"At a place called Skytop Mountain, 10 miles west of State College, PennDOT engineers encountered a huge deposit of iron pyrite laced through the sandstone ridge. Exposed to air and water, this highly reactive material became an environmental nightmare, leaching sulphuric acid into a nearby stream and groundwater. Subsequent efforts to contain the damage have so far cost more than $79 million.
What caused this massive—and unexpected—sulphide deposit? Barry Scheetz and his colleague Ryan Mathur pin the blame on a meteor that crashed 35 million years ago smack into Chesapeake Bay."

Read more (http://www.rps.psu.edu/indepth/pyrite.html)

"The true impact of an asteroid or comet crashing near the Chesapeake Bay 35 million years ago has been examined in detail for the first time. The analysis reveals the resilience of life in the aftermath of disaster."

Read more (http://www.msnbc.msn.com/id/25396517/)

"Scientists drilling into the site where a giant meteorite smashed into the lower Chesapeake Bay millions of years ago have found one more surprise amid the microscopic life and pockets of prehistoric ocean.

The water is saltier than expected - and no one is sure why."

Read more (http://www.baltimoresun.com/news/local/bal-md.crater27jun27,0,1741920.story)