Page "Sauropodomorpha" Paragraph 4

One of the earliest known sauropodomorphs, Saturnalia, was small and slender ( 1. 5 metres, or 5 feet long ), but by the end of the Triassic they were the largest dinosaurs of their time, and in the Jurassic / Cretaceous they kept on growing.

Ultimately the largest sauropods like the Supersaurus, Diplodocus hallorum, and Argentinosaurus reached 30 – 40 metres ( 100 – 130 ft ) in length, and 60, 000 – 100, 000 kilograms ( 65 – 110 US short tons ) or more in mass.