Frasnian Stage

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Frasnian Stage

the lower stage of the Upper Devonian. The Frasnian stage was identified by the Belgian geologist J. Omalius d’Halloy in 1862. At the type locality, the stage is represented by coral-reef and other limestones and by clay shales. The stage is distinguished on the basis of brachiopods, ammo-noids, and other fossils. It is divided into three (in some places, two) substages and from two to five zones. In the USSR, limestones and shales—including bituminous shales containing ammonoids and tentaculites (domanic sediments)—predominate in the Frasnian stage. In addition, brightly colored continental deposits and volcanic rocks are widespread. In many basins, the rock sequence corresponds to a marine transgression. (SeeDEVONIAN SYSTEM [PERIOD].)

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No references found			The die-off climaxed at the end of the period's Frasnian stage, which lasted from around 385 million to 375 million years ago. New fossils threaten an extinction theory by Harder, B. / Science News All of the rediscovered bones originally came from a Scottish site dating back to the Frasnian stage of the late Devonian period, about 370 million years ago. Forgotten fossils reveal leggy legacy by Monastersky, Richard / Science News			Franzensbad Franzholi, Andrei Franzholi, Andrei Afanasevich Fraps Frary metal Frascati Frasch Process Frasch, Herman Frasconi, Antonio Fraser Fraser River Fraser's air-sand process Fraser, Bruce Austin Fraser, Dawn Fraser, Douglas Fraser, Douglas Andrew Fraser, George MacDonald Fraser, Gretchen Fraser, James Earle Fraser, Malcolm Fraser, Peter Fraser, Simon Fraserburgh Frasheri, Naim Frashëri, Naim Frasnian Stage Frasquita frass Fratellini family frater Fratercula fraternal Fraternal Democrats fraternal orders fraternal twins Fraternal Union of Prisoners of War BSV fraternity fraternity and sorority fraternity house fraud Fraude's reagent Frauds, Statute of Fraudulence Frauenfeld Fraunces, Samuel fraunhofer Fraunhofer corona Fraunhofer diffraction Fraunhofer Gesellschaft Fraunhofer Lines Fraunhofer region			Fraser's syndrome Fraser, (John) Malcolm Fraser, (John) Malcolm Fraser, Bruce Austin Fraser, Dawn Fraser, Dawn Fraser, Douglas Fraser, Douglas Andrew Fraser, George MacDonald Fraser, Gretchen Fraser, James Earle Fraser, Malcolm Fraser, Peter Fraser, Simon Fraser-Burrard Community Justice Society Frasera Frasera Frasera speciosa Fraserburgh Fraserburgh Fraserside Community Services Society Frasheri, Naim Frashëri, Naim FRASI Frasier Fir Hand Wash FRASM Frasnian Frasnian Stage FRASNZ FRASPL Frasquita frass frass frass Frass valley frat frat frat house FRATC fratch Fratelli Dell'Uomo Fratellini Family Frater Frater Frater Frater house Fratercula Fratercula Fratercula Fratercula arctica Fratercula arctica Fratercula arctica Fratercula cirrhata Fratercula cirrhata Fratercula corniculata Fratercula corniculata Fratercula corniculata fraternal

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