#rocasaurus

[mesozoicmarket]

A dinosaur tooth of an indeterminate titanosaurian sauropod, possibly from the Allen Formation in Patagonia, Argentina. These teeth were previously dumped into the invalid Saltasaurus robustus, but many titanosaurs like Bonatitan and Rocasaurus have since been described from the region. This tooth previously had some restoration at the very tip which was removed.

[a-dinosaur-a-day]

Rocasaurus muniozi

Source: http://dinosauriosdeargentina.blogspot.com/2009/03/dinosaurios-de-rio-negro.html 

Name: Rocasaurus muniozi

Name Meaning: Roca City Reptile

First Described: 2000

Described By: Salgado & Azpilicueta

Classification: Dinosauria, Saurischia, Eusaurischia, Sauropodomorpha, Plateosauria, Massopoda, Sauropodiformes, Anchisauria, Sauropoda, Gravisauria, Eusauropoda, Neosauropoda, Macronaria, Titanosauriformes, Somphospondyli, Titanosauria, Lithostrotia, Saltasauridae

Rocasaurus is a titanosaur known from - surprise, surprise - the Allen Formation in Rio Negro Province, Argentina. It lived in the Campanian age of the Late Cretaceous, around 75 or so million years ago. It was about 8 meters long, though it could have been larger, since the specimen may be that of a juvenile. It is known from partial remains, and lived alongside Saltasaurus. 

Sources: 

http://www.prehistoric-wildlife.com/species/r/rocasaurus.html

https://en.wikipedia.org/wiki/Rocasaurus

Shout out goes to @azirigel!