Location of the impact structure in Iowa, United States
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Manson impact structure (Iowa)
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The Manson impact structure is an impact structure near the site of Manson, Iowa where an asteroid or comet nucleus struck the Earth during the Cretaceous Period, approximately 74 Ma.[1] It was one of the largest known impact events to have happened in North America.[2] Previously it was thought to have led to the extinction of the dinosaurs until isotopic ages proved that it was too old.[3]
^"Manson". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2017-10-09.
^"The Manson impact was the biggest thing that has ever occurred on the mainland United States. Of any type. Ever," Bill Bryson, A Short History of Nearly Everything 2003:238.
^Pfeiffer, Eric. "Ancient meteorite standing between one Iowa town and its water supply". Yahoo! News. Retrieved 17 February 2012.
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to Spencer Cobbold in London who named them Filaria Bancrofti. Patrick Manson in Xiamen, China (then called Amoy) made two important observations. Firstly...
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of the few impact events that have occurred in a populated area (few other examples are Kaali crater in Estonia and 2007 Carancas impact event in Peru)...
the Java Memory Model, Part 2" (PDF). IBM. Retrieved 2010-10-18. Jeremy Manson and Brian Goetz (February 2004). "JSR 133 (Java Memory Model) FAQ". Retrieved...