Gizmodo: The oldest known dinosaur, which predates other specimens by 15 millions years, is found in a museum store room.
A team of palaeontologists has discovered what they think is the oldest known dinosaur: a new species which predates previous earliest dinosaur specimens by 15 million years. But they didn't have to go on an expedition or get their hands dirty to find it—they merely stumbled across it in a museum store room.
The fossilized remains were first found in Tanzania during the 1930s. They were studied on and off from the 1950s with little luck, and wound up in the store room of the Natural History Museum in London. Now, they've been re-examined, and dated to between 247 million and 235 million years ago. That puts them between 10 and 15 millions years older than the previous oldest dinosaur remains.