April 15, It occurred from During the Jurassic Period, the supercontinent Pangaea split apart. The northern half, known as Laurentia, was splitting into landmasses that would eventually form North America and Eurasia, opening basins for the central Atlantic and the Gulf of Mexico.
Effects[ edit ] Ranges of families tetrapods through the Triassic and Early Jurassic At least half of the species now known to have been living on Earth at that time became extinct.
This event vacated terrestrial ecological nichesallowing the dinosaurs to assume the dominant roles in the Jurassic period. This event happened in less than 10, years and occurred just before Pangaea started to break apart. Gradual climate changesea-level fluctuations or a pulse of oceanic acidification  during the late Triassic reached a tipping point.
However, this does not explain the suddenness of the extinctions in the marine realm. Asteroid impact, but so far no impact crater of sufficient size has been dated to coincide with the Triassic—Jurassic boundary. The unconfirmed Wilkes Land crater is of sufficient size and falls within the correct age range at million to million years old and 2.
Massive volcanic eruptions, specifically the flood basalts of the Central Atlantic Magmatic Province CAMPwould release carbon dioxide or sulfur dioxide and aerosolswhich would cause either intense global warming from the former or cooling from the latter. Carbon isotopes of lipids n-alkanes derived from leaf wax and ligninand total organic carbon from two sections of lake sediments interbedded with the CAMP in eastern North America have shown carbon isotope excursions similar to those found in the mostly marine St.
Contemporaneous CAMP eruptions, mass extinction, and the carbon isotopic excursions are shown in the same places, making the case for a volcanic cause of a mass extinction.
The catastrophic dissociation of gas hydrates suggested as one possible cause of the largest mass extinction of all time, the so-called " Great Dying " at the end of the Permian Period may have exacerbated greenhouse conditions.Massive floods of lava erupting from the central Atlantic magmatic province about million years ago may explain the Triassic-Jurassic extinction.
About 20 percent of all marine families went. The fourth major mass extinction event happened around million years ago at the end of the Triassic Period of the Mesozoic Era to usher in the Jurassic Period. This mass extinction event was actually a combination of smaller mass extinction periods that happened over .
The Triassic (/ t r aɪ ˈ æ s ɪ k /) is a geologic period and system which spans million years from the end of the Permian Period million years ago, to the beginning of the Jurassic Period Mya. The Triassic, Jurassic, and Cretaceous periods were marked out by geologists to distinguish among various types of geologic strata (chalk, limestone, etc.) laid down tens of millions of years ago.
Since dinosaur fossils are usually found embedded in rock, paleontologists associate dinosaurs with the. The Jurassic Period was the second segment of the Mesozoic Era.
It occurred from to million years ago, following the Triassic Period and preceding the Cretaceous Period. During the Jurassic Period, the supercontinent Pangaea split apart. The Jurassic Period was the second segment of the Mesozoic Era. It occurred from to million years ago, following the Triassic Period and preceding the Cretaceous Period.