Vulcanodon is an extinct genus of prehistoric creature that lived during the Early Jurassic period, approximately 200 million years ago. It is believed to be the earliest known dinosaur, and is one of the earliest known members of the sauropod group of dinosaurs. Vulcan
From Wikipedia
Vulcanodon is an extinct genus of sauropod dinosaur from the Early Jurassic uppermost Forest Sandstone of southern Africa. The only known species is V. karibaensis. Discovered in 1969 in Zimbabwe, it was regarded as the earliest known sauropod for decades, and is still one of the most primitive genera that has been discovered.