GENERAL GEOLOGY

Detailed explanation-1: -The Jurassic period, from about 200 million to 145 million years ago, ushered in birds and mammals.

Detailed explanation-2: -Mesozoic (252-66 million years ago) means ‘middle life’ and this is the time of the dinosaurs. This era includes the Triassic, Jurassic, and Cretaceous Periods, names that may be familiar to you.

Detailed explanation-3: -From the dawn of the dinosaurs to their extinction, the Mesozoic was ruled by reptiles. Dinosaurs may have dominated this era, but it also saw the evolution of mammals, birds and flowering plants.

Detailed explanation-4: -Among the various clades of mammals in the Mesozoic are early monotremes and stem-members of the two therian groups. Metatheria is the total-group for Marsupialia, and is known from the Early Cretaceous onward. Eutheria, the total-group for Placentalia, goes all the way back to the earliest Late Jurassic.

Detailed explanation-5: -Birds evolved from maniraptoran theropod dinosaurs during the middle of the Mesozoic Era, over 150 Ma (million years ago). Many unique adaptations of modern birds, from flight feathers to coloured eggs, evolved amongst their dinosaurian predecessors.