Event beds or condensed unit? Analysis of a wood-log concentration in the Upper Jurassic of the Kachchh Basin, western India

Journal article


Publication Details

Author(s): Fürsich F, Alberti M, Pandey DK, Rai J
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology
Publisher: Elsevier B.V.
Publication year: 2017
Volume: 466
Pages range: 406-415
ISSN: 0031-0182
Language: English


Abstract


The 2-m-thick Wood-Log Bed is a highly ferruginous Middle Oxfordian rock unit exposed in the dry bed of the river Tramau in the Wagad Uplift of the eastern Kachchh Basin, western India, and composed of several layers. The bed contains, at several levels, permineralised conifer wood logs, seeds (Carpolites), cones (Araucarites), leaves (BrachyphyllumPodozamites), possible bennettitalean flowers (?Williamsonia), and abundant wood debris in a poorly sorted muddy sandstone with scattered coarse quartz grains. The wood concentration is interpreted as the result of episodic flash floods in the hinterland situated in the east. Associated with the wood fossils are abundant ammonites which, together with the ferruginous nature of the sediment, point to offshore sediment starvation. Decay of the plant material might have led to widespread anoxia at the sea floor which restricted the benthic macrofauna for much of the time. Thus, the Wood-Log Bed is the product of two processes, episodic flash floods and sediment starvation. Signs of these processes can be seen in age-equivalent sediments throughout the Kachchh Basin.



FAU Authors / FAU Editors

Fürsich, Franz Prof. Dr.
Lehrstuhl für Paläontologie


External institutions
Christian-Albrechts-Universität zu Kiel
University of Rajasthan


How to cite

APA:
Fürsich, F., Alberti, M., Pandey, D.K., & Rai, J. (2017). Event beds or condensed unit? Analysis of a wood-log concentration in the Upper Jurassic of the Kachchh Basin, western India. Palaeogeography, Palaeoclimatology, Palaeoecology, 466, 406-415. https://dx.doi.org/10.1016/j.palaeo.2016.10.036

MLA:
Fürsich, Franz, et al. "Event beds or condensed unit? Analysis of a wood-log concentration in the Upper Jurassic of the Kachchh Basin, western India." Palaeogeography, Palaeoclimatology, Palaeoecology 466 (2017): 406-415.

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Last updated on 2018-08-08 at 00:51