scholarly journals A New Species of Leclercqia Banks, Bonamo et Grierson (Lycopsida) from the Middle Devonian of North Xinjiang, China, with a Possible Climbing Habit

2011 ◽  
Vol 172 (6) ◽  
pp. 836-846 ◽  
Author(s):  
Hong-He Xu ◽  
Christopher M. Berry ◽  
Yi Wang ◽  
John E. A. Marshall
Keyword(s):  
New Species ◽  
Middle Devonian ◽  
North Xinjiang ◽  
A New Species

A new species of Droharhynchia (Brachiopoda) from the lower Middle Devonian (Eifelian) of west-central Alaska

1994 ◽  
Vol 68 (6) ◽  
pp. 1235-1240 ◽  
Author(s):  
Mary E. Baxter ◽  
Robert B. Blodgett
Keyword(s):  
New Species ◽  
Middle Devonian ◽  
The Arctic ◽  
Geographic Proximity ◽  
Brooks Range ◽  
West Central ◽  
Arctic Alaska ◽  
Northern Alaska ◽  
A New Species

A new species of the genus Droharhynchia Sartenaer is established from lower Eifelian strata of west-central Alaska and the northwestern Brooks Range of Alaska. Droharhynchia rzhonsnitskayae n. sp. occurs in the Cheeneetnuk Limestone of the McGrath A-5 quadrangle, west-central Alaska, and the Baird Group of the Howard Pass B-5 quadrangle, northwestern Alaska. These occurrences extend the lower biostratigraphic range of both the genus and the subfamily Hadrorhynchiinae into the Eifelian. They also suggest close geographic proximity of the Farewell terrane of southwestern and west-central Alaska and the Arctic Alaska superterrane of northern Alaska during Devonian time.

scholarly journals Problematic Sclerites Eurytholia from the Lower and Middle Devonian of the Czech Republic

2019 ◽  
Vol 53 (1) ◽  
pp. 1-11
Author(s):  
Michal Mergl
Keyword(s):  
Czech Republic ◽  
New Species ◽  
Middle Devonian ◽  
Lower Devonian ◽  
Time Range ◽  
Formal Description ◽  
The Czech Republic ◽  
Barrandian Area ◽  
First Time ◽  
A New Species

AbstractProblematic phosphatic sclerites Eurytholia are reported for the first time from the Middle Devonian. Unequivocal sclerites were observed in limestones of Emsian to late Eifelian age in six localities of the Barrandian area of the Central Bohemia of the Czech Republic. Formerly observed size and shape variations of Eurytholia sclerites prevent formal description of a new species on few specimens of Emsian and Eifelian age. Therefore the new specimens are identified as Eurytholia aff. bohemica. Their presence indicates longer time range of the Eurytholia animal, covering not only the Ordovician, the Silurian and the earliest Devonian as known formerly, but also late Lower Devonian and the Middle Devonian. Similar features in morphology and histology of Eurytholia indicate relationship to a conodont Pseudooneotodus and a support suggestion about the vertebrate origin of Eurytholia sclerites.

Nadiastrophia from the Headless Formation (Eifelian), Mackenzie Mountains, District of Mackenzie, Northwest Territories

1973 ◽  
Vol 10 (9) ◽  
pp. 1460-1464 ◽  
Author(s):  
A. C. Lenz
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Middle Devonian ◽  
Southeastern Pacific ◽  
Mackenzie Mountains ◽  
A New Species

The genus Nadiastrophia previously recorded only from Australia and China, is described from the Headless Formation of the Mackenzie Mountains. This discovery further emphasizes the early Middle Devonian faunal affinities between the Cordilleran and southeastern Pacific regions. The Mackenzie Mountains Nadiastrophia is assigned to a new species, N. mackenziensis.

scholarly journals A new species of the antiarch Microbrachius from the Middle Devonian (Givetian) of Belarus

2018 ◽  
Vol 67 (1) ◽  
pp. 3
Author(s):  
J L den Blaauwen ◽  
E Mark-Kurik ◽  
M J Newman ◽  
U Toom
Keyword(s):  
New Species ◽  
Middle Devonian ◽  
A New Species

Conodont biostratigraphy of the Little Cedar and Lower Coralville Formations of the Cedar Valley Group (Middle Devonian) of Iowa and significance of a new species of Polygnathus

1998 ◽  
Vol 72 (4) ◽  
pp. 726-737 ◽  
Author(s):  
Frederick S. Rogers
Keyword(s):  
New Species ◽  
Shallow Water ◽  
Middle Devonian ◽  
Russian Platform ◽  
Large Numbers ◽  
Conodont Zonation ◽  
Coralville Formation ◽  
A New Species ◽  
Water Carbonate ◽  
Shallow Water Carbonate

The Little Cedar and lower Coralville formations of the Cedar Valley Group (Middle Devonian) of Iowa were deposited on a cratonic, shallow-water, carbonate and evaporite shelf during the Taghanic onlap. Four conodont subzones, zones, or cratonic biofacies faunas can be recognized in this sequence of strata. They are, in ascending order, the Middle varcus Subzone (recognized in the lower Little Cedar Formation), the hermanni zone (recognized in the middle Little Cedar Formation), the Lower subterminus Fauna (recognized in the upper Little Cedar Formation), and the Upper subterminus Fauna (recognized in the lower Coralville Formation). The Lower subterminus Fauna and the Upper subterminus Fauna represent a possible zonal span from the Lower hermanni Zone to the Upper disparilis Zone of the standard conodont zonation.In the Polygnathus- and Icriodus-dominated conodont faunas studied is a biostratigraphically useful new species. Polygnathus klugi new species is a Polygnathus dubius-like form that occurs sporadically and in small numbers in the Middle varcus Subzone, the hermanni Zone, and the Upper subterminus Fauna. However, it occurs consistently and in large numbers in the Lower subterminus Fauna, where it is the characterizing species. It has also been recovered from core samples both in central Alberta, Canada, and the Russian Platform. In both areas, it is associated with conodonts of the subterminus faunal interval.

Les trilobites Otarionidae du Devonien armoricain

1956 ◽  
Vol S6-VI (1-3) ◽  
pp. 27-41
Author(s):  
Jean Pillet
Keyword(s):  
New Species ◽  
Recent Work ◽  
Middle Devonian ◽  
Armorican Massif ◽  
A New Species

Abstract Recent work has made it possible to determine the Devonian representatives of the trilobite family Otarionidae from the Armorican massif, France. Most of the material consists of isolated or fragmentary specimens. Of the eleven different Devonian forms, eight are identified specifically, among them a new species, Otarion (Otarion) ferronnierense, from the base of the middle Devonian.

Conodonts from the Prout Dolomite of north-central Ohio and Givetian (upper Middle Devonian) correlation problems

1999 ◽  
Vol 73 (5) ◽  
pp. 892-907 ◽  
Author(s):  
Dale R. Sparling
Keyword(s):  
New York ◽  
New Species ◽  
North America ◽  
Middle Devonian ◽  
Taxonomic Status ◽  
Middle Part ◽  
North Central ◽  
Continuous Sedimentation ◽  
Stratotype Section ◽  
A New Species

The Prout Dolomite of north-central Ohio lies disconformably above the lowest Givetian (upper Middle Devonian) Plum Brook Shale and below the lowest Famennian (upper Upper Devonian) Ohio Shale. A sample from its base yielded over 4,000 diverse conodont specimens. Included isPolygnathus ansatusZiegler and Klapper, 1976, the index species for the MiddlevarcusSubzone, which is not reported from strata of this age in Ontario and Indiana, a fact that long caused their miscorrelation with the LowervarcusSubzone. Also present isP. rhenanusKlapper, Philip, and Jackson, 1970, considered to be also indicative of the MiddlevarcusSubzone in North America, andP. ovatinodosusZiegler and Klapper, 1976. Lowest occurrences of the latter are in the middle part of this subzone; its presence indicates correlation with the lower Tully Limestone of New York, the basal unit of the Taghanic Series. The Prout and equivalent strata in the region therefore represent a long unrecognized continuous time-rock unit created by Johnson's (1970) Taghanic onlap. The collection includes a new species ofAncyrolepis, A. huntleyi; a new species ofPolygnathusis left in open nomenclature, as are nine specimens assigned toTortodusbut of otherwise uncertain taxonomic status.Givetian conodont correlation between North America and the Global Stratotype Section and Point established by the Subcommission on Devonian Stratigraphy (SDS) in Morocco is extremely problematical because of relatively erratic distribution (probably owing to limited ecologic adaptability) ofP. ansatusandP. hemiansatusBultynck, considered herein to be an early morphotype ofP. ansatus.The base of the Givetian Stage has been defined by the SDS as coinciding with the lowest occurrence ofP. hemiansatus.The only possible evidence for the SDS'shemiansatusZone in North America involves reported occurrence of that morphotype in the uppermost Arkona Shale of Ontario, a position above the top of the Plum Brook Shale, which has been considered to be of Givetian age for decades. Also it appears that the interval between the Eifelian (lower Middle Devonian)kockelianusZone and thehemiansatusZone at the SDS's global-stratotype section in Morocco is of questionable age and probably too thin to represent continuous sedimentation. Adoption of a widely recognized faunal break at the base of strata deposited during the If T-R cycle of North America and Europe as the base of the Givetian could provide a sound alternative.

The oldest species of ?Yavorskia (Tabulata) from the Upper Famennian of the Holy Cross Mountains (Poland)

2012 ◽  
Vol 62 (2) ◽  
pp. 197-204 ◽  
Author(s):  
Mikołaj K. Zapalski ◽  
Błażej Berkowski
Keyword(s):  
New Species ◽  
Middle Devonian ◽  
Early Carboniferous ◽  
Holy Cross Mountains ◽  
Central Poland ◽  
Southern Margin ◽  
Tabulate Coral ◽  
Conodont Zone ◽  
A New Species

ABSTRACT Zapalski, M.K. and Berkowski, B. 2012. The oldest species of ?Yavorskia (Tabulata) from the Upper Famennian of the Holy Cross Mountains (Poland). Acta Geologica Polonica, 62 (2), 197-204. Warszawa. A single perfectly preserved colony of a tabulate coral assigned tentatively to the genus Yavorskia Fomitchev, 1931, collected from Upper Famennian beds (Palmatolepis expansa conodont Zone) in a trench located north of the Kowala Quarry (Holy Cross Mts., central Poland) is here described as a new species, ?Y. paszkowskii sp. nov. It differs from other representatives of the genus in the lack of dissepimental structures and in smaller corallite diameters, and may therefore represent the ancestral taxon of this typically early Carboniferous genus. Yavorskia tabulates were apparently migrating eastwards along the southern margin of Laurussia and farther east and north towards Siberia, as they appear in the Famennian in Europe and in the early Carboniferous in the Altaides. Such a conclusion is consistent with previous observations on Early-Middle Devonian pleurodictyform tabulate distribution.

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