When Did the First Dinosaurs Appear on Earth?

Answer

The oldest dinosaurs are known from rocks in Argentina and Brazil. They are about 230 million years old and were dominant for about 185 million years during the Mesozoic era, which was a section of the Phanerozoic aeon.
Q&A Related to "When Did the First Dinosaurs Appear on Earth?"
Dinosaurs first appeared during the Triassic period, around 280 MYA (Million Years Ago) and died out around 65.5 MYA. They evolved from Archosaurs, or "Ruling Reptiles"
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Brachiosaurus had a proportionally long neck, small skull,
http://www.chacha.com/question/what-are-the-appear...
The oldest dinosaur types are known from rocks in Argentina and Brazil and are about 230 million years old (Triassic era), and they died out about 63 million years ago when a six
http://answers.yahoo.com/question/index?qid=200801...
The first dinosaurs lived about 230 million years ago. They ran on their hind legs, with their forward-tilted body balanced by their tail. Ranging from the size of a coyote to a large
http://www.newscientist.com/article/dn9927-faq-din...
1 Additional Answer
Dinosaurs were a diverse group of reptiles that were dominant terrestrial vertebrates for over 160 million years. They existed from the late Triassic period, about 230 million years ago, until the end of the Cretaceous period of about 65 million years ago.
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