and Tectonics during the Devonian
the Devonian, there were two supercontinents, Gondwana
and Euramerica, located relatively close to each other
in the Southern Hemisphere. A vast ocean covered the rest of the globe,
and the land was comparatively arid. Global climate was relatively warm and dry, and there was less of an equator-to-pole temperature gradient than today.
There were no glaciers until the Late Devonian, when ice began to cover parts of the South Polar region.
In the north, the formation of the continent of Euramerica continued
from the Silurian. The northern branch of the Iapetus Ocean closed
and the Late Caledonian (or Acadian) orogeny continued. The Euramerican
continent, once called the “Old Red Continent” because
of the color of Devonian-age rocks in Europe and North America, began
to drift northward. Gondwana also drifted north. The formation of
Euramerica and the closure of the oceans between Euramerica and Gondwana
initiated the formation of Pangea, which continued into the early