Proglacial and prehistoric lakes of New England during the end of the Wisconsin Glacial Epoch of the Pleistocene Era.[1]
Lake Hitchcock was a glacial lake that formed approximately 15,000 years ago in the late Pleistocene epoch.[2] After the Laurentide Ice Sheet retreated, glacial ice melt accumulated at the terminal moraine and blocked up the Connecticut River, creating the long, narrow lake. The lake existed for approximately 3,000 years, after which a combination of erosion and continuing geological changes likely caused it to drain. At its longest, Lake Hitchcock stretched from the moraine dam at present-day Rocky Hill, Connecticut, to St. Johnsbury, Vermont (about 320 kilometres (200 mi)). Although the rift valley through which the river flows above Rocky Hill actually continues south to New Haven, on Long Island Sound, the obstructing moraine at Rocky Hill diverted the river southeast to its present mouth at Old Saybrook.
Lake Hitchcock is an important part of the geology of Connecticut. It experienced annual layering of sediments, or varves: silt and sand in the summertime (due to glacial meltwater) and clay in the wintertime (as the lake froze). Analysis of varves along Canoe Brook in Vermont was conducted by John Ridge and Frederick Larsen, including radiocarbon dating of organic materials. Their research indicates that the lake formed sometime prior to around 15,600 years ago. Later, abrupt changes in sediment composition around 12,400 years ago appear to mark the initial breaching of the lake's dam.[1] These varved lake deposits were later used by European settlers for brick-making. The lake was named after Edward Hitchcock (1793–1864), a geology professor from Amherst College who had studied it.
^ abRidge, John; Larsen, Frederick. "Re-evaluation of Antevs' New England varve chronology and new radiocarbon dates of sediments from glacial Lake Hitchcock". Geological Society of America. Retrieved 13 December 2016.
^Rittenour, Tammy. "Glacial Lake Hitchcock". Biology Department, University of Massachusetts Amherst. Archived from the original on 9 June 2015. Retrieved 12 June 2015.
41°49′N 72°38′W / 41.817°N 72.633°W / 41.817; -72.633 LakeHitchcock was a glacial lake that formed approximately 15,000 years ago in the late Pleistocene...
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creating the narrow lake. The lake extended from Manchester to Plymouth, New Hampshire. It is unknown when the lake was drained. LakeHitchcock is an important...
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valley for millions of years and was naturally dammed to form glacial lakeHitchcock during the last ice age. According to King's Handbook of Springfield...
Hunwadi/Ahnuhati-Bald Indian Lake – Hitchcock Creek/Át Ch'îni Shà Jump Across Kennedy Island K'distsausk/Turtle Point Khtada Lake Khutzeymateen Inlet Khyex...
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Hunwadi/Ahnuhati-Bald Indian Lake – Hitchcock Creek/Át Ch'îni Shà Jump Across Kennedy Island K'distsausk/Turtle Point Khtada Lake Khutzeymateen Inlet Khyex...
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northeastern United States'—richest soil, due to Ice Age deposits by glacial LakeHitchcock. The lower (southern) Connecticut River Valley features the city of...
Outaouais region of Quebec, more commonly known as the Ottawa Valley. LakeHitchcockLake Albany Wisconsin glaciation Saint Lawrence Rift System L.J. Chapman...
Sound. Glacial LakeHitchcock; 15,000 YBP in the valley of the Connecticut River. Glacial Lake Nantucket Sound in Massachusetts. Glacial Lake Narragansett...