The Ecology, Neoichnology and Sedimentology of Siliciclastic Hardground Communities: Implications for Trypanites Assemblages in the Rock RecordReportar como inadecuado




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Neoichnology, Gastrochaenolites, Ecology, Sedimentology, Siliciclastic Hardground, Trypanites Ichnofacies

Furlong, Carolyn Marie

Supervisor and department: Gingras, Murray Department of Earth and Atmospheric Sciences Zonneveld, John Paul Department of Earth and Atmospheric Sciences

Examining committee member and department: Duane Froese Department of Earth and Atmospheric Sciences Gingras, Murray Department of Earth and Atmospheric Sciences John Acorn Department of Renewable Resources Zonneveld, John Paul Department of Earth and Atmospheric Sciences

Department: Department of Earth and Atmospheric Sciences

Specialization:

Date accepted: 2014-05-02T13:17:06Z

Graduation date: 2014-11

Degree: Master of Science

Degree level: Master's

Abstract: The paleoecology of rocky substrates in the rock record is commonly interpreted based on ichnology the Trypanites ichnofacies and is frequently associated with a biotic assemblage with low diversity. However, analyses of two modern, siliclastic, intertidal hardground community at Lion Rock, located at Arcadia Beach State Park, Oregon, and Thomas Cove at Upper Economy, Nova Scotia Bay of Fundy, reveal diverse communities of boring, encrusting and squatting-clinging organisms. Through observations and descriptions of organism distribution and abundance, up to 45 species of flora and fauna are reported to inhabit the study areas. At Lion Rock, organisms reside within five littoral zones supra-, upper-, middle-, and lower littoral zones, and a newly established sublittoral zone on the sea stack. Borings are produced by Adula californiensis, Hiatella arctica, Penitella penita, and Zirfaea pilsbryi and are identified as Gastrochaenolites-type traces. At Thomas Cove, organisms inhabit eleven depositional sub-environments and borings are formed by Petricola pholadiformis and Zirfaea pilsbryi, and are also identified as Gastrochaenolites-type traces. Within the two studied localities, substrate, sediment type and thickness, water presence during low tide and water velocity control boring location and abundance. It is likely that ancient Trypanites communities had considerably higher diversity and faunal abundance than their ichnological record indicates. Comparisons with modern assemblages are thus crucial in assessing these environments in ancient successions.

Language: English

DOI: doi:10.7939-R3PK0778T

Rights: Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.





Autor: Furlong, Carolyn Marie

Fuente: https://era.library.ualberta.ca/



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