Q.Which period was called “Age of fishes”? a) Permian b) Triassic c) Devonian d) Ordovician

The geological time scale divides Earth's roughly 4.5-billion-year history into three major eras — Paleozoic, Mesozoic and Cenozoic — themselves subdivided into periods and, for the more recent periods, further into epochs, each characterised by its own dominant fauna and flora (Table 6.1). The Paleozoic (Cambrian through Permian) is marked by the dominance of marine invertebrates giving way to early fishes, amphibians and reptiles. The Mesozoic — the 'Golden Age of Reptiles' — spans the Triassic, Jurassic (dinosaur dominance, Archaeopteryx) and Cretaceous (extinction of dinosaurs and toothed birds). The Cenozoic, the age of mammals, splits into the Tertiary (five epochs tr …