41. By the end of the Mesozoic era , the Appalachian Mountains had been eroded to an almost flat plain. 42. Regional subsidence returned during the Mesozoic Era , although total sediment thicknesses were much less than during the Paleozoic. 43. By the end of the Mesozoic Era , the Appalachian Mountains had been eroded to an almost flat plain. 44. These herbivores thus lived during the Mesozoic era , also known as the " age of the dinosaurs ". 45. Their endothermic capabilities provided them with a benefit over the mostly ectothermic dinosaurs that dominated the Mesozoic era . 46. Idaho continued to be a largely marine environment through the Triassic and Jurassic periods of the Mesozoic era . 47. Coelurosaurs persisted until the end of the Mesozoic Era , when all except for crown clade avians died out. 48. There are no fossils in Indiana from the interval spanning across the Permian period and the entire Mesozoic era . 49. This is the edge of a rift valley originating in the Mesozoic Era when Europe and North America separated. 50. They were the main food of Reproductive features of modern conifers had evolved by the end of the Mesozoic era .
