Character and distribution of exposed glaciodeltaic deposits off outer Cape Cod, Massachusetts, and their effects on hydrogeology and benthic habitats

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 fi...

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Bibliographic Details
Published in:Geo-marine letters 2006-03, Vol.26 (1), p.51-57
Main Authors: Poppe, L J, Foster, D S, Danforth, W W
Format: Article
Language:English
Subjects:
Benthic fauna
Freshwater
Geology
Glacial lakes
Habitats
Hydrogeology
Hydrologic analysis
Marine
Marine ecology
Ocean floor
Sediment samplers
Sedimentation & deposition
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Summary: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.[PUBLICATION ABSTRACT]
ISSN:0276-0460
1432-1157
DOI:10.1007/s00367-005-0015-x