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Rubidge explains that about 300-million years ago, when terrestrial ecosystems started to develop, the only animals with backbones were fish and amphibians.
The Karoo region records a long period of geological ancestry of three groups of reptiles that gave rise to tortoises, dinosaurs, lizards, snakes and small mammals.
The park contains many well-preserved examples of animals that roamed the land about five million years ago and is described as possibly the most diverse collection of fossils of that age. The fossil display will run until the end of October 2012.
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The newly-discovered dinosaur nesting ground is believed to be more than 100-million years older than previously known nesting sites.
The fossils found in Karoo rock add to the country's already extraordinary fossil record.
There is a large crocodile-like reptile skull, Erythrosuchus, believed to be one of the most distant ancestors of dinosaurs.
The large hand of a Gorgonopsian clearly illustrates the hunting capabilities of these flesh-eating mammal-like reptiles.
The discovery of the clutch of eggs, which made international headlines, revealed important clues about the evolution of complex reproductive behaviour in early dinosaurs.
Speaking about this discovery in an earlier news report David Evans, curator of Vertebrate Palaeontology at the Royal Ontario Museum, said even though the fossil record of dinosaurs is extensive, there is very little information about their reproductive biology, particularly for early dinosaurs.