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4 December 2015
The asteroid impact suspected of killing the dinosaurs may also have triggered a global algal bloom that contributed to a massive marine extinction more than 60 million years ago, according to a new study published in the Journal of Geophysical Research: Planets, a publication of the American Geophysical Union.
Around 66 million years ago, an asteroid 10 kilometers (six miles) in diameter slammed into the Yucatan peninsula, creating a crater 180 kilometers (110 miles) across and 20 kilometers (12 miles) deep. The Chicxulub impact sent tiny spheres of material up into the atmosphere where they became super-heated. Approximately 1023 of these microscopic spherules were ejected and re-entered the atmosphere to create a global carpet of silica glass 3-millimeters (0.19-inches) thick, known geologically as the Cretaceous-Paleogene layer.
21 December 2010
I’ve heard of stealth bombers and stealthy ninjas and even a super-sneaky magnitude 8 earthquake, but until today I hadn’t heard about stealth craters: large features, more than three kilometers across and more than 300 meters deep– definitely big enough to be obvious, one would think.
But not if it’s buried. One such crater lurks 1.2 kilometers underground in New York’s Finger Lakes Region. Located near Syracuse and close to the Bear Swamp National Forest, the crater is completely invisible from the surface.