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Everything You Need To Know To Find The Best What Time Did Dinosaurs Live

Jun. 17, 2024
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The Triassic Period: the rise of the dinosaurs | Natural History Museum

'What we see when we come through into the Triassic is a re-establishment of ecosystems,' says Paul. 'The first few million years of the Triassic is marked by an absence of coals. This is thought to be related to the mass extinction that happened and the time it took for the recovery of plants.'

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This sequence is known as the coal gap, a period in which there was seemingly no coal being laid down. As coal is formed from plant matter that has decayed into peat, it has been suggested that the absence of coal in the first few millions of years of the Triassic was a direct result of the Permian-Triassic extinction event, as plants slowly became re-established in the landscape.

By some estimates, it may have taken up to 10 million years for the planet to recover from the devastation caused by the Great Dying.

The supercontinent Pangea

The Triassic is largely defined by extinctions, but it is also characterised by the position of the continents at that time. There was only one giant landmass: Pangea.

'One might think that because you had this big land mass joined up that the environment across it would be very similar,' says Paul. 'But it's not. There were still quite a lot of differences between the flora in the northern and southern parts.

'Pangea was an extraordinary thing and we haven't seen the like of it since.'

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When did dinosaurs live? | Natural History Museum

Other groups of organisms also diversified. The first snakes evolved during this time, and by the end of the Cretaceous, flowering plants were a much more common part of Earth's plant life.

Various insect groups also appeared, including bees, which helped increase the spread of flowering plants. And mammals now included tree climbers, ground dwellers and even predators of small dinosaurs.

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Sea levels rose and fell repeatedly during the Cretaceous Period. At the highest point there were many shallow seas separating parts of the continents we know today. For example, Europe was made up of many smaller islands. Thick layers of sediment built up at the bottom of these seas as single-celled algae died and their skeletons fell to the seabed.

This is how most of the chalk we use today was first formed. So much so, that 'Cretaceous' comes from the Latin word for chalk, 'creta'.

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