Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap

  title={Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap},
  author={Timothy R. Smithson and S. P. Wood and John E. A. Marshall and Jennifer Alice Clack},
  journal={Proceedings of the National Academy of Sciences},
  pages={4532 - 4537}
Devonian tetrapods (limbed vertebrates), known from an increasingly large number of localities, have been shown to be mainly aquatic with many primitive features. In contrast, the post-Devonian record is marked by an Early Mississippian temporal gap ranging from the earliest Carboniferous (Tournaisian and early Viséan) to the mid-Viséan. By the mid-Viséan, tetrapods had become effectively terrestrial as attested by the presence of stem amniotes, developed an essentially modern aspect, and given… 

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