Scientists in Brazil announced the discovery of one of the world's oldest fossils believed to belong to an ancient reptile dating back some 237 million years that could help explain the rise of the dinosaurs.

So far, what Gondwanax and its fellow silesaurids reveal is that the rise of the dinosaurs wasn’t a sudden, dramatic event. Instead, it was a slow, steady evolution, filled with false starts and subtle adaptations. The findings appeared in the journal Gondwana Research.

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Scientists from Brazil say a recently discovered fossil may help explain how dinosaurs evolved and came to rule the planet. The bones date back to approximately 237 million years ago, making them contemporary to the Middle-Upper-Triassic period of history,

Paleontologist Rodrigo Temp Muller with Universidade Federal de Santa Maria, working with colleagues in Brazil, has confirmed the finding of one of the oldest dinosauromorph fossils ever uncovered in South America.

Brazilian researchers discovered a 237-million-year-old reptile fossil that might be a precursor to the dinosaur, though only the size of a small dog. As one of the world’s oldest fossils, they discovered a new species of silesaurids – an extinct family from the Late Triassic period.