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Mesozoic Era

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kelsey hartnett

on 14 October 2014

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Transcript of Mesozoic Era

The Mesozoic Era is subdivided into three major periods...
Triassic 250-205 M.Y.A.
Jurassic 205-135 M.Y.A.
Cretaceous 135-65 M.Y.A.
The climate was generally dry. There was a low sea level during this time period
The sea level started to rise, probably caused by increase in seafloor spreading. Temperatures continued to increase, as well as humidity.
Temperature stayed the same across the planet. Temperatures were generally higher than today's temperatures by 10 degrees Celsius.
The end of period was parked with another major mass extinction wiping out many groups and allowing dinosaurs to assume dominance in the Jurassic period. It may have been the climate change, or that there was a release of CO2 from volcanic eruptions that warmed up global temperatures and also the ocean, or perhaps a fatal run-in with a comet or asteroid.
240 million years ago
220 million years ago
200 million years ago
170 million years ago
150 million years ago

120 million years ago
250-205 M.Y.A.
94 million years ago
Plate Tectonics
105 million years ago
Mid-Atlantic Ridge
Split apart the continents
New oceans formed (Atlantic)
No evidence of glaciation at or near either poles.Very hot summers, very cold winters.
What is the K-T boundary? K is actually the traditional abbreviation for the Cretaceous period, and T is the abbreviation for the Tertiary period. So the K-T boundary is the point in between the Cretaceous and Tertiary periods. Geologists have dated this period to about 65.5 million years ago.
Permian-Triassic extinction event, 90% to 96% of marine species and 70% of terrestrial vertebrates became extinct. This event was called the "Great Dying" considered the largest mass extinction in the Earth's history.
= Mid-Atlantic Ridge
The Jurassic time period was known for ushered birds and mammals. First birds appeared, having evolved from a branch of dinosaurs.
205-135 M.Y.A.

In the Jurassic time preiod, the supercontinent Pangea began to break apart. (this is a theory) This created two landmasses.
Beginning of a bloom of conifers.
One theory of why the Jurassic Period ended was because of the release of huge methane deposits from within the Earth.
At the start of the Mesozoic Era, the continents of the Earth were jammed together into the supercontinent of Pangaea; this land mass had a hot, dry interior with many deserts. The polar regions were moist and temperate
Mesozoic Era
250-65 M.Y.A.
Time when the enormous sauropods lived.
Conifers were the dominant land plant during this period. Flowering plants developed in the late Jurassic.
By: Mya and Kelsey
There was no polar ice during the last two-thirds of the Jurassic. The climate was warm and moist and the sea levels high. There were vast flooded areas, temperate and subtropical forests, and coral reefs. The extensive water moderated the strong seasonality
The cretaceous was third of three periods in the mesozoic era.
Volcanoes, asteroids ( Chicxulub Crater), and climate change were causes of the multiple extinctions in plants and animals.
Chicxulub Crater and K-T Boundary
Without plants, there would have been no dinosaurs (or any other land animals).
Dinosaurs still dominated the time period.
This period was known for iconic dinosaurs.
K-T event brought Cretaceous period to an end.
135-65 M.Y.A.
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