"Researchers: Comet Collided with Earth 55.6 Million ..." Topic
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| Tango01 | 13 Feb 2017 3:22 p.m. PST |
…Years Ago. "In recent years, the warm period — known as the Paleocene-Eocene Thermal Maximum (PETM) — has become a major point of interest for researchers as it's perhaps the best past analog to today's human-induced climate change. Atmospheric carbon dioxide increased rapidly during this warming event, and an accompanying spike in global temperatures of about 5 to 8 degrees Celsius lasted for approximately 150,000 years. Among the suggested drivers are the intrusion of flood basalts into carbon-rich marine sediments, carbon degassing from volcanoes, and an extraterrestrial impact on Earth. Sorting through samples of sediment from the time period, Rensselaer Polytechnic Institute geochemist Dr. Morgan Schaller and co-authors discovered evidence of a comet strike in the form of tiny spherical droplets of glass called microtektites…"
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| Ghecko | 13 Feb 2017 3:25 p.m. PST |
I thought it was 55.7 million years ago so I stand corrected. |
| Tango01 | 14 Feb 2017 11:03 a.m. PST |
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