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Paleozoic Era

Evolutionary Timeline Presentation

pilar zuluaga

on 10 April 2012

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Transcript of Paleozoic Era


The Paleozoic or Palaeozoic Era (from the Greek palaios (παλαιός), "old" and zoe (ζωή), "life", meaning "ancient life")
From 543 to 248 Million Years Ago
Cambrian Period
Ordovician Period
Silurian Period
Devonian Period
Carboniferous Period
Permian Period
Cambrian Explosion
Many species evolved hard body parts (shells and outer skeleton)
Many species were fossilized
Land masses moved creating shallow marine habitats
This Period ended with a large mass extinction. 30% of all animal groups died.
542 to 488.3 million years ago
Great 'explosion' of life.
More than 900 species recorded
Trilobites, Brachiopods, Sponges, Bivalves, Gastropods, worms, jellyfish, early Echinoderms, and Arthropods including Crustaceans.
By the middle of the Cambrian period Graptolites appeared, along with Corals and Nautiloids.
Plant life is essentially limited to Algae.
The name Cambrian is derived from Cambria, the ancient Roman name for Wales, where rocks from this period were first studied.
The "rebirth" of life
Oceans flooded and created marine areas
After the Cambrian extinction animals that survived made remarkable changes.
Create diversity in major phyla.
New invertebrates in the sea
Invertebrates evolved some bones
Walking towards land
Land ascend and created tropical areas
Jawless fishes evolved with jaws

Multicellular land plants evolved from marine ones
Arthropods where first land animals
Prosperity of life
Invertebrates and vertebrates prospered in the sea
Fishes with jaws, bones, and scales appeared
Sharks begun to adapt
Some fishes had fins, this later evolved into first amphibians
Land plants adapted to drier places
Insects begun to appear on land
Rising to life on land
Mountains allowed variation of habitats
Swampy forests were created
Amphibians, insects, and land plants adapted
Vertebrates ate insects
Insects showed variety
Vertebrates, invertebrates, and land plants expanded over continents
The Great Extinction
Reptiles experienced adaption that lead to modern reptiles, dinosaurs, and mammals
Biggest mass extinction of life, 70% of terrestrial families, 95% of marine life extinct
488.3 to 443.7 million years ago
443.7 to 416 million years ago
416 to 359.2 million years ago
359.2 to 299 million years ago
299 to 251 million years ago
The majority of Cambrian landmasses were gathered together to form Gondwana
Even though a portion of Gondwana was positioned at or near the South Pole, there is no evidence of glaciation during Cambrian time
By the end of the Paleozoic, continued tectonic plate movements had forced cratons (Earth's crust, continents) together to form the supercontinent of Pangea.
What made it all end
Severe Ice Ages
Continent Pangea formed
Oxygen increased and carbon dioxide levels reached an all-time low
Creating a large surface area which caused extreme temperatures
This climate deterioration near the end of the Paleozoic, may have been the cause of the mass-extinction event that marked the end of the Paleozoic era.
Overall Main Events
“Life on Earth would never again look as it had during the Paleozoic Era.”
Named after a Celtic tribe called the Silures
"Paleozoic Era Paleobiology." Virtual Fossil Museum. N.p., n.d. Web. 5 Sept.
2011. <http://www.fossilmuseum.net/Paleobiology/
Hamilton, Jason. "The Paleozoic Era." Science Views. N.p., n.d. Web. 4 Sept.
2011. <http://www.scienceviews.com/dinosaurs/paleozoic.html>.
Robinson, Richard A., and Rex E. Crick. "Paleozoic Era." Encyclopedia
Britannica. N.p., n.d. Web. 3 Sept. 2011. <http://www.britannica.com/
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