Seismosaurus (Earthquake Lizard) is an invalid genus of diplodocid dinosaur named in 1991. This genus was synonymized with the genus Diplodocus from the type species "S. halli" to D. hallorum in 2006.
Description[]
Their size may have not been enough to fend off the predators, so its could have had space for social capabilities and may have congregated in herds. They have long, tails with small spikes on their backs, and a small head. They possibly rarely congregated in mixed herds as the smaller creatures may have gotten stomped under their feet.