The Upper Devonian (Frasnian) conodont sequence in the Lime Creek Formation of north-central Iowa and comparison with Lime Creek ammonoid, brachiopod, foraminifer, and gastropod sequences

1990 ◽  
Vol 64 (4) ◽  
pp. 614-628 ◽  
Author(s):  
Jed Day
Keyword(s):  
United States ◽  
Species Composition ◽  
Northwest Territories ◽  
Upper Devonian ◽  
Western Canada ◽  
North Central ◽  
Conodont Zone ◽  
Lowermost Part ◽  
Conodont Fauna ◽  
First Time

The Upper Devonian (Frasnian) conodont fauna of the Lime Creek Formation of north-central Iowa is dominated by species of Polygnathus. Patterns of species composition and abundance are consistent with the Polygnathus biofacies described from the Frasnian of the Northwest Territories of western Canada. Consequently, the standard Frasnian conodont zones, defined on sequences developed in the Palmatolepis biofacies, are not applicable to the Lime Creek sequence. The Lime Creek conodont sequence correlates with Zones 4, 5 and Faunal Interval 7 of the Frasnian conodont sequence in the Alberta Rockies and with similar sequences in the southwestern United States. The Pb elements of Palmatolepis semichatovae Ovnatanova and Ancyrognathus? deformis (Anderson) are described and illustrated for the first time.In the Lime Creek Formation of north-central Iowa, brachiopods of the lowermost part of the Nervostrophia thomasi Zone of Day (1989a) occur in Zone 4, brachiopods of most of the N. thomasi, Douvillina arcuata, and Cyrtospirifer whitneyi Zones span conodont Zone 5, and the Elita inconsueta and Iowatrypa owenensis Zones occur in Faunal Interval 7. Species of the ammonoid Manticoceras and of the gastropods Floyda, Turbonopsis, and Westerna are restricted to Faunal Interval 7. Species of the calcareous foraminifer Nanicella first occur in Zone 5, and are joined by species of Multiseptida high in Zone 5.

Monelasmina besti, a new Schizophoriid Brachiopod from the Upper Devonian of Western Canada

1959 ◽  
Vol 96 (6) ◽  
pp. 470-472 ◽  
Author(s):  
A. E. H. Pedder
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Upper Devonian ◽  
Western Canada ◽  
A New Species

AbstractMonelasmina, previously known only from the Frasnian of Europe, is described and figured from the Hay River formation (Frasnian) of the Northwest Territories, Canada. The specimens are referred to a new species, M. besti.

A NEW DATA ON UPPER ORDOVICIAN CONODONTS FROM THE GURYANOVKA FORMATION, NORTHEAST OF GORNY ALTAI

2021 ◽  
pp. 3-11
Author(s):  
D. A. Pecherichenko ◽  
◽  
O. T. Obut ◽  
N. V. Sennikov ◽  
◽  
...  
Keyword(s):  
Upper Ordovician ◽  
Precise Position ◽  
Gorny Altai ◽  
Conodont Zone ◽  
Conodont Fauna ◽  
First Time

The detailed study of the Guryanovka Formation key sections at the northeast of Gorny Altai (Biya and Bura sections) for the first time revealed the representative collection of conodonts. The conodont fauna is composed of 12 species belong to 9 genera: Belodina compressa (Branson and Mehl, 1933), Phragmodus undatus Branson and Mehl, 1933, Panderodus gracilis (Branson and Mehl, 1933), Panderodus acostatus (Branson, Branson, 1947), Tasmanognatus careyi Burret, 1979, Aphelognathus sp., Panderodus sp., Drepanoistodus sp., Drepantodus sp., Colaptoconus sp., Paltodus sp., Scandodus sp. For the first time, the precise position of the P. undatus conodont Zone was defined in Gorny Altai (continuous Biya Section, base of unit 3).

New acritarch taxa from the Middle and Upper Devonian (Givetian–Frasnian) of western Canada

1991 ◽  
Vol 28 (9) ◽  
pp. 1471-1487 ◽  
Author(s):  
Robert E. Turner
Keyword(s):  
Northwest Territories ◽  
New Taxa ◽  
Upper Devonian ◽  
Western Canada ◽  
New Genera

Eight new acritarch species, four of which are assigned to new genera, are described from Givetian and Frasnian strata of Alberta and the Northwest Territories. The new taxa are Apectosphaeridium apoplanium n.gen. et sp., Asyncosmium isum n.gen. et sp., Cerastum pelorum n.gen. et sp., Variolidium omnium n.gen. et sp., Goniosphaeridium rallum n.sp., Leiosphaeridia gigantea n.sp., Polyedryxium leptum n.sp., and Saharidia perplexa n.sp.

New distribution records for 48 species of Polyporaceae in western Canada

1971 ◽  
Vol 49 (6) ◽  
pp. 899-902
Author(s):  
James H. Ginns ◽  
Ruth Macrae
Keyword(s):  
British Columbia ◽  
Northwest Territories ◽  
Yukon Territory ◽  
Western Canada ◽  
Number Of Species ◽  
First Time ◽  
New Distribution

Forty-eight species of Polyporaceae are reported for the first time from the four western Provinces and Yukon and District of Mackenzie of the Northwest Territories. The number of species reported are from Manitoba 11, Saskatchewan 8, Alberta 20, British Columbia 10, Yukon Territory 4, and Northwest Territories (Mackenzie Dist.) 13.

On a varcus Zone conodont fauna from the Ilfracombe Slates (Devonian, North Devon)

1979 ◽  
Vol 116 (2) ◽  
pp. 129-134 ◽  
Author(s):  
M. J. Orchard
Keyword(s):  
Middle Devonian ◽  
Upper Devonian ◽  
The North ◽  
Conodont Zone ◽  
German Standard ◽  
Conodont Fauna

SummarySeveral conodont faunas from the Ilfracombe Slates are described and their age discussed. One is referred to the conodont zone of Polygnathus varcus (late Givetian-early Frasnian). The conodonts, the first from the Devonian of North Devon, indicate that, in terms of the German standard, the uppermost Ilfracombe Slates are no younger than basal Manticoceras Stufe in age. The position of the Middle/Upper Devonian boundary within the North Devon sequence is discussed with reference to the limestones of the Combe Martin Slates (the ‘Ilfracombe limestones’), which are regarded here as Middle Devonian in age.

Polygnathids (Conodonta) around the Pragian/Emsian boundary from the Dacun-1 section (central Guangxi, South China)

2019 ◽  
Vol 93 (06) ◽  
pp. 1210-1220 ◽  
Author(s):  
Jian-Feng Lu ◽  
José Ignacio Valenzuela-Ríos ◽  
Jau-Chyn Liao ◽  
Yi Wang
Keyword(s):  
South China ◽  
Lower Boundary ◽  
South China Block ◽  
The South ◽  
Lowermost Part ◽  
Conodont Fauna ◽  
First Time ◽  
Upper Boundary

AbstractThe base of the Emsian, which is defined by the first appearance of the conodont Polygnathus kitabicus, has never been successfully demonstrated in the South China Block (including Guangxi and eastern Yunnan). As a result, we studied conodonts from the lowermost part of the Shizhou Member of the Yukiang Formation at the Dacun-1 section in the Liujing area, Guangxi. This new investigation has revealed a conodont fauna only consisting of Polygnathus pireneae, P. sokolovi, P. kitabicus, P. sp. and Pandorinellina exigua philipi, which can be assigned to the uppermost part of the pireneae Zone and the lowermost part of the kitabicus Zone in ascending order. The Pragian/Emsian boundary at the Dacun-1 section is located in the highest thick-bedded limestone bed that can be observed in the lowermost part of the Shizhou Member. Therefore, this is the first time that the lower boundary of the Emsian defined by the lowest occurrence of P. kitabicus is reported in the South China Block. However, the scarcity of suitable limestone samples for conodont analysis in the middle and upper parts of the Shizhou Member precludes definitive identification of the upper boundary of the kitabicus Zone in the Liujing area.

Conodont biostratigraphy of the Chattanooga Shale, Middle and Upper Devonian, southern Appalachian basin, eastern United States

2007 ◽  
Vol 81 (6) ◽  
pp. 1194-1217 ◽  
Author(s):  
D. Jeffrey Over
Keyword(s):  
United States ◽  
Appalachian Basin ◽  
Upper Devonian ◽  
Eastern United States ◽  
Conodont Biostratigraphy ◽  
Fine Grained ◽  
Southern Appalachian ◽  
Global Correlation ◽  
Chattanooga Shale ◽  
Conodont Fauna

The Chattanooga Shale of the southern Appalachian Basin contains a diverse conodont fauna of the high Givetian, Frasnian, and Famennian. The predominantly fine-grained strata were deposited in an offshore setting where depositional packages are separated by unconformities. Conodonts allow regional and global correlation of these strata, recognition of the Frasnian-Famennian boundary, and narrow biostratigraphic constraint of two Frasnian ash beds, MN Zone 8 for the Belpre Ash and upper MN Zone 13 for the Center Hill Ash. Three new Frasnian palmatolepid conodonts are described in open nomenclature, and the holotype ofPalmatolepis regularisCooper is reillustrated.

To the species composition of oribatid mites (Acari, Oribatida) of Rivnensky Nature Reserve

2019 ◽  
Vol 16 (1) ◽  
pp. 21-24
Author(s):  
O.S. Shevchenko
Keyword(s):  
Species Composition ◽  
Nature Reserve ◽  
Mite Species ◽  
Oribatid Mites ◽  
First Time

New data was added to the oribatid species composition of the Rivnensky Nature Reserve. Overall, 62 mite species were recorded for the territory of research in this study. The species Acrogalumna longipluma, Micreremus brevipes, Licneremaeus licnophorus, Oribatella reticulata, and Porobelba spinosa were not previously listed for the Western Polissia. Of the 60 species of Lower Oribatida mites that have been recorded by other authors in that area, only 18 are found again in the Rivnensky Nature Reserve, indicating that our results are intermediate. A representative of the genus Mainothrus Choi, 1996 (Mainothrus badius (Berlese, 1905)) is found in Ukraine for the first time.

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