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A sporomorph ecogroup model for the Northwest European Jurassic - Lower Cretaceous : Concepts and framework

Author: Abbink, O.A. · Konijnenburg-van Cittert, J.H.A. van · Visscher, H.
Type:article
Date:2004
Source:Geologie en Mijnbouw/Netherlands Journal of Geosciences, 1, 83, 17-38
Identifier: 237643
Keywords: Geosciences · Late Jurassic · Palaeo-ecology · Palaeobotany · Palaeoclimate · Palynology · Sea-level · Cretaceous · Jurassic · paleoecology · paleoenvironment · Eurasia · Europe · Geological Survey Netherlands · Energy / Geological Survey Netherlands

Abstract

Based on recent vegetation distribution and an integration of macropalaeobotanical and palynological information, a palaeocommunity model is explored that may permit detailed interpretations of quantitative sporomorph distribution patterns in the Jurassic and Early Cretaceous of NW-Europe in terms of changes in palaeoenvironment (sea-level, climate). The conceptual model is based on the recognition of Sporomorph Ecogroups (SEGs) that reflect broad co-existing plant communities, viz. upland, lowland, river, pioneer, coastal, and tidally-influenced SEGs. In successive palynological assemblages, shifts in the relative abundance of SEGs are thought to be indicators of sea-level changes. Climatic changes may be recognised through significant shifts within the quantitative composition of individual SEGs.