What caused the death of dinosaurs? Scientists have blamed their demise on everything from lowered sea levels to lowered sperm counts. Now William Clemens, a paleontologist at the University of California, Berkeley, has added to the mystery. His expedition, sponsored by the U.S. Geological Survey, uncovered a cache of 180 dinosaur bones in Alaska, several hundred miles farther north than the creatures had previously been found. Among the fossils are skeletal remains of hadrosaurs, plant-eating duck-billed dinosaurs that stood up to 15 ft. high, and the teeth of a Tyrannosaurus-type carnivore.
In Clemens' view, the discovery indicates that at least some...
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