What happened during the silurain period?

Answer 1

If by "Silurain" you actually mean Silurian , it refers a time period ranging From 425 million to 405 million years ago; this period extends from the end of the Ordovician ( From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds) Period, to the beginning of the Devonian Period ( From 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites

the Silurian period refers to when, the first air-breathing animals arrived

the Silurian period is also divided into subdivisions

Llandovery

this epoch lasted from 443.7 ± 1.5 million years ago to 428.2 ± 2.3 million years ago, and is further subdivided into three stages:

the Rhuddanian, lasting until 439 million years ago,

the Aeronian, lasting to 436 million years ago, and the Telychian.

The epoch is named for the town of Llandovery in Carmarthenshire, Wales.

WenlockThe Wenlock, which lasted from 428.2 ± 2.3 million years ago to 422.9 ± 2.5 million years ago, is subdivided into:

the Sheinwoodian (to 426.2 million years ago) and,

The Homerian ages.

It is named after the Wenlock Edge in Shropshire, England. During the Wenlock, the oldest known tracheophytes of the genus Cooksonia, appear.

Ludlow

The Ludlow, lasting from 422.9 ± 2.5 million years ago to 418.7 ± 2.7 million years ago, comprises the Gorstian stage, lasting until 421.3 million years ago, and the Ludfordian stage. It is named for the town of Ludlow in Shropshire, England.

Přídolí

The Pridoli, lasting from 418.7 ± 2.7 million years ago to 416 ± 2.8 million years ago, is the final and shortest epoch of the Silurian.

It is named for the town of Přídolí in the Czech Republic.

The Silurian system was first identified by British geologist: Sir Roderick Impey Murchison

References

• Mikulic, DG, DEG Briggs, and J Kluessendorf. 1985. A new exceptionally preserved biota from the Lower Silurian of Wisconsin, USA. Philosophical Transactions of the Royal Society of London, 311B:75-86.
• Moore, RA, DEG Briggs, SJ Braddy, LI Anderson, DG Mikulic, and J Kluessendorf. 2005. A new synziphosurine (Chelicerata: Xiphosura) from the Late Llandovery (Silurian) Waukesha Lagerstatte, Wisconsin, USA. Journal of Paleontology:79(2), pp. 242--250.