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Coastal–fluvial palaeoenvironments and plant palaeoecology of the Lower Devonian (Emsian), Gaspé Bay, Québec, Canada

By
David H. Griffing
David H. Griffing
1
Department of Geological Sciences, Binghamton University, Binghamton, NY 13902-6000, USA (e-mail: jbridge@binghamton.edu)
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John S. Bridge
John S. Bridge
1
Department of Geological Sciences, Binghamton University, Binghamton, NY 13902-6000, USA (e-mail: jbridge@binghamton.edu)
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Carol L. Hotton
Carol L. Hotton
2
National Center for Biotechnology Information, NCBI/NLM/NIH, Bethesda, MD 20894; and National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA (e-mail: hotton@ncbi.nlm.nih.gov)
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Published:
January 01, 2000

Abstract

The Cap-aux-Os Member (of Emsian age) of the Battery Point Formation, Gaspé Bay, Québec, comprises coastal and fluvial deposits containing abundant, well-preserved remains of early land plants (embryophytes). Metres-thick sandstone bodies represent the deposits of the main river channels, including some that were tidally influenced. Thinner sandstone bodies within mudstone successions represent deposits of crevasse splays–levees, lacustrine deltas, tidal channels, flood-tidal deltas and washovers. Mudstone-dominant strata represent backswamps and marshes, lakes, coastal bays and tidal flats. Certain plants (trimerophytes, Huvenia and Sciadophyton) are particularly common on the moist, upper parts of near-coastal channel bars. They apparently germinated and grew rapidly on freshly exposed muds deposited during floods or exceptionally high tides. In situ zosterophylls are most common in backswamp and marshy areas, where they formed extensive, relatively long-lived stands. It is uncertain whether these plants were tolerant of brackish water or killed by it. However, absence of acritarchs in these in situ plant horizons suggests that they occupied primarily freshwater habitats. Transported Prototaxites and Spongiophyton, both interpreted as possible fungi, are the main components of fully non-marine channel deposits. It is no coincidence that the best-preserved plants are those that lived in moist, oxygen-poor settings. However, the occurrence of root traces in palaeosols and sparse fossil evidence suggests that embryophytes also occupied drier settings.

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Contents

Geological Society, London, Special Publications

New Perspectives on the Old Red Sandstone

Geological Society of London
Volume
180
ISBN electronic:
9781862394285
Publication date:
January 01, 2000

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