21. The bluntnose sixgill shark resembles many of the fossil sharks from the Triassic period . 22. These were primitive, vaguely crocodile-like, archosaurs that mostly lived during the Early Triassic period . 23. These nektonic carnivores lived during the Triassic period , Anisian age. 24. The plant-eating dinosaurs were known as prosauropods and date from the Triassic period , Richter said. 25. Geologically it is mostly Pre-Cambrian rock, with some areas dated to Permian and Triassic periods . 26. It existed in Madagascar during the Lower Triassic period . 27. It existed in Lebanon during the Middle Triassic period . 28. The river flows through areas underlain with bands of Triassic Period sandstone and Mercia Mudstone. 29. Its bedrock lithology is dominated by Upper Triassic period basalt at and around the summit. 30. The fossils have been dated to the Triassic Period , from the Anisian to Ladinian stages.
