Remember, our journey began in the Ediacaran, the third and final period of the Neoproterozoic and therefore the Precambrian.
Since then, we have come a long way through time, spanning many millions of years. We began the Paleozoic with the Cambrian, then moved to the Ordovician, which succeeded it.
Now is the time to learn more about the Silurian. This third stage in the history of the Paleozoic promises to be just as rich in discoveries.
Unlike its predecessors, the Silurian period is relatively short – around 25 million years. In fact, it is the shortest of all the Paleozoic eras. Other eras, such as the Cambrian, lasted almost 56 million years, and the Ordovician, the period before the Silurian, lasted almost 42 million years. The Devonian that followed lasted almost 57 million years.
If geologists have differentiated the Silurian period from the Ordovician and the Devonian, it is because it is sufficiently singular for it to be so. And that's exactly what we're going to discover on this trip.
The Silurian is a pivotal period in our history, marked by numerous changes in flora and fauna.
During our trip to the Cambrian lands, we witnessed what scientists call the explosion of life on earth. During the Ordovician period, the radiation of organisms was just as rich, allowing many species to develop and diversify.
In biology, radiations are the adaptation of an animal or plant lineage to a new living environment, leading to changes that facilitate their activities. This is sometimes called adaptive radiation or evolutionary radiation.
If the Cambrian and Ordovician periods were pivotal in terms of influence, they were far from being the only ones.
The Silurian, on the other hand, was a crucial period for life on our planet. This is the period which forever marks the face of the Earth, with the arrival of the first terrestrial organisms.
What was the Earth like at this time in our history? How are our continents and oceans defined? What living beings inhabited the oceans? How has life evolved? Why did she begin her conquest of the earth precisely at this time?
As a reminder, the videos are published on SUNDAY at 6 p.m.
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The Great Epic of the Silurian and its Giant Scorpions:
– The name of this geological era comes from the Silurian Celtic tribe who lived in south Wales, a region where traces of this period have been discovered.
As mentioned in the introduction, the Silurian is a small period spanning approximately 25 million years. It started about 443 million years ago and ended about 418 million years ago. This period, third stage of the Paleozoic, is itself subdivided into four series marked by different events that geologists have defined as follows:
The first, known as the Llandovery or Llandoverian, began 443 million years ago and ended around 433, followed by the Wenlock or Wenlockian until 427, then the Ludlow or Ludlowian until 423, and finally the Pridoli or Pridolian, which closes the period between 423 and 419 or 416 million years ago, according to estimates.
During the Silurian, articulated brachiopods diversified considerably. Unlike inarticulates, the shells of articulated brachiopods remain fused even after the animal dies. Articulation is made possible by the presence of teeth on one valve, the peduncular valve, and dimples of complementary shapes on the other valve.
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Today's program:
– 00:00 – Presentation
– 04:50 – WHAT WAS THE EARTH LIKE IN SILURIAN PERIOD?
– 17:02 – WHAT DOES THE SILURIAN WILDLIFE LOOK LIKE?
– 7:55 p.m. – The basics of the Silurian marine ecosystem
– 9:30 p.m. – Graptolites
– 26:47 – Nautiloids
– 33:07 – Brachiopods
– 38:46 – Crinoids
– 41:16 – Giant scorpions!
– 48h00 – The incredible diversification of fish
– 50:03 – Ostracoderms
– 51:39 – Anapsids
– 53:12 – Telodonts
– 53:45 – Heterostracae
– 56:34 – Galeaspides
– 57:09 – Gnathostomes
– 58h30 – Placoderm fish
– 01:04:15 – Conodonts
– 01:06:42 – What did our planet look like on earth?
– 01:10:20 – What did the first plants on Earth look like?
– 01:13:00 – Silurian terrestrial flora and fauna
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