* Permian – Triassic extinction event

* Triassic – Jurassic extinction event

# Triassic – Jurassic extinction event ( End Triassic ): 205 Ma at the Triassic-Jurassic transition.

# Permian – Triassic extinction event ( End Permian ): 251 Ma at the Permian-Triassic transition.

The start of the period is marked by the major Triassic – Jurassic extinction event.

For example geochemical signatures from rocks may help to discover when life first arose on Earth, and analyses of carbon isotope ratios may help to identify climate changes and even to explain major transitions such as the Permian – Triassic extinction event .< ref name =" Twitchett "> A relatively recent discipline, molecular phylogenetics, often helps by using comparisons of different modern organisms ' DNA and RNA to re-construct evolutionary " family trees "; it has also been used to estimate the dates of important evolutionary developments, although this approach is controversial because of doubts about the reliability of the " molecular clock ".

The Permian – Triassic extinction event, labeled " End P " here, is the most significant extinction event in this plot for marine genus | genera which produce large numbers of fossils.

The scientists speculate that this impact may have caused the Permian – Triassic extinction event, although its age is bracketed only between 100 million and 500 million years ago.

The Paleozoic Era ended with the largest mass extinction in Earth's history, the Permian – Triassic extinction event.

The Permian – Triassic ( P – Tr ) extinction event, informally known as the Great Dying, was an extinction event that occurred 252. 28 Ma ( million years ) ago, forming the boundary between the Permian and Triassic geologic periods, as well as the Paleozoic and Mesozoic eras.

Additionally, the largest flood basalt event ( the Siberian Traps ) occurred around 250 Ma and was coincident with the largest mass extinction in history, the Permian – Triassic extinction event, although it is also unknown whether it was completely responsible for the extinction event.

The massive eruptive period was approximately coincident with the Permian – Triassic extinction event.

The Triassic began in the wake of the Permian – Triassic extinction event, which left the Earth's biosphere impoverished ; it would take well into the middle of the period for life to recover its former diversity.

* Asteroid impact, but so far no impact crater of sufficient size has been dated to coincide with the Triassic – Jurassic boundary.

simple: End – Triassic extinction event

The entire class of Conodonts are postulated to have been wiped out by the Triassic – Jurassic extinction event, which occurred roughly 200 million years ago.

The end of the Permian saw a major turnover in fauna during the Permian – Triassic extinction event.

# REDIRECT Permian – Triassic extinction event

There is evidence that snowfalls were common in the higher latitudes and the tropics became wetter than during the Triassic and Jurassic.

The Jurassic is a geologic period and system that extends from Ma ( million years ago ) to Ma ; that is, from the end of the Triassic to the beginning of the Cretaceous.

The southeast corner of the country is underlain by sediments of the Karoo System of Permian to Late Triassic age and a strip of Jurassic age sediments along the coast in the Mombasa area.

The era is subdivided into three major periods: the Triassic, Jurassic, and Cretaceous, which are further subdivided into a number of epochs and stages.

Different studies have come to different conclusions about the amount of oxygen in the atmosphere during different parts of the Mesozoic, with some concluding oxygen levels were lower than the current level ( about 21 %) throughout the Mesozoic, some concluding they were lower in the Triassic and part of the Jurassic but higher in the Cretaceous, and some concluding they were higher throughout most or all of the Triassic, Jurassic and Cretaceous.

They appeared in the Late Triassic period, and lasted until the late Jurassic.

Ranges of families tetrapods through the Triassic and Early Jurassic.

The isotopic composition of fossil soils of end Triassic and Early Jurassic has been tied to a large negative carbon isotope excursion ( Whiteside et al.

*** Family Mawsoniidae ( Triassic and Jurassic )

Their fossils may be found in small numbers in rocks from the Triassic period, and became common in the Jurassic and later periods.

A Triassic, Jurassic and Cretaceous time scale.

The water of the GAB is held in a sandstone layer laid down by continental erosion of higher ground during the Triassic, Jurassic, and early Cretaceous periods.

The lower ( Triassic ) boundary is set by the Permian-Triassic extinction event, during which approximately 90 % to 96 % of marine species and 70 % of terrestrial vertebrates became extinct.

There has been a lively scientific debate as to whether other major extinctions, including the ones at the end of the Permian and Triassic periods might also have been the result of large impact events, but the evidence is much less compelling than for the end Cretaceous extinction.

This divergent boundary first formed in the Triassic period when a series of three-armed grabens coalesced on the supercontinent Pangaea to form the ridge.

1998 ), quickly gave rise to true ichthyosaurs sometime around the boundary between the Early Triassic and Middle Triassic.

The date is actually quite close to the Permian / Triassic boundary, one of the largest mass extinction events in Earth's history.

The massive eruptive event which formed the traps, one of the largest known volcanic events of the last 500 million years of Earth's geological history, continued for a million years and spanned the Permian – Triassic boundary, about 251 to 250 million years ago.

If this biostratigraphical indicator is used, then technically the Lias Group — a lithostratigraphical division — spans the Jurassic / Triassic boundary.

Thus it is necessary to determine whether it straddles the boundary or not: if not, then the CAMP couldn ’ t be a cause of the Triassic # Late Triassic extinction event.

These two levels can be correlated with chron E23r of the Newark Basin, therefore the North American CAMP Basalts postdate the Tr – J boundary whereas part of the Moroccan CAMP was erupted within the Triassic.

According to the fossil record, Lissamphibia, which includes all modern amphibians and is the only surviving lineage, may have branched off from the extinct groups Temnospondyli and Lepospondyli at some period between the Late Carboniferous and the Early Triassic.

The Central Bükk, a gently sloping mountainous area with an altitude between, is situated between Diósgyőr and Lillafüred ; the area is made up of limestone, slate, dolomite and other rocks from the Triassic period.

The Blue Lias consists of a sequence of limestone and shale layers, laid down in latest Triassic and early Jurassic times, between 195 and 200 million years ago.

Cynognathus lived between the Spathian ( Lower Triassic ) and the Anisian ( Middle Triassic ).

As Pangaea drifted during the Triassic, Great Britain moved away from the equator until it was between 20 ° and 30 ° north.

Volcanoes continued to erupt through the Early Triassic on the north – south trending island arc to the west, which was located along what is now the border between California and Nevada.

Also, finds of late Triassic sauropods demonstrate that there is no gap between the " prosauropod " and sauropod lineages.

Karikkoselkä is estimated to be between 230 Ma and 450 Ma ( million years old ), most likely near 240 Ma ( Triassic or earlier ).

The Woodleigh impact event, originally thought to have occurred between the Late Triassic and Late Permian, is now thought to date from 364 ± 8 million years ( Late Devonian ).

It lies on island arc remnants, oceanic plateaus and clustered continental margins that were added along the western margin of North America between the Triassic and Cretaceous periods.

Unaysaurus lived between about 200 to 225 million years ago, in the Carnian or Norian age of the late Triassic period.

Stretching for around between Cardiff and Porthcawl, the remarkable layers of these cliffs, situated on the Bristol Channel are a rhythmic decimetre scale repetition of limestone and mudstone formed as a late Triassic desert was inundated by the sea.

The sandstone was laid down in the Middle Triassic period between 180 and 220 million years ago.

The Guarani Aquifer consists primarily of sedimented sandstones deposited by fluvial and eolian processes during the Triassic and Jurassic periods ( between 200 and 130 million years ago ), with over 90 % of the total area overlaid with basalt of a low-permeability, deposited during the Cretaceous period, acting as an aquitard and providing a high degree of containment.