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I worked security at a construction site for the City of San Antonio back in 1986. Some Mammoth bones were uncovered by the crew and they were instructed to hide the find by their employers, a major construction company. The site was Dos Rios Treatment Plant on San Antonio's southeast side. The crew thought they were dinosaur bones, but it was more than likely that thye were Mammoth of Mastodon bones, both fairly common for thea ares.
Unlike the foreman's and higher up attitude, I find the site in South Dakota a real inspiration. Here the crew and owner, stopped all construction and wound up donating the site to the State of South Dakota. This is the most important find of its kind:
More than likely an astroid hit the tundra about 12,000 years ago and wiped out most of the larger animals and almost wiped out man in the North American continent. There is some evidence of this, and it has happened before and will likely happen again. When the astroid hit the frozen tundra, little evidence remained. It just melted away but they have found minute diamonds scattered across North America from the time period.
Do check out NatGeo's article (June 2009 issue I believe, but also briefly described on their website) about the Yellowstone Caldera, and it's multiple eruptions. and what effect that probably had on the greater global ecosystem.
Al Gore has nothing on this one!
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