Tyrrell Sea

In today's world, Tyrrell Sea has become a topic of increasing interest to a wide range of people. From experts in the field to those just beginning to explore this topic, Tyrrell Sea has captured the attention and curiosity of many. Whether due to its relevance in today's society, its impact on daily life or its historical relevance, Tyrrell Sea is a topic that provokes a variety of opinions and discussions. In this article, we will explore different aspects of Tyrrell Sea, from its origin and evolution to its future implications. Throughout these pages, we will immerse ourselves in the fascinating world of Tyrrell Sea, with the aim of providing a comprehensive and enriching vision of this topic that is so relevant today.

The Tyrrell Sea, named after Canadian geologist Joseph Tyrrell, is another name for prehistoric Hudson Bay. It existed during the retreat of the Laurentide Ice Sheet.

Roughly 8,000 years BP, the Laurentide Ice Sheet thinned and split into two lobes, one centred over Quebec-Labrador, the other over Keewatin. This drained Glacial Lake Ojibway, a massive proglacial lake south of the ice sheet, leading to the formation of the early Tyrrell Sea.[1] The weight of the ice had isostatically depressed the surface as much as 270-280 m below its current level, making the Tyrrell Sea much larger than modern Hudson Bay.[1] Indeed, in some places the shoreline was 100 to 250 km further inland than at present.[2] It was at its largest roughly 7,000 years BP.[3]

Isostatic uplift proceeded rapidly after the retreat of the ice, as much as .09 m per year, causing the margins of the sea to regress quickly towards its present margins.[1] The rate of uplift decreased with time however, and in any event was nearly matched by sea level rise from the melting ice sheets.[2] When the Tyrrell Sea "became" Hudson Bay is difficult to define, as Hudson Bay is still shrinking from isostatic rebound.[3]

References

  1. ^ a b c Lajeuness, Patrick; Allard, Michael (2003). "The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the Quebec-Labrador ice margin in the Tyrrell Sea at 8 ka BP" (PDF). Canadian Journal of Earth Sciences. 40 (1): 65–76. Bibcode:2003CaJES..40...65L. doi:10.1139/e02-085. Archived from the original (PDF) on 2004-03-22.
  2. ^ a b "Geomorphology From Space, Plate C-24: Hudson Bay Shorelines." (Accessed 3/7/06)
  3. ^ a b Pielou, E. C. (1991). After the Ice Age. Chicago: University of Chicago Press. pp. 222–224. ISBN 0-226-66811-8.


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