The Triassic Period

Pangea Time Period Dinosaurs

Flora

Pangea was mostly a dry, hot desert with palm trees, ginkgoes, and other gymnosperms. Some small species of horsetail rushes (genus Equisetum), ferns, and marine algae also survived there.

EXTINCTION X;

Toward the end of this period, a new extinction event removed several groups of species while opening up new horizons for those that survived—especially the dinosaurs, which spread rapidly.

Giant conifers were among the trees that lived on Pangea

The biological crisis of the late Permian Period was followed by a slow resurgence of life in the Triassic Period. The Mesozoic Era has commonly been called the "Age of Reptiles," and its most famous members are the dinosaurs. In the earliest part of the period, the first representatives of today's amphibians appeared, and toward the end of the period the first mammals emerged. In the middle to late Triassic Period, the many families of ferns and conifers appeared that continue to exist today, as well as other groups of plants that are now extinct. •

were named in 1834 by German paleontologist Friedrich August von Alberti, who in doing so grouped the three rock formations that defined this period.

Triassic Period

FIRST COUSINS In addition to the dinosaui the pterosaurs—winged dinosaurs—and Lagosuchi, lived during the Triassic Period. Together these thr types of animals make up Ornithodira group, though is often debated today.

eStóbs

NUMEROUS SPECIES

Reptiles and mammals flourished alongside the dinosaurs.

Fauna

In addition to land reptiles, such as the crocodile, and the most primitive dinosaurs, such as Eoraptor, the first mammals appeared during this period.

A New World

250 to 203

plants to grow. There was only one continent, called Pangea, which was surrounded by a single ocean, Panthalassa. This supercontinent was the home of dinosaurs and other animals.

GREENHOUSE EFFECT A rapid, extreme global warming event is one of several possible causes of the great extinction of the late Permian Period. It could have created the hot, dry climate that prevailed during the Triassic Period.

MILLION YEARS AGO

The Earth had only one continental mass, called Pangea. This continent had an upper region called Laurasia and a lower region called Gondwana. The two areas were partly separated by the Tethys Sea, which later almost completely disappeared.

^^ After the extinction of nearly 95 percent of ^tf all life at the end of the Permian Period, the Earth was a dry place with hot deserts and rocky areas. Only the coasts had enough moisture for

+1 0

Post a comment