This summer the U.S. Geological Survey (USGS) has been drilling a deep hole inside the edge of a 56-mile-wide impact crater created 35 million years ago when an asteroid or comet slammed into the ocean near the present-day mouth of the Chesapeake Bay. The USGS has been conducting the drilling project right in the backyard of the NASA Langley Research Center in Hampton, Va.
The above story is based on materials provided by U.S. Geological Survey. Note: Materials may be edited for content and length.
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U.S. Geological Survey. "USGS Takes "Cat Scan" Of Virginia Crater." ScienceDaily. ScienceDaily, 15 September 2000. <www.sciencedaily.com/releases/2000/09/000913204629.htm>.
U.S. Geological Survey. (2000, September 15). USGS Takes "Cat Scan" Of Virginia Crater. ScienceDaily. Retrieved April 20, 2014 from www.sciencedaily.com/releases/2000/09/000913204629.htm
U.S. Geological Survey. "USGS Takes "Cat Scan" Of Virginia Crater." ScienceDaily. www.sciencedaily.com/releases/2000/09/000913204629.htm (accessed April 20, 2014).