Chronology of glacial Lake Agassiz meltwater routed to the Gulf of Mexico

  title={Chronology of glacial Lake Agassiz meltwater routed to the Gulf of Mexico},
  author={Timothy G. Fisher},
  journal={Quaternary Research},
  pages={271 - 276}
  • T. Fisher
  • Published 1 March 2003
  • Geology
  • Quaternary Research
Abstract Sediment cores with new radiocarbon dates from the southern outlet of glacial Lake Agassiz indicate that meltwater delivery to the Mississippi valley was disrupted at 10,800 14C yr B.P. and the outlet was abandoned by 9400 14C yr B.P. These findings confirm the timing of generally accepted terminations of the Lockhart and Emerson Phases of Lake Agassiz. Additionally, the radiocarbon chronology indicates that the spillway was fully formed by 10,800 14C yr B.P. and that the occupancy in… 
Questioning the age of the Moorhead Phase in the glacial Lake Agassiz basin
Abstract The stratigraphy of sites within the Lake Agassiz basin that constrain the timing of the onset of the Moorhead low-water Phase is reexamined. Stratigraphic interpretation of the oldest date
Abandonment chronology of glacial Lake Agassiz's Northwestern outlet
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A late Lake Minong transgression in the Lake Superior basin as documented by sediments from Fenton Lake, Ontario
The evolution of the early Great Lakes was driven by changing ice sheet geometry, meltwater influx, variable climate, and isostatic rebound. Unfortunately none of these factors are fully understood.
River Warren boulders, Minnesota, USA: catastrophic paleoflow indicators in the southern spillway of glacial Lake Agassiz
Boulders resting on meltwater-sculpted and striated-granite bedrock near the head of the southern outlet spillway of glacial Lake Agassiz are used to generate paleodischarge calculations. The rounded
Opening of glacial Lake Agassiz’s eastern outlets by the start of the Younger Dryas cold period
The Younger Dryas (12.9 ± 0.1 to 11.7 ± 0.1 ka) was a return to cold conditions in the Northern Hemisphere during the last deglaciation. This climatic event was hypothesized to have been caused by a
Alternative routing of Lake Agassiz overflow during the Younger Dryas: new dates, paleotopography, and a re-evaluation
Abstract Overflow from glacial Lake Agassiz has been implicated in affecting late-glacial ocean circulation and climate. The timing of the diversion of Lake Agassiz overflow away from its southern
Megaflooding associated with glacial Lake Agassiz
Abstract Significant baseline and episodic megaflooding from glacial Lake Agassiz was routed to the south, east and north coasts of North America over the lake’s nearly 6000 year history. The five
Ages for the Big Stone Moraine and the oldest beaches of glacial Lake Agassiz: Implications for deglaciation chronology
Glacial Lake Agassiz has been implicated as the trigger for numerous episodes of abrupt climate change at the close of the last ice age, yet the beginning age of the lake has never been determined.
Impacts of post-glacial lake drainage events and revised chronology of the Champlain Sea episode 13-9 ka
Abstract Lithologic, CHIRP (Compressed High Intensity Radar Pulse) sonar, paleomagnetic, stable isotopic and micropaleontological analyses of sediment cores from Lake Champlain (New York, Vermont)
Early postglacial history of the southeastern Assiniboine Delta, glacial Lake Agassiz basin
New stratigraphic evidence from the Rossendale area, Manitoba, Canada, provides insight into the early postglacial evolution of the southeastern Assiniboine Delta. In this region, much of the upper


Glacial Lake Agassiz: The northwestern outlet and paleoflood
Valley morphology and sediment in the Fort McMurray region of Alberta indicate that a catastrophic flood discharged down the lower Clearwater and Athabasca river valleys 9900 yr B.P. Geomorphic and
Age verification of the Lake Gribben forest bed and the Younger Dryas Advance of the Laurentide Ice Sheet
Analysis of nine wood samples from the Lake Gribben forest bed near Lake Gribben, Michigan, yielded a combined age of 10 025 ± 100 14C years BP, which confirms and refines prior age estimates for the
Glacial Lake Agassiz: Its northwest maximum extent and outlet in Saskatchewan (Emerson Phase)
Abstract Six different lines of evidence support the hypothesis that glacial Lake Agassiz expanded an additional 70,000 km2 over that previously mapped in northwestern Saskatchewan and that the lake
Freshwater Forcing of Abrupt Climate Change During the Last Glaciation
It is found that periods of increased freshwater flow to the North Atlantic occurred at the same time as reductions in the formation of North Atlantic Deep Water, thus providing a mechanism for observed climate variability that may be generally characteristic of times of intermediate global ice volume.
Postglacial history and paleoecology of Wampum, Manitoba, a former lagoon in the Lake Agassiz basin
A small paleolagoon along the margin of the glacial Lake Agassiz basin near Wampum, Manitoba, 130 km southeast of Winnipeg, contains an unusually thick and continuous sequence of late-glacial and
Preboreal oscillation caused by a glacial Lake Agassiz flood
The Preboreal oscillation (PBO) has been attributed to increased meltwater, but the source of the meltwater and causative mechanism of the PBO has remained elusive. Here we attribute the source to a
Northwest outlet channels of Lake Agassiz, isostatic tilting and a migrating continental drainage divide, Saskatchewan, Canada
Lake cores obtained from the northwest outlet of glacial Lake Agassiz in northwest Saskatchewan, Canada, provide a minimum date for the cessation of the flood from the northwest outlet, and a
Megaflood erosion and meltwater plumbing changes during last North American deglaciation recorded in Gulf of Mexico sediments
Submicrometer variations in the median diameter of siliciclastic mud in Orca Basin, northern Gulf of Mexico, sensitively monitor Laurentide ice sheet runoff to the gulf during early stages of the
Changes in the Bathymetry and Volume of Glacial Lake Agassiz Between 11,000 and 9300 14C yr B.P.
The volume and surface area of glacial Lake Agassiz varied considerably during its 4000-year history. Computer models for seven stages of Lake Agassiz were used to quantify these variations over the
History of Laurentide meltwater flow to the Gulf of Mexico during the last deglaciation, as revealed by reworked calcareous nannofossils
The history of meltwater flow from the Laurentide Ice Sheet to the Gulf of Mexico during the last deglaciation, which holds possible implications for the cause of the Younger Dryas cold episode, is