The Sea Monster from the Andes

In 1977, a farmer was plowing his field on a plateau high in the Andes mountains when he stumbled upon a giant fossilized skeleton. How did this giant marine reptile end up high in the Andes Mountains? Spanish subtitles/CC by Carlos J. Pardo De la Hoz. Thanks as always to Ceri Thomas for the excellent South American marsupials!: This video features this Paleogeographic Map: Scotese, C.R., 2019. Plate Tectonics, Paleogeography, and Ice Ages, YouTube video: