Givetian Stage


Givetian Stage

      uppermost of the two standard worldwide divisions of Middle Devonian (Devonian Period) rocks and time. Givetian time spans the interval between 391.8 million and 385.3 million years ago. It was named for exposures studied near Givet in the Ardennes region of northern France and is characterized by a zone (a smaller subdivision of geologic time) whose rocks include the ammonite (ammonoid) genus Maenioceras.

      In the Ardennes, limestones (limestone) predominate and form escarpments about the town of Givet. Their rich fossil invertebrate fauna is characterized by the coral genus Favosites as well as gastropods (gastropod) and brachiopods (lamp shells) (lamp shells). Important Givetian sections also occur in Great Britain, where limestones and gray, slaty goniatite-bearing rocks predominate; in Germany and Russia, where limestones and shales include fossils of the widely distributed brachiopod genus Stringocephalus; in northeastern North America, where the richly fossiliferous limestones and shales include the upper formations of the Hamilton Group; and in Australia. As formally ratified in 1994 under the authority of the International Commission on Stratigraphy, the Global Stratotype Section and Point (GSSP) identifying the lower boundary of this stage is located at Jebel Mech Irdane ridge, 12 km (about 7 miles) southwest of Rissani, Morocco. The Givetian Stage is overlain by the Frasnian Stage of the Upper Devonian Series and underlain by the Eifelian Stage of the Middle Devonian Series.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Eifelian Stage — ▪ geology       lowermost of the two standard worldwide divisions of Middle Devonian (Devonian Period) rocks and time. Eifelian time spans the interval between 397.5 million and 391.8 million years ago. The name of the Eifelian Stage is derived… …   Universalium

  • Frasnian Stage — ▪ paleontology       lowermost of the two standard worldwide divisions of Late Devonian (Devonian Period) rocks and time. Frasnian time occurred between 385.3 million and 374.5 million years ago. The stage s name is derived from the town of… …   Universalium

  • Oxfordian (stage) — System Series Stage Age (Ma) Cretaceous Lower Berriasian younger Jurassic Upper Tith …   Wikipedia

  • Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… …   Universalium

  • New Zealand geologic time scale — While also using the international Geologic time scale, many nations especially those with isolated and therefore non standard prehistories use their own system of dividing geologic time into epochs and faunal stages. In New Zealand, these epochs …   Wikipedia

  • Onondaga (geological formation) — The Onondaga Formation is a group of hard limestones and dolostones of Devonian age that form an important geographic feature in the area of outcrop.In upstate New York and southern Ontario the sedimentary rocks tend to slope slightly to the… …   Wikipedia

  • Notorhizodon — Temporal range: Devonian Scientific classification Kingdom: Animalia Phylum: Chordata Subphylum …   Wikipedia

  • Givetium — System Serie Stufe ≈ Alter (mya) höher höher höher jünger Devon Oberdevon Famennium 374,5–359 …   Deutsch Wikipedia

  • Onondaga Formation — For other uses, see Onondaga (disambiguation). Location of the Onondaga limestone outcrop in New York State, USA and Ontario, Canada. The Onondaga Formation is a group of hard limestones and dolostones of Devonian age that form an important… …   Wikipedia

  • Marcellus Formation — Stratigraphic range: Middle Devonian …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.