Climate during the Devonian Period

• The Devonian has been regarded as largely warm and equable, with a disastrous drop in temperatures in the Late Devonian leading to the Frasnian-Famennian "mass extinction".
• The climate of the Early Devonian is rather strongly zonal.
• In the Late Devonian, the southern "cool temperate" zone expands, with indications of glacial ice in parts of far western Gondwana (northern South America).
• However, the northern temperate zone appears to retreat before a subtropical zone which extends almost to 60° N.