https://sedici.unlp.edu.ar/handle/10915/95720?show=full
The oldest lower Upper Cretaceous plesiosaurs (Reptilia, Sauropterygia) from southern Patagonia,...
upper cretaceousoldestlowerplesiosaursreptilia
https://www.earthexperience.org/database/p/plesiosaurs
Plesiosaurs — Earth Experience Museum
Plesiosaurs (Late Triassic – Late Cretaceous) Plesiosaurs were marine reptiles that lived during the age of the dinosaurs. Though not dinosaurs themselves,...
plesiosaursearthexperiencemuseum