The Devonian Period The Era of Fishes

Came between the Silurian time period and the Carboniferous time period

Spanning 60 million years from the end of the Silurian to the beginning of the Carboniferous

  • Water was hot, around 86 degrees farinheit
  • Only 126 degrees away from boiling temperature all the time
  • Climate was relatively warm and dry


Human height converted to 5' 10"
  • Vegetation grew 10 feet into the sky, giant sharks around 30 feet grew in the ocean
Animation of what these giant sharks could have looked like

The Coelacanth

Coelacanths (See la canths)- still alive today, developed in Devonian

Has survived since the Devonian period through many mass extinctions

Other fish

  • Fossils of other giant beasts have been found to give us a better idea of what some of these creatures looked like
  • Drawings can be guessed at what they would have looked like years ago
  • Sea Scorpions could be 2 1/2 meters in length
Dunkleosteus fossil


  • Early insects evolved (first winged insects and arachnids)
  • The first tetrapods {first vertebrates(animals with backbones)
  • Seas dominated by invertebrates with shells and coral
One of the first insects were Dragonflys
  • Beginning of Devonian were jawless fish
  • Middle of Devonian were first jawed fish
Fossil of a jaw-less fish from the begging of the era
  • Most Trilobites died out by the end
  • Placoderms - sharks ancestors
  • Osteichthyes (Os-t-ic-thees)- ancestors to amphibians


  • ¾ of all species died
  • May have been a series of extinctions over millions of years.
  • Shallow seas were worst affected
  • No oxygen in sea bed so only bacteria could survive
  • Sea level changing, asteroid impacts, climate change, and plants have been blamed
Reefs didn’t come back until new species evolved 100 million years later


  • Bizley, Richard. “BBC Nature - Devonian Period Videos, News and Facts.” BBC News, BBC, Oct. 2014, Accessed 20 Mar. 2017.
  • Bizley, Richard. “BBC Nature - Late Devonian Mass Extinction Videos, News and Facts.” BBC News, BBC, Oct. 2014, Accessed 20 Mar. 2017.
  • Blitman, Andrew. “Sharks of the Devonian.” RSMAS Blog, University of Miami, 14 Sept. 2012, Accessed 17 Mar. 2017.
  • British Geological Survey 1998 - 2016 (c)NERC, Gradstein. “Devonian.” Devonian | Phanerozoic, NERC, 2012, Accessed 17 Mar. 2017.
  • “Creature Ideas. Crustaceans.” Unknown Worlds Forums, Accessed 20 Mar. 2017.
  • “DUNKLEOSTEUS.” Emaze Presentations, Accessed 20 Mar. 2017.
  • Museum, New Brunswick. “Randall Miller and Giant Sea Scorpions.” People | Devonian |, 1 Aug. 2013, Accessed 20 Mar. 2017.
  • Sarfati, Jonathan. “Geologic System.” Geologic System - Conservapedia, 16 July 2016, Accessed 20 Mar. 2017.
  • “Seres Do Mar.” Pinterest, Accessed 20 Mar. 2017.
  • Speer, Brian R. “The Devonian Period.” The Devonian Period, Biology 1b Project, Nov. 2002, Accessed 17 Mar. 2017.


Created with images by James St. John - "Diplacanthus striatus fossil fish (Lower Devonian; Scotland)" • Todd Huffman - "Coelacanth" • sybarite48 - "Coelacanthe" • Erica Annie - "Grey Blue Dragon" • James St. John - "Cyrtaspidichthys sculptus fossil fish (Beartooth Butte Formation, Lower Devonian; Beartooth Butte, Beartooth Mountains, Wyoming, USA) 2" • jeanseyes - "Trilobites" • edenpictures - "Dunkleosteus" • James St. John - "Gonatodus brainerdi fossil fish (Berea Sandstone, lowermost Mississippian); quarry in Chagrin Falls, Cuyahoga County, northeastern Ohio, USA) 2" • N Stjerna - "Fish" • Francis Vallance (Heritage Warrior) - "Opuha Dam" • prilfish - "Dead Corals"

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