On a monospecific assemblage of sauropod dinosaurs from Patagonia; implications for gregarious behavior.

A monospecific bone bed of the cetiosaurid sauropod Patagosaurusfariasi is reported. Its implications for hypotheses of dinosaur gregarious behavior are discussed. Taphonomic data suggest catastrophic mass accumulation of the assemblage. Associated juveniles and adults suggest the remains of a social group or herd, and might suggest extended parental care among cetiosaurids.