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21-Sep-2019 18:51

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We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services.To learn more or modify/prevent the use of cookies, see our Cookie Policy and Privacy Policy.Forests and the coiled shell-bearing marine organisms known as ammonites first appeared early in the Devonian.Late in the period the first four-legged amphibians appeared, indicating the colonization of land by vertebrates. This union of the paleocontinents of Laurentia (comprising much of North America, Greenland, northwestern Ireland, Scotland, and the Chukotsk Peninsula of northeastern Russia) and Baltica (now most of northern Europe and Scandinavia) occurred near the beginning of the Devonian Period.Devonian Period, in geologic time, an interval of the Paleozoic Era that follows the Silurian Period and precedes the Carboniferous Period, spanning between about 419.2 million and 358.9 million years ago.The Devonian Period is sometimes called the “Age of Fishes” because of the diverse, abundant, and, in some cases, bizarre types of these creatures that swam Devonian seas.

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Though Laurussia was essentially tropical or subtropical, its climatic zones changed somewhat through the course of the Devonian as this landmass migrated northward during Late Devonian and Early Carboniferous times.

Evidence for this movement includes the reduction in evaporitic environments in western Canada and the onset of humid and moist conditions in the area of New York.

The oceans experienced episodes of reduced dissolved oxygen levels, which likely caused the extinction of many species, especially marine animals.

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These extinctions were followed by periods of species diversification, as the descendants of surviving organisms filled in abandoned habitats.corals from Torquay in Devon seemed intermediate in type between those of the Silurian System below and those of the Lower Carboniferous System above.The correlations discussed demonstrate the utility of the gamma-ray log for regional, basinwide stratigraphic studies.



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