New data on Ordovician–Silurian conodonts and stratigraphy from the Severnaya Zemlya Archipelago, Russian Arctic

2009 ◽  
Vol 146 (4) ◽  
pp. 497-516 ◽  
Author(s):  
P. MÄNNIK ◽  
O. K. BOGOLEPOVA ◽  
A. PÕLDVERE ◽  
A. P. GUBANOV
Keyword(s):  
Shallow Water ◽  
Ural Region ◽  
Russian Arctic ◽  
Upper Ordovician ◽  
Lower Silurian ◽  
The Baltic ◽  
Severnaya Zemlya ◽  
First Time ◽  
Severnaya Zemlya Archipelago ◽  
North Greenland

AbstractThirty samples from 22 sections collected by the SWEDARCTIC international expedition to Severnaya Zemlya in 1999 contained Ordovician and Silurian conodont faunas. Several taxa, including Apsidognathus cf. milleri, Aulacognathus cf. kuehni, Nudibelodina sensitiva, Ozarkodina broenlundi and Pterospathodus eopennatus, allow precise dating of the strata in this region for the first time. The occurrence of Aphelognathus pyramidalis and Rhipidognathus aff. R. symmetricus in samples from the Strojnaya Formation fits well with the earlier dating of these strata as latest Ordovician. However, Aphelognathus sp. in sample BG-99/14-a, collected from the upper Ushakov Formation, indicates that at least in the lower reaches of the Ushakov River the top of this formation is considerably younger than considered earlier: the sampled strata are Late, not Early Ordovician in age. In the Ordovician and Silurian the present-day Severnaya Zemlya region was dominated by extensive shallow-water, mainly semi-restricted basin environments with habitat specific faunas. The occurrence of Riphidognathus aff. R. symmetricus at some levels in the Upper Ordovician suggests extreme shallowing episodes in the basin. On Severnaya Zemlya, ‘normal-marine’ faunas (including Pt. eopennatus) invaded the distal peripheral regions of the wide shallow-water platform at times of maximum sea-level rise only. The occurrence of Oz. broenlundi and N. sensitiva indicates that in the early Silurian the Severnaya Zemlya basin was quite well connected to the basins over modern North Greenland as well as to the Baltic Palaeobasin. The lower Silurian conodont assemblages in the Vodopad to Samojlovich formations are most similar to those described from the eastern Timan–northern Ural region.

scholarly journals Conodonts from the Upper Ordovician – Lower Silurian carbonate platform of North Greenland

1990 ◽  
Vol 159 ◽  
pp. 1-151
Author(s):  
H.A Armstrong
Keyword(s):  
Shallow Water ◽  
Carbonate Platform ◽  
Upper Ordovician ◽  
Lower Silurian ◽  
The North ◽  
Single Genus ◽  
Informal Groups ◽  
North Greenland

Samples from Upper Ordovician and Lower Silurian strata of the North Greenland carbonate platform have yielded approximately 16 500 identifiable conodont elements referable to 25 multi-element genera and 71 species and subspecies. A single genus, Pseudobelodella and 17 species and subspecies are new. In addition, 8 informal groups of indeterminate species of Oulodus are described. The Upper Ordovician conodont species can be referred to 'Fauna 12' of the American Midcontinent Province where the presence of Rhipodognathus symmetrius in the late Richmondian is typical of shallow water deposits. The Ordovician-Silurian boundary is difficult to place in this study using conodonts. New conodont zonations are proposed for Lower Silurian shelf and slope biofacies; two new early Llandovery conodont zones are erected in the slope biofacies, the Aspelundia expansa Biozone (?earliest Rhuddanian to early Aeronian) and the Aspelundia fluegeli Biozone (early Aeronian to early Telychian). The Pterospathodus celloni Biozone is shown to be particularly valuable in the correlation of strata of late Llandovery age throughout North Greenland.

scholarly journals Monoceratella (Ostracoda) from the Silurian of Washington Land, North Greenland

1980 ◽  
Vol 101 ◽  
pp. 37-43
Author(s):  
P.D Lane
Keyword(s):  
Upper Ordovician ◽  
Middle Ordovician ◽  
Lower Silurian ◽  
North Greenland

Monoceratella mazos n. sp. is described from the Lower Silurian of Washington Land, western North Greenland. The occurrence, together with others from the Upper Ordovician and Devonian, emphasises the possibility of homeomorphy within the otherwise typically Middle Ordovician genus Monoceratella.

scholarly journals Pleistocene ice at the bottom of the Vavilov ice cap, Severnaya Zemlya, Russian Arctic

1996 ◽  
Vol 42 (142) ◽  
pp. 403-406 ◽  
Author(s):  
Michel Stiévenard ◽  
Vladimir Nikolaëv ◽  
Dmitri Yu Bol’shiyanov ◽  
Christine Fléhoc ◽  
Jean Jouzel ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Isotope Composition ◽  
Russian Arctic ◽  
Stable Isotope Composition ◽  
The Core ◽  
Ice Cap ◽  
Basal Ice ◽  
Glacier Ice ◽  
Severnaya Zemlya ◽  
First Time

AbstractThe Vavilov ice cap was perforated in 1988 by a drilling which reached the underlying frozen sediments. In contrast to the overlying glacier ice, the basal ice is composed of different ice layers with a variable debris load. The stable-isotope composition of these layers shows δ values much lower than everywhere else in the core or in the Vavilov ice cap. This is most probably the signature of a remnant of Pleistocene ice which, for the first time, is shown to occur in the Russian Arctic.

scholarly journals Pleistocene ice at the bottom of the Vavilov ice cap, Severnaya Zemlya, Russian Arctic

1996 ◽  
Vol 42 (142) ◽  
pp. 403-406 ◽  
Author(s):  
Michel Stiévenard ◽  
Vladimir Nikolaëv ◽  
Dmitri Yu Bol’shiyanov ◽  
Christine Fléhoc ◽  
Jean Jouzel ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Isotope Composition ◽  
Russian Arctic ◽  
Stable Isotope Composition ◽  
The Core ◽  
Ice Cap ◽  
Basal Ice ◽  
Glacier Ice ◽  
Severnaya Zemlya ◽  
First Time

AbstractThe Vavilov ice cap was perforated in 1988 by a drilling which reached the underlying frozen sediments. In contrast to the overlying glacier ice, the basal ice is composed of different ice layers with a variable debris load. The stable-isotope composition of these layers shows δ values much lower than everywhere else in the core or in the Vavilov ice cap. This is most probably the signature of a remnant of Pleistocene ice which, for the first time, is shown to occur in the Russian Arctic.

scholarly journals Upper Ordovician and Silurian carbonate shelf stratigraphy, facies and evolution, eastern North Greenland

1984 ◽  
Vol 148 ◽  
pp. 1-73
Author(s):  
J.M Hurst
Keyword(s):  
Deep Water ◽  
Carbonate Rocks ◽  
Upper Ordovician ◽  
Carbonate Production ◽  
Lower Silurian ◽  
The North ◽  
Lithostratigraphic Units ◽  
Shallow Subtidal ◽  
North Greenland

A new lithostratigraphic scheme is erected for the uppermost Ordovician and lower Silurian shelf carbonate rocks of Peary Land and Kronprins Christian Land, eastern North Greenland. All carbonate rocks were deposited on a fairly stable shelf which was bordered to the north and east by deep-water basins. The shelf foundered in the latest LIandoverian, terminating carbonate production. Five formations and two members are defined and extend from the uppermost Ordovician (Cincinnatian) to the uppermost LIandoverian, or possibly lowermost Wenlock in the Silurian. Lithostratigraphic units include: Turesø Formation (new) composed of alternating light and dark grey peritidal to shallow subtidal laminated or massive dolomites, cryptalgal laminites and fenestral lime mudstones – uppermost Ordovician (Richmondian, Cincinnatian) to Lower or Middle Llandoverian; Ymers Gletscher Formation (new) composed of light grey peritidal lime mudstones, fenestral lime mudstones and cryptalgal laminites 0150 Lower to Middle Llandoverian; Odins Fjord Formation (new) composed of shallow to deep subtidal dark lime mudstones, wackestones and commonly floatstone and rudstone biostromes – Middle (possibly Lower) to Upper Llandoverian; Melville Land Member (new) composed of light grey peritidal lime mudstones, fenestral lime mudstones and cryptalgal laminites – Middle (possibly Lower) Llandoverian; Bure lskappe Member (new) composed of drowned shelf, dark grey to black laminated lime mudstone with terrigenous mudstone interbeds – Upper Llandoverian; Samuelsen Høj Formation (new) composed of light grey to white reef limestones – uppermost Llandoverian; Harefjeld Formation (new), a faulted, folded and cleaved black lime and terrigenous mudstone unit in eastern Kronprins Christian Land – Ordovician to Silurian (Llandoverian).

scholarly journals Late Ordovician jaw-bearing polychaetes from Anticosti Island, eastern Canada, and their biogeographic significance

2016 ◽  
Vol 53 (7) ◽  
pp. 731-738 ◽  
Author(s):  
Olle Hints ◽  
Petra Tonarová ◽  
André Desrochers
Keyword(s):  
Environmental Changes ◽  
Common Species ◽  
Upper Ordovician ◽  
Eastern Canada ◽  
Shallow Marine ◽  
Lower Silurian ◽  
Iapetus Ocean ◽  
The Family ◽  
Anticosti Island ◽  
First Time

The Upper Ordovician to lower Silurian shallow marine succession of Anticosti Island, eastern Canada, provides one of the most complete records across the Hirnantian in the world. This study reports a diverse assemblage of scolecodonts (polychaete jaws) from the upper Katian and Hirnantian Vauréal, Ellis Bay, and basal Becscie formations of western Anticosti. The collection of 10 samples includes ca. 30 species representing 10 families. The fauna is dominated by polychaetaspids, mochtyellids, paulinitids, and polychaeturids. The family Xanioprionidae and genera Pistoprion, Tetraprion, and Rakvereprion are documented for the first time from the Ordovician of Laurentia. The Anticosti polychaete fauna shows great similarity to the contemporaneous faunas of Baltoscandia. This is evidenced by a high relative abundance of mochtyellids and polychaeturids and a number of common species, thus suggesting that the closing Iapetus Ocean at that time did not constitute a barrier for the dispersal of jaw-bearing polychaetes. Some Laurentian influence is, however, indicated by the occurrence of hadoprionids. Distinct Katian Vauréal and Hirnantian Ellis Bay scolecodonts are likely reflecting faunal reorganization linked to local environmental changes rather than the initial phase of the Hirnantian mass extinction.

The myodocope ostracode Entomozoe from an early Silurian (Telychian, Llandovery) carbonate mound of the Samuelsen Høj Formation, North Greenland

1999 ◽  
pp. 5-12 ◽  
Author(s):  
David J. Siveter ◽  
Philip D. Lane
Keyword(s):  
Shallow Water ◽  
Rare Occurrence ◽  
Carbonate Mounds ◽  
Carbonate Mound ◽  
Original Series ◽  
Lower Silurian ◽  
Upper Silurian ◽  
North Greenland

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Siveter, D. J., & Lane, P. D. (1999). The myodocope ostracode Entomozoe from an early Silurian (Telychian, Llandovery) carbonate mound of the Samuelsen Høj Formation, North Greenland. Geology of Greenland Survey Bulletin, 184, 5-12. https://doi.org/10.34194/ggub.v184.5225 _______________ Entomozoe aff. Entomozoe tuberosa (Jones 1861), from carbonate mounds of the Samuelsen Høj Formation, represents one of the few ostracodes documented from the Silurian of Greenland and a rare occurrence of Entomozoe from outside Scotland. Like its coeval, congeneric Scottish counterparts, the Greenland Entomozoe lived on a shallow-water shelf dominated by epibenthonic fauna and probably had a benthonic, swimming(?) lifestyle. Its environmental, ecological and geographical setting is consistent with the idea that these earliest, Lower Silurian myodocopes were benthonic and, therefore, that Upper Silurian pelagic representatives must have resulted from an ecological shift in the group.

Morphological description and DNA barcoding of some Diamesinae (Diptera, Chironomidae) from the Severnaya Zemlya Archipelago and the Vaigach Island (Russian Arctic)

Zootaxa ◽  
2020 ◽  
Vol 4802 (3) ◽  
pp. 587-600
Author(s):  
ANDREY B. KRASHENINNIKOV ◽  
EUGENYI A. MAKARCHENKO ◽  
ALEXANDER A. SEMENCHENKO ◽  
MARIA V. GAVRILO ◽  
KRISTINA A. VSHIVKOVA
Keyword(s):  
Mitochondrial Gene ◽  
Interspecific Variation ◽  
Morphological Characters ◽  
Molecular Data ◽  
Genetic Distances ◽  
Morphological Description ◽  
Russian Arctic ◽  
Adult Males ◽  
Severnaya Zemlya ◽  
Severnaya Zemlya Archipelago

Chironomids of the Diamesinae subfamily from the Russian Arctic were studied using both morphological characters and molecular data. Adult males of Diamesa urvantsevi sp. nov., D. amplexivirilia Hansen, Arctodiamesa appendiculata (Lundström) from Severnaya Zemlya Archipelago and D. arctica (Boheman), Pseudokiefferiella sp. from Vaigach Island were described, redescribed, annotated and figured. A reference 658 bp barcode sequence from a fragment of the mitochondrial gene cytochrome oxidase I (COI) was used as a tool for species delimitation. For D. arctica (Boheman) and Pseudokiefferiella sp. close DNA barcodes from Norway were performed, which allowed to relate these specimens to the described species. Comparisons with corresponding regions of COI between each described species and close related congeneric species produced K2P genetic distances of 0.11–0.16, values well associated with interspecific variation. Phylogenetic relationships for genera Arctodiamesa Makarchenko and Pseudokiefferiella Zavřel were reconstructed for the first time. 

Modern benthic diatom taxocenes of loose grounds of the coast of the Severnaya Zemlya archipelago and adjacent sea areas

2020 ◽  
pp. 1-18
Author(s):  
Philipp V. Sapozhnikov ◽  
Olga Yu. Kalinina ◽  
Anastasiya A. Snigirova
Keyword(s):  
Species Composition ◽  
Coastal Water ◽  
Benthic Diatom ◽  
Water Bodies ◽  
Aquatic Habitats ◽  
Α Diversity ◽  
Average Similarity ◽  
Severnaya Zemlya ◽  
First Time ◽  
Severnaya Zemlya Archipelago

Modern taxocenes of benthic diatoms of coastal aquatic habitats of the Severnaya Zemlya archipelago were studied for the first time based on the materials of the expedition in summer 2019. The following habitats were studied: sublittoral, littoral, as well as semi-enclosed coastal water bodies. In the entire set of communities, a total of 180 species and subspecies (IST) of diatoms were noted. The local α-diversity of communities in the sublittoral was 6–26 species and IST (on average – 14.8), and for coastal locations, including the littoral – 12–51 species and IST (on average – 33). The floristic groups and coenotic groups of diatoms have been identified for sublittoral and coastal habitats. Significant differences were noted both among coastal taxocenes (average similarity of 23.41% in species composition and 9.78% in structure) and among sublittoral communities (19.51% and 34.54%, respectively). The entire spectrum of the noted on permanent slides species are photodocumented.

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