A brachiosaur tooth found in South Korean sediments represents the first evidence that this huge, plant-eating dinosaur once roamed Asia, say the researchers who dug up the tooth.
Brachiosaur teeth are easy to recognize, explains Jong-Deock Lim, a paleontologist at the Natural History Museum at the University of Kansas in Lawrence. When the top and bottom teeth wore against each other, the crowns developed chisel-shaped surfaces that were self-sharpening. Many large, herbivorous dinosaurs instead had rounded, spoon-shaped teeth, Lim says.
The 3-centimeter-long brachiosaur tooth was found near Jingu, South Korea, along a dinosaur trackway. The tracks had been imprinted in sediments laid down along the shore of a freshwater lake between 110 and 125 million years ago. Lim and his colleagues describe their discovery, which has been posted online, in an upcoming issue of Naturwissenschaften.
Some of the footprints in the trackway measure up to 1 meter across a