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The Mesozoic Era [3] is the era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods.It is characterized by the dominance of gymnosperms such as cycads, ginkgoaceae and araucarian conifers, and of archosaurian reptiles such as the dinosaurs; a hot greenhouse climate; and the tectonic break-up of Pangaea.
The beginning of the Triassic was around present sea level, rising to about 10–20 metres (33–66 ft) above present-day sea level during the Early and Middle Triassic. Sea level rise accelerated in the Ladinian, culminating with a sea level up to 50 metres (164 ft) above present-day levels during the Carnian.
Permian–Triassic boundary at Frazer Beach in New South Wales, with the End Permian extinction event located just above the coal layer [2]. Approximately 251.9 million years ago, the Permian–Triassic (P–T, P–Tr) extinction event (PTME; also known as the Late Permian extinction event, [3] the Latest Permian extinction event, [4] the End-Permian extinction event, [5] [6] and colloquially ...
The Cretaceous (IPA: / k r ɪ ˈ t eɪ ʃ ə s / krih-TAY-shəss) [2] is a geological period that lasted from about 143.1 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest.
The Middle Triassic spans the time between 246.7 Ma and 237 Ma (million years ago). It is preceded by the Early Triassic Epoch and followed by the Late Triassic Epoch. The Middle Triassic is divided into the Anisian and Ladinian ages or stages. [7] Formerly the middle series in the Triassic was also known as Muschelkalk.
A third factor which played a role in the Mesozoic-Cenozoic radiation was the K-Pg extinction, which marked the end of the dinosaurs and, surprisingly, resulted in a massive increase in biodiversity of terrestrial tetrapods, which can almost entirely be attributed to the radiation of mammals. There are multiple things which could have caused ...
Now, with J.R.R. Tolkien's birthday approaching on January 8, it's time for a whole new generation of fans to discover Middle-earth. If you haven’t read the series, how I envy you! Newcomers are ...
This produced a Mesozoic CO 2 high that contributed to the very warm climate of the Early Cretaceous. [56] The opening of the Tethys Ocean also contributed to the warming of the climate. [ 57 ] The very active mid-ocean ridges associated with the breakup of Pangaea raised sea levels to the highest in the geological record, flooding much of the ...