Geologic Time Scale: Devonian Period

(419.2 to 358.9 million years ago)

The Devonian Period (The Age of Fishes) is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land ocurred during the Devonian. An introduction of free-sporing vascular and the first seed-bearing plants appeared by the end of the period. Placoderms began dominating almost every aquatic environment. The ancestors of all four-limbed vertebrates (tetrapods) began adapting to walk on land, as their strong pectoral and pelvic fins gradually evolved into legs.

Famennian Age/Stage

Late Devonian: 371.10 to 359.30 million years ago

The Famennian Stage is the final layer at the end of the Late Devonan Period. The Famennian Stage was named in 1855 by Belgian geologist Andre Hubert Dumont after the Famenne, a natural region in southern Belgium.

North America Famennian Stage Late Devonian: 371.10 to 359.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Dunkleosteus ‭”‬Dunkle’s bone‭”‬
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Dunkleosteidae
Locations: Canada.‭ ‬USA.‭ ‬Europe.‭ ‬Morocco
Time period: Late Devonian (Frasnian to Famennian)
Size: Up to 9‭ ‬meters long
Diet: Carnivore/Piscivore
Genus: Cladoselache“‬Branch toothed shark‭”.
Classification: ‬Order: Symmoriiformes – Family: ‬Cladoselachidae.
Locations: USA.
Time period: Devonian (Fammenian).
Size: Up to 1.8 meters long.
Diet: Carnivore/Piscivore
Genus: Stethacanthus “‬Chest spine‭”
Classification: ‬Order: Symmoriiformes – Family: ‬Stethacanthidae
Locations: China, Europe, North America, Russia
Time period: Late Devonian
Size: 70 centimeters long
Diet: Carnivore
Genus: Helicoprion“‬Spiral saw“‬
Classification: ‬Order: Eugeneodontida – Family: ‬Agassizodontidae.
Locations: Australia, Canada, China, Japan, Mexico, USA.
Time period: Late Devonian to end Triassic.
Size: 7.5 to 3 meters long.
Diet: Carnivore
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore
Genus: Xenacanthus“‬Foreign spike”‬
Classification: ‬Order: Xenacanthida – Family: ‬Xenacanthidae
Locations: USA,‭ ‬Europe, and India
Time period: Late Devonian to end Triassic
Size: Up to 1‭ ‬meters long
Diet: Carnivore
Genus: Acanthostega ‭”‬Spiny roof”
Classification: Class: ‬Amphibia – ‬Subclass: Labyrinthodontia – Order: Ichthyostegalia – Family: Acanthostegidae
Time period: Devonian (Famennian)
Known locations: Eastern Greenland
Size: 60 centimeters long
Diet: Carnivore
Genus: Ichthyostega ‭”‬Fish roof”
Classification: Class: ‬Amphibia – ‬Subclass: Labyrinthodontia – Order: Ichthyostegalia – Family: Ichthyostegidae
Time period: Devonian (Famennian)
Known locations: Eastern Greenland
Size: 1.5 meters long
Diet: Carnivore

European Famennian Stage Late Devonian: 371.10 to 359.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Dunkleosteus ‭”‬Dunkle’s bone‭”‬
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Dunkleosteidae
Locations: Canada.‭ ‬USA.‭ ‬Europe.‭ ‬Morocco
Time period: Late Devonian (Frasnian to Famennian)
Size: Up to 9‭ ‬meters long
Diet: Carnivore/Piscivore
Genus: Stethacanthus “‬Chest spine‭”
Classification: ‬Order: Symmoriiformes – Family: ‬Stethacanthidae
Locations: China, Europe, North America, Russia
Time period: Late Devonian
Size: 70 centimeters long
Diet: Carnivore
Genus: Xenacanthus“‬Foreign spike”‬
Classification: ‬Order: Xenacanthida – Family: ‬Xenacanthidae
Locations: USA,‭ ‬Europe, and India
Time period: Late Devonian to end Triassic
Size: Up to 1‭ ‬meters long
Diet: Carnivore
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore

African Famennian Stage Late Devonian: 371.10 to 359.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Dunkleosteus ‭”‬Dunkle’s bone‭”‬
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Dunkleosteidae
Locations: Canada.‭ ‬USA.‭ ‬Europe.‭ ‬Morocco
Time period: Late Devonian (Frasnian to Famennian)
Size: Up to 9‭ ‬meters long
Diet: Carnivore/Piscivore

South America Famennian Stage Late Devonian: 371.10 to 359.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore

Asia Famennian Stage Late Devonian: 371.10 to 359.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Stethacanthus “‬Chest spine‭”
Classification: ‬Order: Symmoriiformes – Family: ‬Stethacanthidae
Locations: China, Europe, North America, Russia
Time period: Late Devonian
Size: 70 centimeters long
Diet: Carnivore
Genus: Helicoprion“‬Spiral saw“‬
Classification: ‬Order: Eugeneodontida – Family: ‬Agassizodontidae.
Locations: Australia, Canada, China, Japan, Mexico, USA.
Time period: Late Devonian to end Triassic.
Size: 7.5 to 3 meters long.
Diet: Carnivore
Genus: Xenacanthus“‬Foreign spike”‬
Classification: ‬Order: Xenacanthida – Family: ‬Xenacanthidae
Locations: USA,‭ ‬Europe, and India
Time period: Late Devonian to end Triassic
Size: Up to 1‭ ‬meters long
Diet: Carnivore

Australian Famennian Stage Late Devonian: 371.10 to 359.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Helicoprion“‬Spiral saw“‬
Classification: ‬Order: Eugeneodontida – Family: ‬Agassizodontidae.
Locations: Australia, Canada, China, Japan, Mexico, USA.
Time period: Late Devonian to end Triassic.
Size: 7.5 to 3 meters long.
Diet: Carnivore

Frasnian Age/Stage

Late Devonian: 382.70 to 372.20 million years ago

The Frasnian Stage is the first of the Late Devonian Period of the Plaeozoi Era. The Frasnian Stage was named in 1879 by French geologist Jules Gosselet after the village of Frasnes-lez-Couvin in Belgium.

North American Frasnian Stage Late Devonian: 382.70 to 372.20 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Dunkleosteus ‭”‬Dunkle’s bone‭”‬
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Dunkleosteidae
Locations: Canada.‭ ‬USA.‭ ‬Europe.‭ ‬Morocco
Time period: Late Devonian (Frasnian to Famennian)
Size: Up to 9‭ ‬meters long
Diet: Carnivore/Piscivore
Genus: Stethacanthus “‬Chest spine‭”
Classification: ‬Order: Symmoriiformes – Family: ‬Stethacanthidae
Locations: China, Europe, North America, Russia
Time period: Late Devonian
Size: 70 centimeters long
Diet: Carnivore
Genus: Helicoprion“‬Spiral saw“‬
Classification: ‬Order: Eugeneodontida – Family: ‬Agassizodontidae.
Locations: Australia, Canada, China, Japan, Mexico, USA.
Time period: Late Devonian to end Triassic.
Size: 7.5 to 3 meters long.
Diet: Carnivore
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore
Genus: Xenacanthus“‬Foreign spike”‬
Classification: ‬Order: Xenacanthida – Family: ‬Xenacanthidae
Locations: USA,‭ ‬Europe, and India
Time period: Late Devonian to end Triassic
Size: Up to 1‭ ‬meters long
Diet: Carnivore
Genus: Eusthenopteron
Classification: Clade: Sarcopterygii – Clade: ‬Tetrapodomorpha – ‬Order: Osteolepidida – Family: ‬Tristichopteridae
Known locations: Canada,‭ ‬Quebec,‭ ‬Miguasha‭
Time period: Devonian (Givetian to Frasnian)
Size: 1.8‭ ‬meters long
Diet: Carnivore

European Frasnian Stage Late Devonian: 382.70 to 372.20 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Dunkleosteus ‭”‬Dunkle’s bone‭”‬
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Dunkleosteidae
Locations: Canada.‭ ‬USA.‭ ‬Europe.‭ ‬Morocco
Time period: Late Devonian (Frasnian to Famennian)
Size: Up to 9‭ ‬meters long
Diet: Carnivore/Piscivore
Genus: Stethacanthus “‬Chest spine‭”
Classification: ‬Order: Symmoriiformes – Family: ‬Stethacanthidae
Locations: China, Europe, North America, Russia
Time period: Late Devonian
Size: 70 centimeters long
Diet: Carnivore
Genus: Xenacanthus“‬Foreign spike”‬
Classification: ‬Order: Xenacanthida – Family: ‬Xenacanthidae
Locations: USA,‭ ‬Europe, and India
Time period: Late Devonian to end Triassic
Size: Up to 1‭ ‬meters long
Diet: Carnivore
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore

African Frasnian Stage Late Devonian: 382.70 to 372.20 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Dunkleosteus ‭”‬Dunkle’s bone‭”‬
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Dunkleosteidae
Locations: Canada.‭ ‬USA.‭ ‬Europe.‭ ‬Morocco
Time period: Late Devonian (Frasnian to Famennian)
Size: Up to 9‭ ‬meters long
Diet: Carnivore/Piscivore

South American Frasnian Stage Late Devonian: 382.70 to 372.20 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore

Asia Frasnian Stage Late Devonian: 382.70 to 372.20 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Groenlandaspis “Greenland shield”
Classification: Class: ‬Placodermi, – ‬Order: Arthrodira,‭ – Family: Groenlandaspidae
Locations: Global
Time period: Late or Upper Devonian
Size: Up to 9‭ ‬meters long
Diet: Carnivore
Genus: Stethacanthus “‬Chest spine‭”
Classification: ‬Order: Symmoriiformes – Family: ‬Stethacanthidae
Locations: China, Europe, North America, Russia
Time period: Late Devonian
Size: 70 centimeters long
Diet: Carnivore
Genus: Helicoprion“‬Spiral saw“‬
Classification: ‬Order: Eugeneodontida – Family: ‬Agassizodontidae.
Locations: Australia, Canada, China, Japan, Mexico, USA.
Time period: Late Devonian to end Triassic.
Size: 7.5 to 3 meters long.
Diet: Carnivore
Genus: Xenacanthus“‬Foreign spike”‬
Classification: ‬Order: Xenacanthida – Family: ‬Xenacanthidae
Locations: USA,‭ ‬Europe, and India
Time period: Late Devonian to end Triassic
Size: Up to 1‭ ‬meters long
Diet: Carnivore

Australia Frasnian Stage Late Devonian: 382.70 to 372.20 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
Genus: Helicoprion“‬Spiral saw“‬
Classification: ‬Order: Eugeneodontida – Family: ‬Agassizodontidae.
Locations: Australia, Canada, China, Japan, Mexico, USA.
Time period: Late Devonian to end Triassic.
Size: 7.5 to 3 meters long.
Diet: Carnivore

Givetian Age/Stage

Middle Devonian: 387.70 to 382.70 million years ago

The Givetian Stage marks the end of the Middle Devonian Period of the Plaeozoi Era. The Givetian Stage was named in 1879 by French  geologist Jules Gosselet after the town of Givet in France.

North American Givetian Stage Middle Devonian: 387.70 to 382.70 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore
Genus: Eusthenopteron
Classification: Clade: Sarcopterygii – Clade: ‬Tetrapodomorpha – ‬Order: Osteolepidida – Family: ‬Tristichopteridae
Known locations: Canada,‭ ‬Quebec,‭ ‬Miguasha‭
Time period: Devonian (Givetian to Frasnian)
Size: 1.8‭ ‬meters long
Diet: Carnivore

European Givetian Stage Middle Devonian: 387.70 to 382.70 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore

Eifelian Age/Stage

Middle Devonian: 393.3 to 387.70 million years ago

The Eifelian Stage is named after the Eifel Mountains of Western Germany.

North American Eifelian Stage Middle Devonian: 393.3 to 387.70 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore

European Eifelian Stage Middle Devonian: 393.3 to 387.70 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore

Emsian Age/Stage

Early Devonian: 407.60 to 393.30 million years ago

The Emsian Stage marks the end or upper layer of the early Decionian Epoch. The Emsian Stage was named after the Ems river in Germany.

North American Emsian Stage Early Devonian: 407.60 to 393.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: Cephalaspis‭ “Head shield‭”
Classification: Infraphylum: Agnatha – Class: ‬Osteostraci
Size: Approximately‭ ‬20‭ ‬to‭ ‬30‭ ‬centimetres long.
Known locations: Western Europe.‭ ‬North America
Time period: Early Devonian (Lochkovian to Emsian)
Diet: Carnivore/bottom feeder
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore

European Emsian Stage Early Devonian: 407.60 to 393.30 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: Pteraspis ‭”Wing shield‭”
Classification: Infraphylum: Agnatha – Class: Pteraspidomorphi – Subclass: ‬Heterostraci – Order:‭ ‬Pteraspidiformes – Family:‭ ‬Pteraspidae
Known locations: Europe, particularly Belgium and Britain
Time period: Early to Middle Devonian (Lochkovian to Emsian)
Size: 20‭ ‬centimetres long
Diet: Carnivore
Genus: Cephalaspis‭ “Head shield‭”
Classification: Infraphylum: Agnatha – Class: ‬Osteostraci
Size: Approximately‭ ‬20‭ ‬to‭ ‬30‭ ‬centimetres long.
Known locations: Western Europe.‭ ‬North America
Time period: Early Devonian (Lochkovian to Emsian)
Diet: Carnivore/bottom feeder
Genus: OrthacanthusVertical spike“‬.
Classification: Order: Xenacanthida -‭ ‬Family: Orthacanthidae.
Locations: Europe and ‬North America.
Time period: Devonian (Emsian) to Triassic (Carnian).
Size: Up to‭ ‬3‭ ‬meters long.
Diet: Carnivore

Pragian Age/Stage

Early Devonian: 410.80 to 407.60 million years ago

The Pragian Stage is the second of three faunal stages of the Early or lower Devonian Epoch. It is named aftert the city of Prague.

North American Pragian Stage Early Devonian: 410.80 to 407.60 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: Cephalaspis‭ “Head shield‭”
Classification: Infraphylum: Agnatha – Class: ‬Osteostraci
Size: Approximately‭ ‬20‭ ‬to‭ ‬30‭ ‬centimetres long.
Known locations: Western Europe.‭ ‬North America
Time period: Early Devonian (Lochkovian to Emsian)
Diet: Carnivore/bottom feeder

European Pragian Stage Early Devonian: 410.80 to 407.60 million years ago

Common name: Ammonite
Classification: Suborder: Ammonitida – Suborder: Ammonoidae
Locality:
Worldwide
Time range: Devonian to End Cretaceous
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.
Genus: Pteraspis ‭”Wing shield‭”
Classification: Infraphylum: Agnatha – Class: Pteraspidomorphi – Subclass: ‬Heterostraci – Order:‭ ‬Pteraspidiformes – Family:‭ ‬Pteraspidae
Known locations: Europe, particularly Belgium and Britain
Time period: Early to Middle Devonian (Lochkovian to Emsian)
Size: 20‭ ‬centimetres long
Diet: Carnivore
Genus: Cephalaspis‭ “Head shield‭”
Classification: Infraphylum: Agnatha – Class: ‬Osteostraci
Size: Approximately‭ ‬20‭ ‬to‭ ‬30‭ ‬centimetres long.
Known locations: Western Europe.‭ ‬North America
Time period: Early Devonian (Lochkovian to Emsian)
Diet: Carnivore/bottom feeder

Lochkovian Age/Stage

Early Devonian: 419.20 to 410.80 million years ago

The Lochkovian Stage is the first stage of the Early Devonian Epoch. It is named after the village of Lochkov in the Czech Republic, now part of the city of Prague. This stage marks the beginning of the Devonian Period.

North American Lochkovian Age/Stage Early Devonian: 419.20 to 410.80 million years ago

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.
Genus: Cephalaspis‭ “Head shield‭”
Classification: Infraphylum: Agnatha – Class: ‬Osteostraci
Size: Approximately‭ ‬20‭ ‬to‭ ‬30‭ ‬centimetres long.
Known locations: Western Europe.‭ ‬North America
Time period: Early Devonian (Lochkovian to Emsian)
Diet: Carnivore/bottom feeder

European Lochkovian Age/Stage Early Devonian: 419.20 to 410.80 million years ago

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.
Genus: Pteraspis ‭”Wing shield‭”
Classification: Infraphylum: Agnatha – Class: Pteraspidomorphi – Subclass: ‬Heterostraci – Order:‭ ‬Pteraspidiformes – Family:‭ ‬Pteraspidae
Known locations: Europe, particularly Belgium and Britain
Time period: Early to Middle Devonian (Lochkovian to Emsian)
Size: 20‭ ‬centimetres long
Diet: Carnivore
Genus: Cephalaspis‭ “Head shield‭”
Classification: Infraphylum: Agnatha – Class: ‬Osteostraci
Size: Approximately‭ ‬20‭ ‬to‭ ‬30‭ ‬centimetres long.
Known locations: Western Europe.‭ ‬North America
Time period: Early Devonian (Lochkovian to Emsian)
Diet: Carnivore/bottom feeder

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