GeoBlog |
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March 13, 2001
From Eureka alert: Do old glaciers cause new earthquakes in New Madrid, Missouri? "The ghost of past glaciers may still rattle the American Midwest. During the last ice age 20,000 years ago, a gigantic ice sheet invaded North America, weighing down the hard upper crust of the continent for millions of years. Eventually, the glaciers melted. Freed from the heavy pressure of the ice sheet, North America slowly rose. This glacial rebound continues even today and triggers quakes in the New Madrid fault zone in Missouri, Kentucky, Arkansas and Tennessee, says Stanford geophysicist Mark Zoback." This is a really intriguing idea, one that will no doubt get a lot attention from scientists.
March 02, 2001
From the BBC: Fossil fish in Chinese tale "Ancestors of the first fish that crawled on to land, giving rise to back-boned animals and eventually humans, probably arose in China...The discovery of a 400-million-year-old fossil fish at a site in what is now southern China throws light on a fishy "garden of Eden", where creatures first evolved lobe-like fins that went on to form limbs."
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