Patterns in dinosaur evolution

Patterns in dinosaur evolution - Patterns in dinosaur...

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Unformatted text preview: Patterns in dinosaur evolution We can see large scale patterns in dinosaur evolution through time that appear to be based on the position of the continents (which thus influenced the ability of animals to migrate over the globe) Paleogeography revisited In the Late Triassic there was a supercontinent called Pangea This allowed plants and animals to migrate over much of the globe and thus global biological diversity was low library.thinkquest.org/14001/graphics/pangea.gif This supercontinent slowly broke apart due to continental drift, which is driven by convection currents in the mantle http://library.thinkquest.org/C003124/images/convect.jpg These convection currents are driven by the Earths internal heat, which is generated by the decay of radioactive elements The splitting up of Pangea isolated populations of organisms that were once contiguous, allowing the subpopulations to evolve independently As we saw earlier, dinosaurs evolved in the Late Triassic, about 230-220 million years ago The oldest dinosaurs come from the Ischigualasto Formation of South America, which is about 228 ma (Late Carnian) Thus, it is believed that dinosaurs evolved in South America and radiated from there to the rest of the world library.thinkquest.org/14001/graphics/pangea.gif * Dinosaurs of the Ischigualasto Formation include Eoraptor ,...
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Patterns in dinosaur evolution - Patterns in dinosaur...

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