Presentation on theme: "The Age of Reptiles (and dinosaurs)"— Presentation transcript:
1The Age of Reptiles (and dinosaurs) The Mesozoic EraThe Age of Reptiles(and dinosaurs)
2The Mesozoic Era is divided into 3 periods, the Triassic, the Jurassic, and the Cretaceous Ammonite fossils are used as index fossils to date sedimentary rock layers from the Mesozoic.Changes in ocean environments during the Mesozoic led to many different types of ammonites that existed for short periods of time
4Mesozoic Earth: Pangea formed during the Permian and lasted into the Jurassic when continents began to shift and break into the continents we see today.The continental drift that lead to the breakup of Pangea is still happening today
9The Triassic PeriodPangea continued as a single, large landmass through most of the Triassic period. After a slow recovery from the Permian extinction, many kinds of reptiles evolved. Late in the period, the first mammals appeared.
10Reptiles were dominant on land and in the sea Ted Ed: The Game Changing Amniotic EggThe first dinosaurs evolved from reptiles in the early TriassicDinosaurs would not be very diverse until the Jurassic
15Gymnosperm plants became common The first mammals evolved from mammal-like reptiles in the late TriassicFirst mammals were small, rodent like, and ate insects.Gymnosperm plants became commonGymnosperms have seeds without a protective coatingThese plants are able to reproduce without a pool of water
25Dinosaurs developed into a varied and widespread group They became the dominant land animalBird-like dinosaurs with feathers evolvedThese dinosaurs could not fly, but were able to glideTed Ed: How Did Feathers evolve?
27The Cretaceous PeriodThe cretaceous is named for the enormous chalk deposits found in EuropeThe formed chalked formed by tiny plankton during this period.“Creta” means chalk in Greek.
28A greater diversity of life forms evolved during the Cretaceous period A greater diversity of life forms evolved during the Cretaceous period. Dinosaurs, birds, flowering plants, and small mammals all flourish.