Artinskian Stage

Artinskian Stage

      third of the four stages of the Lower Permian (Cisuralian) Series, representing those rocks deposited during Artinskian time (284.4 million to 275.6 million years ago) in the Permian Period. Rocks of Artinskian time were deposited in marine environments. In its type area in the Ural region of Russia, these strata were mainly sandstones (sandstone), siltstones (siltstone), shales (shale), and conglomerates (conglomerate) deposited on a steep inclined ramp near the edge of the Russian Platform. During the Artinskian, this ramp became a marine tectonic foredeep (tectonic landform) (a narrow trough filled with sediment) in the western part of the Ural geosyncline as the Uralian orogenic belt moved progressively westward. The base of the Artinskian is marked by the first appearance of the conodonts (conodont) Sweetognathus whitei and Mesogondolella bisselli. The stage is also characterized by biostratigraphic zones containing fusulinids (fusulinid) (single-celled organisms with complex shells) that are primitive members of the genus Parafusulina and ammonites (ammonoid) of the genera Metaperrinites and Perrinites. The Artinskian Stage overlies the Sakmarian Stage and is overlain by the Kungurian Stage.

June R.P. Ross Charles A. Ross
 

* * *


Universalium. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Kungurian Stage — ▪ geology       last of the four stages of the Lower Permian (Cisuralian) Series, encompassing all rocks deposited during the Kungurian Age (275.6 million to 270.6 million years ago) of the Permian Period. Rock exposures from this stage are well… …   Universalium

  • Sakmarian Stage — ▪ geochronology       second of the four stages of the Early Permian (Cisuralian) Epoch, encompassing all rocks deposited during the Sakmarian Age (294.6 million to 284.4 million years ago) of the Permian Period. Rocks deposited during the… …   Universalium

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

  • Permian Period — Interval of geologic time, 290–248 million years ago. The last of the six periods of the Paleozoic Era, it follows the Carboniferous Period. During the Permian, the continents joined to form a single supercontinent, Pangea. Hot, dry conditions… …   Universalium

  • Permian — For the language family, see Permic languages. For the high school, see Permian High School. For the geological basins, see Permian Basin. Permian Period 299–251 million years ago …   Wikipedia

  • Changhsingian — System Series Stage Age (Ma) Triassic Lower Induan younger Permian Lopingian …   Wikipedia

  • Geology of the North Sea — Contents 1 Tectonic structure 2 Precambrian 3 Finnmarkian, Athollian, Caledonian Orogenies …   Wikipedia

  • Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

  • Middle Pleistocene — Subdivisions of the Quaternary Period System Series Stage Age (Ma) Quaternary Holocene 0–0.0117 Pleistocene Tarantian (Upper) 0.0117–0.126 …   Wikipedia

  • Chattian — System Series Stage Age (Ma) Neogene Miocene Aquitanian younger Paleogene Oligocene …   Wikipedia

Share the article and excerpts

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