Simplify the following text for a Grade 12 native English-speaking person.
Original: Diamantinasaurus ( meaning `` Diamantina River lizard '' ) is a genus of derived titanosaurian dinosaur from late Albian ( Early Cretaceous ) - age rocks of Australia .
Simplified: Diamantinsaurus is a genus of derived titanosaurian dinosaur from Early Cretaceous age rocks of Australia .