Life began with a bang in Sudbury, 1.8 billion years ago: scientists
The Gazette (Montreal)
By Randy Boswell, Canwest News Service December 4, 2009 4:03 PM Locator map showing the site of a meteorite hit near Sudbury about 1.85 billion years ago ...
Did life begin in Sudbury?
Canada.com Fri, 04 Dec 2009 13:27 PM PST
The mountain-sized meteorite that struck Sudbury nearly two billion years ago already known to have made the northern Ontario city a global mining mecca may have also triggered changes in Earth's ocean chemistry that allowed complex life to begin evolving on the planet, two U.S. government scientists have theorized. ...
Showing posts with label Canada meteor impact crater. Show all posts
Showing posts with label Canada meteor impact crater. Show all posts
05 December 2009
09 March 2009
Exploring the Pingualuit Impact Crater 7MAR09
Photo by Charles O`Dale for the Journal of the Royal Astronomical Society
April, 9, 2009
Exploring the Pingualuit Impact Crater
by Charles O’Dale, Ottawa Centre (codale0806@rogers.com)
Introduction
The Pingualuit Impact Crater, located in northern Quebec at N 61° 16´ W 73° 40´, was the first structure in Canada for which an impact origin was proposed. The structure is classified as a simple crater, 2.8 km in diameter and 400 m deep. It is slightly larger than the smallest crater on the Moon that is observable from our planet (Meen 1951). The inner slopeof the 3.4-km-diameter rim averages 30° and the outer slope averages 10°. The rim extends to a diameter of ~4.6 km and continues gradually outward to merge with the surrounding terrain at ~6.6 km. The peak of the rim is ~160 m above the inner lake level and 120 - 150 m above the regional terrain. The lake within the crater, with a depth of over 250 m, is one ofthe deepest in North America. It is also one of the clearest in the world with a transparency of over 35 m. Dating using the isotope ratio 40Ar-39Ar (Grieve 2006) gives the impact structurean age of 1.4 ± 0.1 Ma. The Pingualuit Impact Crater was formerly named New Quebec Crater and, previous to that, Chubb Crater.
NOTE: Whole article is to be published soon and I will add more photos later.
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