High resolution palaeoecological and taphonomic analysis of Early Cretaceous lake biota, western Liaoning (NE-China)

Journal article


Publication Details

Author(s): Fürsich F, Sha JG, Jiang B, Pan YH
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology
Publication year: 2007
Volume: 253
Journal issue: 3-4
Pages range: 434-457
ISSN: 0031-0182
Language: English


Abstract


The faunal content of eighteen bedding planes within the Jianshangou Unit of the Lower Cretaceous Yixian Formation of western Liaoning has been analysed in detail in order to understand the environmental and taphonomic framework of this famous lacustrine fossillagerstätte. The bedding planes were excavated within a 3 m thick section, which is composed of laminated mudstones, graded sandstones and mudstones, and horizontally stratified structureless sandstones and tuffs. All investigated bedding planes occur within the laminated mudstone facies and contain elements of the so-called Jehol Biota, in particular the conchostracan Eosestheria ovata, the ephemerid nymph Hexagenites trisetalis and the crustacean Liaoningogriphus quadripartitus. These three faunal elements occur in high abundance, originally possessed chitinous skeletons and are preserved as compressed, faintly mineralized coats or, in the case of Eosestheria, still possess organic material. The specimens do no represent exuviae, but body fossils. The fossils can be grouped into three low diversity associations, each characterized by one of the three taxa. The plan-view orientation of the taxa is invariably random and size frequency histograms are bimodal or polymodal. This indicates that the fauna is autochthonous and that the histograms reflect several recruitment phases. Apparently, the faunal elements suffered seasonal mass mortality caused by anoxic conditions, which became established in the lake during the summer months. Increased humidity during the winter led to mixing of the lake waters, re-establishment of oxic conditions and to deposition of a thin film of sediment. Such environmental conditions were episodically interrupted by flash floods and volcanic ash falls, which may have been responsible for the preservation of the more spectacular elements of the Jehol biota such as birds and feathered dinosaurs. © 2007 Elsevier B.V. All rights reserved.



FAU Authors / FAU Editors

Fürsich, Franz Prof. Dr.
Naturwissenschaftliche Fakultät


Additional Organisation
Lehrstuhl für Paläoumwelt


External institutions with authors

Nanjing Institute of Geology and Paleontology
Nanjing University


How to cite

APA:
Fürsich, F., Sha, J.-G., Jiang, B., & Pan, Y.-H. (2007). High resolution palaeoecological and taphonomic analysis of Early Cretaceous lake biota, western Liaoning (NE-China). Palaeogeography, Palaeoclimatology, Palaeoecology, 253(3-4), 434-457. https://dx.doi.org/10.1016/j.palaeo.2007.06.012

MLA:
Fürsich, Franz, et al. "High resolution palaeoecological and taphonomic analysis of Early Cretaceous lake biota, western Liaoning (NE-China)." Palaeogeography, Palaeoclimatology, Palaeoecology 253.3-4 (2007): 434-457.

BibTeX: 

Last updated on 2018-08-08 at 03:47