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The Devonian (/ d ə ˈ v oʊ n i. ən, d ɛ-/ də-VOH-nee-ən, deh-) [9] [10] is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at 419.62 million years ago (), to the beginning of the succeeding Carboniferous period at 358.86 Ma.
Glass sponges became abundant in western New York during the Devonian. [23] Especially notable are the marine fossils of Cuyahoga County, Ohio, which was home to more than 120 kinds of marine life. The local fishes alone left behind more than 50,000 fossils. [24] During the Late Devonian the oldest known seed-bearing
The Devonian (/ d ə ˈ v oʊ n i. ən, d ɛ-/ də-VOH-nee-ən, deh-) is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at 419.62 million years ago (), to the beginning of the succeeding Carboniferous period at 358.86 Ma.
The Early Devonian is the first of three epochs comprising the Devonian period, corresponding to the Lower Devonian series. It lasted from 419.62 ± 1.36 to 393.47 ± 0.99 and began with the Lochkovian Stage 419.62 ± 1.36 to 413.02 ± 0.99 , which was followed by the Pragian from 413.02 ± 1.36 to 410.62 ± 0.99 and then by the Emsian , which ...
The term primarily refers to a major extinction, the Kellwasser event, also known as the Frasnian-Famennian extinction, [1] which occurred around 372 million years ago, at the boundary between the Frasnian age and the Famennian age, the last age in the Devonian Period. [2] [3] [4] Overall, 19% of all families and 50% of all genera became ...
A shell midden at Enterprise, Florida in 1875.. The foundation of Florida was located in the continent of Gondwana at the South Pole 650 million years ago (Mya). When Gondwana collided with the continent of Laurentia 300 Mya, it had moved further north. 200 Mya, the merged continents containing what would be Florida, had moved north of the equator.
The Silurian-Devonian Terrestrial Revolution, also known as the Devonian Plant Explosion (DePE) [1] and the Devonian explosion, was a period of rapid colonization, diversification and radiation of land plants and fungi on dry lands that occurred 428 to 359 million years ago (Mya) during the Silurian and Devonian periods, [2] [3] [4] with the ...
This timeline of Devonian research is a chronological listing of events in the history of geology and paleontology focused on the study of earth during the span of time lasting from 419.2 to 358.9 million years ago and the legacies of this period in the rock and fossil records.