The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from 382.31 million years ago to 372.15 million years ago. It was preceded by the Givetian Stage and followed by …

Frasnian Stage, lowermost of the two standard worldwide divisions of Late Devonian rocks and time. Frasnian time occurred between 382.7 million and 372.2 million years ago. The stage’s …

The Frasnian period is defined as a geological time interval characterized by a series of events around the Givetian–Frasnian boundary, marked by significant faunal changes in ammonoids …

晚泥盆世弗拉斯阶—法门阶（Frasnian-Famennian，简称F-F）生物灭绝事件，是显生宙五次全球性生物灭绝事件之一。 对于造成此次重大生物危机的原因还存在许多争论。

弗拉斯阶（Frasnian Stage）现为国际地层表中上泥盆统下部的一个阶，位于 吉维阶 之上， 法门阶 以下，以产菊石Manticoceras为其特征。 弗拉斯阶一名源自比利时的弗拉斯（Frasne）。 …

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 …

1999年5月31日 · The Frasnian epoch saw the evolution of quite distinct, and short-lived, goniatite groups belonging to the Gephuroceratacea, and Pharcicerataceae, which are united by the …

2018年5月8日 · Frasnian A stage of the Devonian Period, about 385.3–374.5 Ma ago) that is noted for the culmination of the first major radiation of the single-celled Foraminiferida. The …

There are three important extinctions in latter half of the Devonian Period, each separated by about 10 million years. Only one of these, at the end of a time interval called the Frasnian, is …

2006年3月7日 · The name Frasnian, which comes from the locality of Frasnes near Couvin in Belgium, was introduced by Gosselet in 1879 and was formally retained for the lower stage of …