How much of Earth was covered by ocean during the Devonian Period?

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Devonian paleogeography — Devonian Period Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the early Devonian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.

During the Devonian Period, approximately 85 percent of the Earth's surface was covered by ocean.12

While large landmasses such as Laurussia and Gondwana existed, significant portions of these continents—particularly the southern regions of Laurussia—were frequently submerged under shallow continental shelf seas. The global climate during this time is generally considered to have been warm and equitable, with limited evidence of polar ice caps.231