faunal stage
In chronostratigraphy, a stage is a succession of rock strata laid down in a single age on the geologic timescale, which usually represents millions of years of deposition. A given stage of rock and the corresponding age of time will by conven ...
s in the
Middle Devonian
In the geological timescale, the Middle Devonian epoch (from 393.3 ± 1.2 million years ago to 382.7 ± 1.6 million years ago) occurred during the Devonian period, after the end of the Emsian age.
The Middle Devonian epoch is subdivided into two ...
Period. It lasted from million years ago to million years ago. It was preceded by the
Eifelian
The Eifelian is the first of two faunal stages in the Middle Devonian Epoch. It lasted from 393.3 ± 1.2 million years ago to 387.7 ± 0.8 million years ago. It was preceded by the Emsian Stage and followed by the Givetian Stage.
North American ...
Stage and followed by the
Frasnian
The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Givetian Stage and followed by the Famennian Stage.
Major reef-building was under way during ...
Stage. It is named after the town of
Givet
Givet () (; ) is a commune in the Ardennes department in northern France surrounded on three sides by the Belgian border.
It lies on the river Meuse where Emperor Charles V built the fortress of Charlemont. It borders the French municipali ...
in France. The oldest forests occurred during the late Givetian. The lower
GSSP
A Global Boundary Stratotype Section and Point (GSSP), sometimes referred to as a golden spike, is an internationally agreed upon reference point on a stratigraphic section which defines the lower boundary of a stage on the geologic time scale. ...
Tafilalt
Tafilalt or Tafilet (), historically Sijilmasa, is a region of Morocco, centered on its largest oasis.
Etymology
There are many speculations regarding the origin of the word "Tafilalt", however it is known that Tafilalt is a Berber word meaning ...
, Morocco.
Name and definition
The Givetian Stage was proposed in 1879 by French geologist