pangea tethys tectonics supercontinent fossils triassic continents continent gondwana everest era early mesozoic tectonic formation landmasses paleogeography scotese britannica
cretaceous tectonics oceanic geology during continents palaeogeography breakup africa atlantic rifting paleontology pangea likely plaques tectonique azura escafandra historical dinosaurios
early north america geology jurassic earth world years pangea ago million continents dinosaurs accretion rifting south central jurasico ocean
earth map ago years millions firstpost history
pangea supercontinent triassic reconstruction