Large, four-legged brontosaurs
and swift, bipedal theropods blazed those trails across the gently sloping shores of a freshwater lake about 150 million years ago, says Katherine McCarville of the South Dakota School of Mines and Technology in Rapid City.
Hollywood used to offer us only teasing glimpses of stegosaurs and brontosaurs
, for fear that a longer gaze would reveal the tacky artifice of the special effects.
Over 150 species of sauropods, the long-necked, long-tailed four-footed herbivores informally called brontosaurs
, have been described.
And the Jurassic display had brontosaurs
and stegosaurs and allosaurs.
If one looks at it that way, it looks as though brontosaurs
were about as athletic as elephants," Alexander says.