Character and distribution of exposed glaciodeltaic deposits off outer Cape Cod, Massachusetts, and their effects on hydrogeology and benthic habitats |
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Authors: | L J Poppe D S Foster W W Danforth |
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Institution: | (1) U.S. Geological Survey, 384 Woods Hole Road, Woods Hole, MA 02543, USA |
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Abstract: | Seabed outcrops of glaciodeltaic sediments were identified in four places east of Cape Cod, Massachusetts, during seismic-reflection,
multibeam bathymetric and backscatter, bottom photographic, and sediment sampling surveys. These strata record coarser-grained
ice-proximal glaciofluvial topset to finer-grained distal glaciolacustrine bottomset deposition within deltaic systems that
prograded southwestward into glacial lakes from the South Channel lobe about 18 ka b.p. These beds are important because they (1) influence the outer Cape’s hydrogeologic framework, and (2) constitute relatively
stable, locally rough habitats within an area of seafloor dominated by mobile sand and gravelly sediment, and benefit the
benthic fauna by providing shelter and a substrate amenable to burrow construction. |
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