200 million years ago a lake existed in southern Connecticut, eastern North America. It was initially a deep lake, which was formed at the eastern edge of a geotectonic half graben. Many types of fishes took up residence in that lake, finding it a great place to live. However, the lake had a secret, and when it revealed its secret, hundreds of thousands of fish and other animals in the lake died. It is nature's example of pollution and mass fish kills. If you are interested in learning how the history of this lake was uncovered, and its deadly secrets exposed, go to: