The swampy, semitropical wilderness in southern Florida called the Everglades lies in a peculiar bowl-shaped depression that was bound to arouse the curiosity of geologists. They concluded years ago that the distinctive cavity was probably formed over many aeons as ground water slowly dissolved a surface layer of limestone. Now Geologist Edward J. Petuch, 36, of Florida International University in Miami, has another idea. In a report to the Geological Society of America's national convention in Orlando, he suggested that the Everglades are the mud-filled remains of an impact crater left by an asteroid that struck the earth 38 million years...
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