Sauroposeidon
The press release in 1999 immediately garnered international media attention, which led to many (inaccurate) news reports of "the largest dinosaur ever!". While "Sauroposeidon" likely represents the tallest known dinosaur taxon, it does not hold records for either the longest or most massive. "Patagotitan" or "Argentinosaurus" make better candidates for the title "World's Largest Dinosaur" (presuming to ignore, as is conventional, "Amphicoelias"), though incomplete fossil evidence makes exact rankings impossible.
Buitreraptor
"Buitreraptor" is from the early Late Cretaceous Candeleros Formation, dating to the Cenomanian-Turonian, about 94 million years ago, when South America was an isolated continent like Australia today. It was uncovered in a famous fossil site named "La Buitrera", the "vulture roost". Although dinosaurs are rare in this site, another nearby site had earlier yielded "Giganotosaurus", one of the largest known carnivorous dinosaurs.