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The Journal of Foraminiferal Research; April 2005; v. 35; no. 2; p. 130-147; DOI: 10.2113/35.2.130
© 2005 Cushman Foundation for Foraminiferal Research
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Article

INFAUNAL BENTHIC FORAMINIFERA IN SOME NORTH AMERICAN MARSHES AND THEIR INFLUENCE ON FOSSIL ASSEMBLAGES

Richard Tobin, David B. Scott*, Eric S. Collins and Franco S. Medioli

Centre for Environmental and Marine Geology, Dalhousie University, Halifax, Nova Scotia B3H 3J5 Canada

* E-mail: David.Scott{at}dal.ca

We have looked at a series of living and total assemblages of foraminifera in cores from two well-studied salt marshes (Chezzetcook Inlet, Canada, and North Inlet, South Carolina) and replotted data from a marsh in Nanaimo, British Columbia. The data from the three sites indicate that: 1) the infaunal living specimens appear to have little impact on the total assemblages at depth; 2) there is little evidence of test breakdown except for the well-known dissolution of calcareous tests that occurs in these acidic marsh sediments, although there is an inexplicable taphonomic breakdown of specimens in the southeastern USA; 3) the upper 1-cm slice of sediment provides a representative assemblage to use as a modern analogue for fossil benthic foraminiferal assemblages (as opposed to larger segments); and 4) foraminifera do not migrate vertically in the sediment to escape seasonal ice.

We also include a taxonomic discussion of the most common Trochammina species, since some new names have been assigned to various formae of Trochammina macrescens.




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