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GEOREF RECORD

Facies architecture and ichnology of Recent salt-marsh deposits; Waterside Marsh, New Brunswick, Canada

Shahin E. Dashtgard and Murray K. Gingras
Facies architecture and ichnology of Recent salt-marsh deposits; Waterside Marsh, New Brunswick, Canada
Journal of Sedimentary Research (July 2005) 75 (4): 596-607

Abstract

Identification of salt-marsh deposits in the rock record can aid in the paleoenvironmental reconstructions of ancient marginal-marine successions. Salt-marsh sediments exposed at Waterside Beach and in Waterside Marsh alongside the Bay of Fundy, Canada offer an opportunity to describe and define facies and facies associations in a temperate, mineralogenic salt marsh. Three facies associations are identified and represent the three main components of the Waterside Marsh-Beach depositional system. Facies Association (FA) 1 includes genetically related deposits that accumulate on the salt-marsh surface, FA2 comprises sediments deposited within the naturally formed tidal creeks, and FA3 encompasses sediments derived from the adjacent coarse-grained beach. Facies Associations 1 to 3 respectively comprise 3, 4, and 2 sedimentologically and ichnologically distinct facies. Application of these facies and facies associations to the rock record is dependent upon the preservation potential of the facies and the relative sea level (RSL) regime of the system. RSL in the Bay of Fundy is presently rising. This results in transgression of Waterside Beach and erosion of the upper 4 to 5 m of salt-marsh sediment at the beach-marsh interface. Consequently, the probability of sediments being preserved increases with distance from the seaward limit of the marsh and with depth. Sediments deposited on the salt-marsh surface well away from the seaward edge of the marsh (FA1) and those deposited at the base of the tidal creeks (FA2) have a high probability of being pre-served. Conversely, the coarse-grained clastic sediments of FA3 deposited near the seaward edge of the marsh will likely be eroded.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 75
Serial Issue: 4
Title: Facies architecture and ichnology of Recent salt-marsh deposits; Waterside Marsh, New Brunswick, Canada
Affiliation: University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton, AB, Canada
Pages: 596-607
Published: 200507
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 37
Accession Number: 2005-058892
Categories: Quaternary geologySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 2 tables, sketch map
N45°34'60" - N45°45'00", W65°04'60" - W64°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200536
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