Tippecanoe Sequence OverviewMiddle Ordovician Series through Lower Devonian Series

1990 ◽  
Author(s):  
Dennis R. Kolata
Keyword(s):  
Lower Devonian ◽  
Middle Ordovician

Regulaecystis devonica, a new Devonian pleurocystitid cystoid from Devon

1974 ◽  
Vol 111 (4) ◽  
pp. 349-352 ◽  
Author(s):  
C. R. C. Paul
Keyword(s):  
Lower Devonian ◽  
Junior Synonym ◽  
Middle Ordovician

SummaryRegulaecystis devonica, which is probably from the Meadfoot Beds (Siegeman— Emsian) near Torquay, Devon, is characterized by smooth thick thecal plates and a deeply sunken pectinirhomb. Coopericystis Parsley from the Middle Ordovician of Tennessee is considered a junior synonym of Regulaecystis from the Lower Devonian of Europe.

The Tippecanoe Sequence: Middle Ordovician—Lower Devonian

1987 ◽  
pp. 135-201
Author(s):  
William J. Frazier ◽  
David R. Schwimmer
Keyword(s):  
Lower Devonian ◽  
Middle Ordovician

Stratigraphie du Paleozoique de la zone axiale pyreneenne a l'E de l'Ariege

1958 ◽  
Vol S6-VIII (8) ◽  
pp. 853-867 ◽  
Author(s):  
Pierre Cavet
Keyword(s):  
Middle Devonian ◽  
Lower Devonian ◽  
Upper Devonian ◽  
Axial Zone ◽  
Middle Ordovician ◽  
Bottom Upward

Abstract The Paleozoic section in the axial zone of the Pyrenees east of the Ariege, France, consists, from the bottom upward, of the Canaveilles series of interbedded graphitic schists, limestones, and metavolcanics (attributed to the Cambrian), the more homogeneous Jujols schists (lower and middle Ordovician), dated Ashgillian and Gotlandian (Silurian) schists and fossiliferous limestones, grading upward into undifferentiated lower Devonian beds, gray massive middle Devonian limestones, diversified upper Devonian formations, and a zone of transgressive Dinantian (Carboniferous) beds which forms the transition to shaly Visean so-called Culm deposits.

New recumbent echinoderm genera from the Bois d'Arc Formation: Lower Devonian (Lochkovian) of Coal County, Oklahoma

2007 ◽  
Vol 81 (6) ◽  
pp. 1486-1493 ◽  
Author(s):  
Ronald L. Parsley ◽  
Colin D. Sumrall
Keyword(s):  
Great Britain ◽  
West Virginia ◽  
North American ◽  
Lower Devonian ◽  
Late Ordovician ◽  
Upper Ordovician ◽  
Early Devonian ◽  
Middle Ordovician

An echinoderm fauna from the Lower Devonian (Lochkovian) Cravatt Member of the Bois d'Arc Formation near Clarita, Oklahoma, has yielded specimens of recumbent, essentially bilaterally symmetrical taxa which are similar to Ordovician genera but absent or sparsely represented in Silurian strata. Claritacarpus smithi n. gen. and sp., is a dendrocystitid homoiostele with morphology similar to the Late Ordovician Dendrocystoides Jaekel, 1918; the anomalocystitid stylophoran Victoriacystis aff. holmesorum Ruta and Jell, 1999 shows strong affinities to Victoriacystis holmesorum Ruta and Jell, 1999, Humevale Formation, of Victoria, Australia; and the pleurocystitid rhombiferan, Turgidacystis graffhami n. gen. and sp., has close affinities to the Middle Ordovician Coopericystis Parsley, 1970 of West Virginia and Henicocystis Jell, 1983 of Victoria, Australia. Claritacarpus and Turgidacystis are North American range extensions for homoiosteles and pleurocystitids, respectively, being previously unknown from rocks younger than Upper Ordovician. Globally, Silurian homoiosteles and pleurocystitids are unknown although both occur in the Lower Devonian of Germany and Australia; additionally, Early Devonian pleurocystitids are known from Great Britain and Bohemia. These genera illustrate a pseudoextinction pattern suggesting a significant unsampled Silurian “homalozoan” and pleurocystitid history.

scholarly journals Middle devonian-lower frasnian natural hydrocarbon reservoirs of the Pechora Sea shelf and Timan-Pechora oil and gas province adjacent area

2021 ◽  
pp. 16-25
Author(s):  
E. B. Rile ◽  
◽  
A. V. Ershov ◽  
A. V. Ershov ◽  
Keyword(s):  
Lower Devonian ◽  
Oil And Gas ◽  
Hydrocarbon Reservoirs ◽  
Adjacent Area ◽  
Middle Ordovician ◽  
Natural Reservoir ◽  
Gas Potential ◽  
Terrigenous Complex ◽  
Lower Frasnian ◽  
Natural Hydrocarbon

The research is based on the three-layer natural hydrocarbon reservoirs theory, which allocates 3 layers in a natural reservoir – the genuine seal, the productive part and the intermediate layer situated between them - the false seal. The Middle Ordovician-Lower Frasnian terrigenous complex variable in thickness, composition and stratigraphic completeness sub-regional natural reservoir was identified in the northern part of the Timan-Pechora oil and gas province adjacent to the Pechora Sea. It includes several zonal and local natural reservoirs (Middle Ordovician-Lower Devonian, Middle Ordovician-Eiffelian, Zhivetian-Lower Frasnian and others). The distribution areas of these natural reservoirs were extrapolated to the Pechora Sea offshore. The areas with the highest prospects of oil and gas potential of the Pechora Sea offshore were delineated, basing on the Timan-Pechora oil and gas potential analysis. These are the northwest extensions into the Pechora Sea of the Denisov trough, the Kolva megaswell, as well as the Varandei-Adzva structural zone and the Karotaiha depression. Keywords: natural reservoir; genuine seal; false seal; field; pool; hydrocarbons.

The earliest ostracods from the Ordovician of the Prague Basin, Czech Republic

2014 ◽  
Vol 64 (4) ◽  
pp. 367-392 ◽  
Author(s):  
Karolína Lajblová ◽  
Petr Kraft
Keyword(s):  
Czech Republic ◽  
Bohemian Massif ◽  
Massif Central ◽  
Central European ◽  
Middle Ordovician ◽  
Prague Basin ◽  
Barrandian Area ◽  
Fossil Assemblages ◽  
European Variscides

Abstract The earliest ostracods from the Bohemian Massif (Central European Variscides) have been recorded from the Middle Ordovician of the Prague Basin (Barrandian area), in the upper Klabava Formation, and became an abundant component of fossil assemblages in the overlying Šarka Formation. Both early ostracod associations consist of eight species in total, representing mainly eridostracans, palaeocopids, and binodicopids. The revision, description, or redescription of all species and their distribution in the basin is provided. Their diversification patterns and palaeogeographical relationships to ostracod assemblages from other regions are discussed.

Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa

1956 ◽  
Author(s):  
A.F. Agnew ◽  
A.V. Heyl ◽  
C.H. Behre ◽  
E.J. Lyons
Keyword(s):  
Middle Ordovician
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