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Holocene reworking of a sand sheet in the Merrimack Embayment, Western Gulf of Maine

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Publication Date

Citation

C.J. Hein, D.M. FitzGerald, and W. Barnhardt, 2007, Holocene reworking of a sand sheet in the Merrimack Embayment, Western Gulf of Maine: Coastal Education and Research Foundation.

Summary

Recent bathymetric, backscatter, and seafloor sediment samples demonstrate that a large sand sheet was formed in the inner shelf by the reworking of the Merrimack River lowstand delta (deposited 12 kya; currently at 45 m depth) and braid plain during the Holocene transgression. Asymmetric bedforms and distinct grain size distributions suggest the sand sheet is actively being reworked by inner-shelf processes. Bottom sediments range from silty sand at the submerged delta to coarse sand and fine gravel in the innermost shelf (depth: 10-50 m). Coarse-grained sand comprises an expansive (32 km2 ) featureless sand sheet centered off the Merrimack River. Fine-grained sand discontinuously overlies this sand sheet in many locations and forms [...]

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Type Scheme Key
local-index unknown 70191420
local-pk unknown 70191420

Citation Extension

conferenceThe International Coastal Symposium
languageEnglish
citationTypeConference Paper

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