The Moscovian is in the ICS geologic timescale a stage or age in the Pennsylvanian , the youngest subsystem of the Carboniferous . The Moscovian age lasted from 315.2 to 307 Ma , is preceded by the Bashkirian and is followed by the Kasimovian . The Moscovian overlaps with the European regional Westphalian stage and the North American Atokan and Desmoinesian stages.
6-562: The Moscovian Stage was introduced by Sergei Nikitin (1850 - 1909) in 1890, using brachiopods in the Moscow Basin of European Russia . Nikitin named the stage after Moscow , then a major city and now the capital of Russia . The base of the Moscovian is close to the first appearances of the conodonts Declinognathodus donetzianus and Idiognathoides postsulcatus or otherwise the fusulinid Aljutovella aljutovica . Because
12-742: The Moscovian (base of the Kasimovian) is at the base of the fusulinid biozone of Obsoletes obsoletes and Protriticites pseudomontiparus , or with the first appearance of the ammonite genus Parashumardites . In European Russia and Eastern Europe , where the stage was first recognized, the Moscovian is subdivided into four regional substages: Vereiskian, Kashirskian, Podolskian, and Myachkovskian, named after towns near Moscow ( Vereya , Kashira , Podolsk , and Myachkovo ). The Moscovian can biostratigraphically be divided into five conodont biozones : Sergei Nikitin (geologist) Sergei Nikolaevich Nikitin (4 February 1851 – 18 November 1909)
18-466: The fusulinid species are regionally different, they can not be used for worldwide correlation. A Global Boundary Stratotype Section and Point for the Moscovian Stage has yet to be defined (2008). A proposal is to use the first appearance of the conodont Diplognathodus ellesmerensis , but since the species is rare and its evolution relatively unknown, it has not been accepted yet. The top of
24-561: Was a Russian geologist and paleontologist. He took a special interest in stratigraphy and worked especially on the progression of the Jurassic of Central Russia. He was also involved in studies on hydrogeology aimed at water management in Russia. Nikitin was born in Moscow where his father was an anatomist at Moscow University. He took an early interest in the natural sciences and at school he
30-726: Was appointed by the Imperial Saint Petersburg Mineralogical Studies along with K. O. Milashevich who later withdrew due to poor health. He studied Jurassic strata in Moscow, the Oka and Upper Volga basins. Among Nikitin's students was the pioneering geologist Maria Tsvetaeva. Nikitin received the Helmersen Prize of the St. Petersburg Academy of Sciences for 1883 and the Medal of Constantine from
36-516: Was introduced to field geology and botany by G.E. Shchurovskii and N.N. Kaufman. He joined Moscow University , graduating in 1871. He then taught botany and geography at schools and conducted courses on mineralogy and geology for women. He then obtained a master's degree for studies on ammonites in 1879. When the Russian Geological Survey was created he was appointed senior geologist in 1882 and began to examine stratigraphy and
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