Devonian period


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Devonian period

The fourth period of the Paleozoic era: 408 to 360 million years ago.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Devonian period - from 405 million to 345 million years agoDevonian period - from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
Paleozoic, Paleozoic era - from 544 million to about 230 million years ago
References in periodicals archive ?
Until recently, scientists believed that the first trees appeared in the middle of the Devonian period, some 400 million years ago.
They date back to the Devonian Period, known for being the era in which the first land-dwelling vertebrates called tetrapods, a group of four-limbed amphibians, evolved on Earth.
The stones are between 354 and 417 million years old and are traced back to the Upper Devonian Period.
The oldest chondrichthyan from the Early Devonian period.
The basement rocks (Franklinian), as in most of northern Alaska, are composed of meta-sedimentary rocks dating to the Devonian period.
The UK shales were formed in the carboniferous period over 300 million years ago, while those in the US were formed over 400 million years ago in the Devonian period.
One exploratory well was drilled in 2015, leading to a commercial discovery with a tested flow rate of 60 barrels of oil per day over a period of 18 hours from within deposits of the Devonian period.
This also casts a new light on the terrestrialization processes at the beginning of the Devonian period (Retallack 2011) and makes a new contribution to the general knowledge in this field.
Most of the fossils at this park were from creatures of the Devonian Period, which is thought to be even before the time of dinosaurs.
The research team, which includes Assistant Professor Sarah Carmichael, is examining the relationship between climate change and changes in the ecosystems in the Devonian period, from 419 to 359 million years ago.
Terrestrialisation was believed to have occurred early in their history, probably during the Devonian period, with allegedly aquatic Proscorpiidae coexisting with terrestrial Mesoscorpionina and 'palaeosterns' until the early Carboniferous (Jeram 1998).