A new look at an old jaw clarifies mammal evolution

On an expedition to Greenland in the summer of 1995 — their fifth season of digging in the tundra — a team including Stephen Gatesy, Neil Shubin, and Farish Jenkins had finally found something that might yield a clue about mammal evolution: A pair of one inch long jaws embedded in limestone. “When I first picked up the cell-phone sized slab of rock containing the two jaws I could tell that it was something important — multi-rooted teeth with...
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