Dark Days Doomed Dinosaurs, Say Purdue Scientists WEST LAFAYETTE, Ind. ? Though the catastrophe that destroyed the dinosaurs' world may have begun with blazing fire, it probably ended with icy darkness, according to a Purdue University research group. By analyzing fossil records, a team of scientists including Purdue's Matthew Huber has found evidence that the Earth underwent a sudden cooling 65 million years ago that may have taken millennia to abate completely. The fossil rock samples, taken from a well-known archaeological site in Tunisia, show that tiny, cold-loving ocean organisms called dinoflagellates and benthic formanifera appeared suddenly in an ancient...