GSC102 TEST 2 G SILURIAN-DEVONIAN

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7 Terms

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Big-picture snapshot

Greenhouse world, CO₂ much higher than today, Laurussia/Euramerica formed, Late Devonian anoxia, Age of Fishes

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Plant order

  • Non-vascular → early vascular → deeper roots/leaves → trees and forests


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Fish-to-tetrapod order

Eusthenopteron (aquatic lobe-fin) → Tiktaalik (semi-aquatic, neck/wrist-like) → Acanthostega (limbed, mostly aquatic) → Ichthyostega (limbed, better on land)

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Stromatoporoids

Sponge-like reef builders

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Rugose corals

Solitary, horn-shaped

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Tabulate corals

Colonial, honeycomb-like

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Devonian anoxia chain

Forests → deeper roots/weathering → CO₂ removal + nutrient runoff → cooling/productivity → organic matter decays and uses up O₂ → anoxia