The Quaternary geologic map of Connecticut and Long Island Sound basin

Stone, Janet Radway; Schafer, J.P.; London, Elizabeth Haley; Lewis, Reed S.; DiGiacomo-Cohen, Mary; Thompson, Woodrow B

doi:10.3133/ofr98371

Cited by 18 publications

(30 citation statements)

References 21 publications

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“…2005). Less prominent recessional moraines lie between the two major moraine belts on eastern Long Island and in southeastern Connecticut, and several of these have been mapped and described as double linear belts (Goldsmith 1982;Sirkin 1982;Stone et aL. 2005).…”

Section: Coastal-plain Sediments Ofmentioning

confidence: 99%

Seafloor character and sedimentary processes in eastern Long Island Sound and western Block Island Sound

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DiGiacomo-Cohen

Smith³

et al. 2006

Geo-Mar Lett

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Multibeam bathymetric data and seismic-reflection profiles collected in eastern Long Island and western Block Island Sounds reveal previously unrecognzed glacial features and modern bedforms. Glacial features include an ice-sculptured bedrock surface, a newly identified recessional moraine, exposed glaciolacustrine sediments, and remnants of stagnant-ice-contact deposits. Modern bedforms include fields of transverse sand waves, barchanoid waves, giant scour depressions, and pockmarks. Bedform asymmetry and scour around obstructions indicate that net sediment transport is westward across the northern par of the study area near Fishers Island and eastward across the southern par near Great Gull Island.

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Section: Coastal-plain Sediments Ofmentioning

confidence: 99%

Seafloor character and sedimentary processes in eastern Long Island Sound and western Block Island Sound

Poppe

DiGiacomo-Cohen

Smith³

et al. 2006

Geo-Mar Lett

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“…Gordon Connally (New York State Museum, Albany N.Y) presented the LGM at 25,000 years B.P and retreat sequences up the Hudson Valley including two readvances dated to 15,000 and 16,000 years B.P, using lake correlations with bulk 14 C chronologies. Janet R. Stone (U.S. Geological Survey, Groton, Conn.) presented new detailed maps [Stone et al, 2005] of Connecticut and the Long Island Sound basin. As Lake Connecti cut drained, ocean water filled the Sound and deltas were built into it from the Con necticut River.…”

Section: The Eastern Laurentide Ice Margin: An Overviewmentioning

confidence: 99%

“…The meeting participants agreed that joint research on tar geted morainal sites will provide robust deglaciation chronologies, thus enabling the measurement of the retreat speed of the Lau rentide Ice Sheet. Two recently published stra tegically important maps [Stone et al, 2002[Stone et al, , 2005 identify key sites.…”

Section: Future Research Questions and Strategiesmentioning

confidence: 99%

Enigmatic Eastern Laurentide Ice Sheet deglaciation

2006

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The retreat of the Laurentide Ice Sheet at the end of the last ice age represents a dramatic sequence of environmental change that is evident in geological records across North America. The details of when, where, how, and why the Laurentide Ice Sheet collapsed are critical to understanding ocean‐atmosphere‐ice dynamics during this period of significant global climate change. The retreat sequence along the eastern margin of the Laurentide Ice Sheet is especially relevant for understanding climate variability. Enormous amounts of freshwater were released into the North Atlantic following deglaciation, and an influx of freshwater into the North Atlantic Deep Water formation zone can potentially trigger abrupt climate changes. Determining the mechanisms and feedbacks involved in climate change at the end of the last ice age therefore requires an understanding of the relationship between the southern margin ice retreat and connected meltwater events to atmospheric and sea surface temperatures, ice‐rafting Heinrich events, sea level rise, and atmospheric greenhouse gas concentrations.

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“…In addition to the two major moraine belts described above, several less prominent recessional moraines lie between the moraines on eastern Long Island and to the north of the study area in southeastern Connecticut, and several of these have been mapped and described as double linear belts (Sirkin 1982;Stone et al 2005). Also, an unknown number of preWisconsinan glaciations can be inferred from isolated drift deposits and drilling data (Hartshorn 1976).…”

Section: Physical Settingmentioning

confidence: 99%

Glaciotectonic deformation associated with the Orient Point–Fishers Island moraine, westernmost Block Island Sound: further evidence of readvance of the Laurentide ice sheet

et al. 2012

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High-resolution seismic-reflection profiles collected across pro-glacial outwash deposits adjacent to the circa 18 ka B.P. Orient Point-Fishers Island end moraine segment in westernmost Block Island Sound reveal extensive deformation. A rhythmic seismic facies indicates the host outwash deposits are composed of fine-grained glaciolacustrine sediments. The deformation is variably brittle and ductile, but predominantly compressive in nature. Brittle deformation includes reverse faults and thrust faults that strike parallel to the moraine, and thrust sheets that extend from beneath the moraine. Ductile deformation includes folded sediments that overlie undisturbed deposits, showing that they are not drape features. Other seismic evidence for compression along the ice front consists of undisturbed glaciolacustrine strata that dip back toward and underneath the moraine, and angular unconformities on the sea floor where deformed sediments extend above the surrounding undisturbed correlative strata. Together, these ice-marginal glaciotectonic features indicate that the Orient Point-Fishers Island moraine marks a significant readvance of the Laurentide ice sheet, consistent with existing knowledge for neighboring coeval moraines, and not simply a stillstand as previously reported.

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The Quaternary geologic map of Connecticut and Long Island Sound basin

Cited by 18 publications

References 21 publications

Seafloor character and sedimentary processes in eastern Long Island Sound and western Block Island Sound

Seafloor character and sedimentary processes in eastern Long Island Sound and western Block Island Sound

Enigmatic Eastern Laurentide Ice Sheet deglaciation

Glaciotectonic deformation associated with the Orient Point–Fishers Island moraine, westernmost Block Island Sound: further evidence of readvance of the Laurentide ice sheet

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