Geologic Time Scale: Silurian Period

(443.8 to 419.2 million years ago)

The Silurian Period was first identified by British geologist Roderick Murchison, who was examining fossil-bearing sedimentary rock starta (layers) in south Wales in the early 1830s. He named the sequences for a Celtic tribe of Wales, the Silures, inspired by his friend Adam Sedgwick, who had named the period of his study the Cambrian, from the Latin name for Wales.

About 60% of marine genera were wiped out in the Ordovician-Silurian extinction events. The “Silurian-Devonian Terrestrial Revolution” includes the emergence of vascular plants, fungi, and arthropods (arachnids, myriapods, and hexapods) became fuly terrestrial.

Pridoli Epoch

Late Silurian: 423.0 to 419.2 million years ago

The Pridoli Epoch is the uppermost or end of the Late Silurian Period. It was named after the area Pridoli area of the Deleje Valley on the outskirts of Prague in the Czech Republic.

European Pridoli Epoch Late Silurian: 423.0 to 419.2 million years ago

Name: Eurypterus ‭”wide wing‭”‬.
Classification: Eurypterida,‭ ‬Eurypteroidea,‭ ‬Eurypteridae.
Locality: Eastern Canada and the United States.‭ ‬Across Europe.
Time period: Silurian (Late Llandovery to Pridoli).
Size: 13‭ ‬centimeters to‭ ‬1.3‭ ‬meters long.‭
Diet: 
Carnivore.
Name: Pterygotus “finned one or wing animal”.
Classification: Order: Eurypterida – Superfamily: Pterygotioidea – Family: Pterygotidae.
Locality: Middle Silurian in Europe (British Isles) and Devonian in North America. 
Time period: Silurian to mid Devonian.
Large individuals up to 1.75 meters long.
Diet: Carnivore.

Ludfordian Age/Stage

Ludlow: 423.0 to 419.2 million years ago

The Ludfordian Stage is named after the village of Ludford in Shropshire, England. It marks he end of he upper Ludlow Epoch.

European Ludfordian Stage Ludlow: 423.0 to 419.2 million years ago

Name: Eurypterus ‭”wide wing‭”‬.
Classification: Eurypterida,‭ ‬Eurypteroidea,‭ ‬Eurypteridae.
Locality: Eastern Canada and the United States.‭ ‬Across Europe.
Time period: Silurian (Late Llandovery to Pridoli).
Size: 13‭ ‬centimeters to‭ ‬1.3‭ ‬meters long.‭
Diet: 
Carnivore.
Name: Pterygotus “finned one or wing animal”.
Classification: Order: Eurypterida – Superfamily: Pterygotioidea – Family: Pterygotidae.
Locality: Middle Silurian in Europe (British Isles) and Devonian in North America. 
Time period: Silurian to mid Devonian.
Large individuals up to 1.75 meters long.
Diet: Carnivore.

Gorstian Age/Stage

Ludlow: 427.4 to 425.6 million years ago

The Gorstian Stage of lower Ludlow Epoch was named after the Gorsty village southwest of Ludlow.

European Gorstian Stage Ludlow: 427.4 to 425.6 million years ago

Name: Eurypterus ‭”wide wing‭”‬.
Classification: Eurypterida,‭ ‬Eurypteroidea,‭ ‬Eurypteridae.
Locality: Eastern Canada and the United States.‭ ‬Across Europe.
Time period: Silurian (Late Llandovery to Pridoli).
Size: 13‭ ‬centimeters to‭ ‬1.3‭ ‬meters long.‭
Diet: 
Carnivore.
Name: Pterygotus “finned one or wing animal”.
Classification: Order: Eurypterida – Superfamily: Pterygotioidea – Family: Pterygotidae.
Locality: Middle Silurian in Europe (British Isles) and Devonian in North America. 
Time period: Silurian to mid Devonian.
Large individuals up to 1.75 meters long.
Diet: Carnivore.

Homerian Age/Stage

Wenlock: 430.5 to 427.4 million years ago

The Homerian Stage of the Wenlock Epoch of the Silurian Period of the Paleozoic Era. It is named after the village of Homer, Shropshire near Much Wenlock in England.

Euroean Homerian Stage Wenlock: 430.5 to 427.4 million years ago

Name: Eurypterus ‭”wide wing‭”‬.
Classification: Eurypterida,‭ ‬Eurypteroidea,‭ ‬Eurypteridae.
Locality: Eastern Canada and the United States.‭ ‬Across Europe.
Time period: Silurian (Late Llandovery to Pridoli).
Size: 13‭ ‬centimeters to‭ ‬1.3‭ ‬meters long.‭
Diet: 
Carnivore.
Name: Pterygotus “finned one or wing animal”.
Classification: Order: Eurypterida – Superfamily: Pterygotioidea – Family: Pterygotidae.
Locality: Middle Silurian in Europe (British Isles) and Devonian in North America. 
Time period: Silurian to mid Devonian.
Large individuals up to 1.75 meters long.
Diet: Carnivore.

Sheinowoodian Age/Stage

Wenlock: 433.4 to 430.5 million years ago

The Sheinwoodian Stage of the lower Wenlock Epoch was named after the Sheinwood village, north of Much Wenlock, United Kingdom.

European Sheinowoodian Stage Wenlock: 433.4 to 430.5 million years ago

Name: Eurypterus ‭”wide wing‭”‬.
Classification: Eurypterida,‭ ‬Eurypteroidea,‭ ‬Eurypteridae.
Locality: Eastern Canada and the United States.‭ ‬Across Europe.
Time period: Silurian (Late Llandovery to Pridoli).
Size: 13‭ ‬centimeters to‭ ‬1.3‭ ‬meters long.‭
Diet: 
Carnivore.
Name: Pterygotus “finned one or wing animal”.
Classification: Order: Eurypterida – Superfamily: Pterygotioidea – Family: Pterygotidae.
Locality: Middle Silurian in Europe (British Isles) and Devonian in North America. 
Time period: Silurian to mid Devonian.
Large individuals up to 1.75 meters long.
Diet: Carnivore.

Telychian Age/Stage

Llandovery: 438.5 to 433.4 million years ago

The Telychian Stage of the Llandovery Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon. The Telychian the Pen-lan-Telych Farm near Llandovery, Powys, Wales.

European Telychian Stage Llandovery: 438.5 to 433.4 million years ago

Name: Eurypterus ‭”wide wing‭”‬.
Classification: Eurypterida,‭ ‬Eurypteroidea,‭ ‬Eurypteridae.
Locality: Eastern Canada and the United States.‭ ‬Across Europe.
Time period: Silurian (Late Llandovery to Pridoli).
Size: 13‭ ‬centimeters to‭ ‬1.3‭ ‬meters long.‭
Diet: 
Carnivore.

Aeronian Age/Stage

Llandovery: 440.8 to 438.5 million years ago

The Aeronian Stage is the middle age of the Liandovery Epoch.

Rhuddanian Age/Stage

Llandovery: 443.8 to 440.8 million years ago

The Rhuddanian Stage is the first age of the Silurian Period and Llandovery Epoch.

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