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Apr 26, 2012
Holocene Evolution of the Merrimack Embayment, Northern Massachusetts, Interpreted from Shallow Seismic Stratigraphy
Authors: Christopher J. Hein [email protected], Duncan M. FitzGerald [email protected], and Walter A. Barnhardt [email protected]Author Affiliations
Publication: Coastal Sediments '07
Abstract
Recent multi-beam, backscatter, and bottom sediment data demonstrate that a large sand sheet was formed in the inner shelf by the reworking of the Merrimack River lowstand delta and braid plain (12 kya) during the Holocene transgression. Seismic data reveal the presence of widespread channel cut-and-fill structures landward of the delta suggesting that much of the sand sheet consists of braided stream deposits. These features map into several sets of cut-and-fill structures, indicating the avulsion of the primary river channels, which creates the lobes of the paleo-delta. Truncations of these, cut-and-fill structures suggest that the braid plain deposits were probably reworked during the Holocene transgression and may have contributed sand to developing barriers that presently border the Merrimack Embayment.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Department of Earth Sciences, Boston University, 675 Commonwealth Ave., Boston, MA 02215. E-mail: [email protected]
Department of Earth Sciences, Boston University, 675 Commonwealth Ave., Boston, MA 02215. E-mail: [email protected]
United States Geological Survey, Woods Hole Science Center, 384 Woods Hole Road, Quissett Campus, Woods Hole, MA 02543-1598. E-mail: [email protected]
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