensis cephalopod biozones) at the Saturn quarry near Kronsmoor (northern Germany) were logged and sampled in detail (33 bulk samples of about 6 kg each) for high-resolution quantitative palaeoecological analysis of the benthic fauna. Following standardised preparation, the size fractions 500 μm–1 mm and >1 mm were considered, documenting a diverse benthic assemblage of bryozoans, brachiopods, bivalves, various echinoid taxa, asteroids, ophiuroids, crinoids, sponges, small-sized sabellids and serpulids, cirripedes and foraminifera. A general, gradual up-section increase in the abundance of benthic faunas was recognised. Furthermore, from the lower to the upper part of the section, epifaunal suspension feeders became more dominant as the mobile guilds (epifaunal and shallow infaunal) saw a reduction in numbers. These observations parallel results obtained from low-resolution macrofossil analyses of this interval that documented an impoverished lower and a rich upper assemblage, the latter clearly dominated by epifaunal suspension feeders. Palaeoecological data of benthic community relicts at Kronsmoor are indicative of increased nutrient availability during the early Maastrichtian. However, in the absence of any evidence of increased productivity in the overlying photic zone (calcareous nannofossil data), a lateral input (upwelling) of nutrient-rich waters onto the shelf to fuel the benthic ecosystem has to be considered. This view is supported by records of contemporaneous changes in latest Cretaceous ocean circulation that followed the latest Campanian cooling event, inclusive of a southward spread of waters of intermediate depth from high latitudes.
Starting Page	703
Ending Page	722
Page Count	20
File Format	PDF
ISSN	18671594
Journal	Palaeobiodiversity and Palaeoenvironments
Volume Number	97
Issue Number	4
e-ISSN	18671608
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-06-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Upper Cretaceous Chalk Sea Quantitative palaeoecology Benthic communities Environmental factors Paleontology Biodiversity Animal Systematics/Taxonomy/Biogeography Plant Systematics/Taxonomy/Biogeography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Geology Ecology, Evolution, Behavior and Systematics Global and Planetary Change Paleontology

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