Define the Devonian era. Don't copy from google. I know the answer... just want to check knowledge of students.
Answers
Answer:
WHEN THE DEVONIAN period dawned about 416 million years ago the planet was changing its appearance. The great supercontinent of Gondwana was headed steadily northward, away from the South Pole, and a second supercontinent began to form that straddled the Equator. Known as Euramerica, or Laurussia, it was created by the coming together of parts of North America, northern Europe, Russia, and Greenland.
⭐Brainly Quality Answers ⭐
✳Characteristics of Devonian period, geology, Characteristics of Devonian period, geology, climate, fauna, flora:-
☑ Devonian period It was one of the five subdivisions of the Paleozoic era. It lasted for about 56 million years, in which the planet experienced many changes at the geological level, but especially in biodiversity.
During this period, some groups of animals developed extensively, especially those that lived in marine environments. There were also major changes in terrestrial habitats, in which large plants and first terrestrial animals appeared.
✨ The list :-
1 General Features
1.1 Period
1.2 Development of large groups of animals
1.3 Department
1.4 was a process of mass extinction
2 Geology
3 Climate
4 Life
4.1 -Flora
5.References
✔ Common features:-
☑ Period:-
The Devonian period lasted approximately 56 million years. It began about 416 million years ago and ended some 359 million years ago.
⭐ Development of large groups of animals:-
During the Devonian period, pre-existing animal groups experienced an incredible growth and diversification. Life flourished on the seas to a great extent.
Coral reefs became true ecosystems in which new species of sponges and corals appeared. Large animals appeared who became hunters.
☑ Divisions:-
The Devonian period is divided into three major subdivisions:
Low or Early Devonian: corresponding to three storeys or ages (Lochkoviense, Pragiense and Emsiense). Devonian Middle: which spans two eras. Constituted from two eras late or departed (Francians and Feminines).
The mass extinction process was :-
Towards the end of the Devonian period a mass extinction event occurred in which a large number of species were lost, mainly those that inhabited the seas of the tropical part of the planet.
The species most affected by this phenomenon are: coral, fish (especially agnets), molluscs (gastropods, ammonoids), crustaceans (especially ostracodes), others.
Fortunately, species that evolved in terrestrial ecosystems were not affected by this phenomenon, so the conquest of terrestrial habitats could follow its course.
☑ Geology:-
The Devonian period was marked by an intense activity of tectonic plates. A skirmish ensued, creating new supercontinents. This is the case of the formation of Laurecia, an event that occurred at the beginning of this period when Laurentia and Baltica collided.
During this period, the supercontinent Gondwana, very widespread, occupied a large space in the South Pole of the planet. Supercontinent Laurentia was also in the South Pole.
In addition, the last events of the Caledonian orogeny occurred during this period, which led to the formation of mountain ranges in the region where they today reside Great Britain and the Scandinavian countries (especially Norway).
☑ Climate:-
The climatic conditions during the Devonian period were relatively stable. In general, experts point out that the Devonian had a warm and humid climate with abundant rainfall. However, within the large continental mass present on the planet, the climate was dry and arid.
At the beginning of this period, the average environmental temperature was around 30 ° C. As time progressed, it decreased until it reached about 25 ° C.
☑Life:-
During the Devonian period there were significant changes in relation to the creatures inhabiting the planet. The most important of these changes was the definite conquest of terrestrial habitats.
☑Flora:-
During the preceding period, silurion had already started to develop small vascular plants such as ferns. During the Devonian period, these small ferns gained greater development in various aspects, the most representative being their size.
◻ The reference:-
Campbell, N. A. & Rees, J. B. (2007). "Evolutionary History of Biological Diversity". Biology (7th ed.). Editorial Panamericana Medical. P. 1532 Ellwood, BB, SL Benoist, AL El Hasani, Wheeler C, RE Crick (2003), The Impact Ezeka layer from the Mid-Devonian: possible relationships to global mass extinction. Science 300: 1734–1737. Gradstein, F.M. Ogg, J. G.; Smith, A.G. (2004). A Geological Time Scale 2004. Cambridge University Pressesburg, CA, JR Morrow and W Ziegler (2002), Late Devonian C-level changes, catastrophe events, and mass extinction in C Koeberl & KG MacLeod [eds.] Catastrophic Events and Mass Extensions: Impacts and Beyond, Geol. Soak. Amer. Tip. Paper # 356, PP. 473–487. Vargas P., Zardoya R.. (2012) The Tree of Life: Systematic and Evolution of Organisms. third edition.
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