Devonian period

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Devonian period

a geological period lasting from about 415 to 370 million years ago. Many freshwater fish existed during this period and plants became established on land. True seed plants evolved and lycopods reached the size of trees. Amphibians evolved, the first known insects, spiders and mites occurred and most graptolites became extinct. Britain still lay south of the equator with the Thames at 10 °S. See GEOLOGICAL TIME.
References in periodicals archive ?
Webster (2012) considers that Crotalocrinites bashkiricus described by Yakovlev (1949) from the Lower Devonian of Bashkortostan represents a new genus, intermediate between Crotalocrinites and Pernerocrinus.
The Bank has unique knowledge of, and relationships in Mongolia and has provided finance to assist the development of the two existing economic copper projects in the Devonian belt.
Jones (2011) described examples of superficially similar traces from the Devonian Catskill Formation of Pennsylvania.
Apart from finds in Jordan, a Devonian light oil discovery made in the 1980s in southern Turkey is said to be sourced by these shales.
In the Devonian period, Waters explained, the world was experiencing super greenhouse climate conditions.
Palaeoscorpius devonicus Lehmann, 1944 from the Lower Devonian Hunsruck Slate Lagerstatte in Germany has also been re-investigated (Kuhl et al.
The authors, basing an interpretation solely on the size and shape of the grains in those shale clasts, suggest that the clasts belong to the Upper Devonian Ohio Shale or Lower Mississippian sandstones of the Cuyahoga Series.
In regional scale, the rocks of the Middle Devonian Narva Regional Stage are widespread in the East European Platform.
Tectonic and karst phenomena were major factors to influence the occurrence of ore bodies, which are present not only in Triassic sediments, but also within Devonian rocks (Cabala, 2002; Kurek, 1993).
At the Devonian dinner, Shackleton and the other guests dined on turbot dieppoise, tomato with tapioca, Kirsch sorbet and glace plombiere--a far cry from the seal, penguin and pemmican that sustained his crew during their ordeal in Antarctica.
Exposures of the Middle Devonian Bell Shale at the abandoned Kelley's Island Lime and Transport Company Quarry near Rockport, Michigan, contain a moderately diverse and well-preserved invertebrate faunal assemblage.
The extinction during the Late Devonian period is widely considered one of the five massive extinctions in Earth's prehistory.