Nastapoka arc - Wikipedia
The Nastapoka arc is a curved segment of the southeastern shore of Hudson Bay in Quebec, Canada, that extends from the most northerly of the Hopewell Islands to Long Island near the junction with James Bay. It is a prominent, near-perfect circular arc, covering more than 160° of a 450-kilometre-diameter (280 mi) circle. [1]
The Great Hudson Arc: A 250-mile-wide mystery | Jonathan Birge
On the southeast corner of Hudson Bay, the coastline traces a near perfect arc, roughly concentric on another ring of islands in the bay. So, what caused it? The obvious answer, proposed in the 1950s, is that it’s the remnants of a large impact crater.
What is that Strange Semi-Circular Shape in Hudson Bay
2023年9月26日 · On the formation of the mysterious Nastapoka Arch, in Hudson Bay (northeastern Canada), many hypotheses have circulated, and there have been harsh discussions about its geological origin. A huge asteroid? One of the hypotheses that has circulated in the past was that of the impact of an asteroid.
Hudson Bay (Nastapoka) Arc - Crater Explorer
The Hudson Bay (Nastapoka) Arc takes a great bite out of the east coast of Hudson Bay. This image documenting the depth of the Hudson Bay probably confirms that the Nastapoka Arc is NOT IMPACT related.
Ahead Of The Curve: Hudson Bay’s Semicircular Nastapoka Arc
2011年8月2日 · Assuming the Nastapoka Arc is the remnant of an ancient asteroid impact, it sure doesn’t act like one! Only two aspects of the area ring meteoric alarm bells: the exquisite, cookie-cutter sweep...
The Giant Canada Crater No One Can Explain
2015年7月6日 · In this week's Maphead column, Ken Jennings looks into a Canadian phenomenon: The Nastapoka Arc, a crater on the Hudson Bay whose existence remains a mystery. On June 26, 1611, one of the...
Hudson Bay was not formed by impact - YouTube
http://www.unb.ca/passc/ImpactDatabase/faq.htmlhttp://www.uwgb.edu/dutchs/Planets/impact-No.htmEvidence that Hudson Bay was not formed by asteroid impact.
Nastapoka Arc-A geological Puzzle in Hudson bay, Quebec
2023年1月30日 · In the mid-2000s, a researcher says that the curving shoreline of Hudson Bay could be an ancient impact crater that has been so reworked by geologic processes that the evidence of impact has been obscured. The Nastapoka arc largely consists of Archean age rocks of the Superior craton.
Dinosaur-killing asteroid was a twin terror - New Scientist
2013年2月1日 · Earth bears the scars of twin-asteroid impacts: the Clearwater Lakes near Hudson Bay in Canada, for instance, are really twin craters that formed about 290 million years ago. Examples like...
How was Nastapoka arc formed? - Our Planet Today
2022年10月3日 · Scientists already know that an asteroid—or perhaps a comet—struck Earth off Mexico’s Yucatán Peninsula. The resulting 110 miles/80 kilometers wide Chicxulub crater is thought to have caused a decades-long “impact winter” that killed the dinosaurs. Is there less gravity in Hudson Bay?