Dating of the triassic period
The extinction event that closed the Triassic period has recently been more accurately dated, but as with most older geologic periods, the rock beds that define the start and end are well identified, but the exact dates of the start and end of the period are uncertain by a few million years.
During the Triassic, both marine and continental life show an adaptive radiation beginning from the starkly impoverished biosphere that followed the Permian-Triassic extinction.
A highly seasonal monsoon climate prevailed nearer to the coastal regions.
Although the climate was more moderate farther from the equator, it was generally warmer than today with no polar ice caps.
Since the mid-20th century more complete sequences have been discovered in North America, and these now serve as the standard for Triassic time in general.
Both the start and end of the Triassic are marked by major extinction events.This left the earth nearly barren and ripe for evolution.This also contributes to the dinosaurs becoming the dominant race on the earth at that time.The Triassic Period marked the beginning of major changes that were to take place throughout the Mesozoic Era, particularly in the distribution of continents, the evolution of life, and the geographic distribution of living things.At the beginning of the Triassic, virtually all the major landmasses of the world were collected into the supercontinent of activity picked up, and a period of continental rifting began.