Late Early Devonian (Late Emsian) eospiriferinid brachiopods from Shellabarger Pass, south-central Alaska, and their biogeographic importance; further evidence for a Siberian origin of the Farewell and allied Alaskan accreted terranes

1999 ◽  
Vol 79 (1) ◽  
pp. 209-221 ◽  
Author(s):  
Robert B. Blodgett ◽  
Arthur J. Boucot
Keyword(s):  
Early Devonian ◽  
South Central ◽  
Accreted Terranes ◽  
Late Emsian

New Early Devonian pteraspidids (Agnatha, Heterostraci) from Death Valley National Monument, southeastern California

1996 ◽  
Vol 70 (1) ◽  
pp. 152-161 ◽  
Author(s):  
David K. Elliott ◽  
Robert R. Ilyes
Keyword(s):  
Estuarine Environment ◽  
Death Valley ◽  
Early Devonian ◽  
National Monument ◽  
Bearing Unit ◽  
Late Emsian

Two species and genera of pteraspidids (Agnatha, Heterostraci), Blieckaspis priscillae n. gen., and Panamintaspis snowi n. gen. and n. sp., together with two undetermined species, are described from the lower part of the Lippincott Member of the Lost Burro Formation, southeastern California. The sharing of similar faunal elements with the Early Devonian assemblages of the Sevy Dolomite and Water Canyon Formation of Utah and Nevada, respectively, together with stratigraphic constraints on the age of the Death Valley fauna, suggest that these assemblages are age equivalent and have a late Emsian (inversus–serotinus Zones) age. The vertebrate-bearing unit of the Lippincott Member is interpreted as a channel-fill deposit laid down in an estuarine environment with low or fluctuating salinity.

The dipnoan species, Sorbitorhynchus deleaskitus , from the Lower Devonian of Guangxi, China

1993 ◽  
Vol 340 (1291) ◽  
pp. 1-24 ◽  
Keyword(s):  
Lower Devonian ◽  
Early Devonian ◽  
Hyoid Arch ◽  
New Perspective ◽  
Dermal Bones ◽  
Late Emsian

A dipnoan species from the Emsian of Guangxi, China, Sorbitorhynchus deleaskitus , which has previously been diagnosed in the appendix to a more general paper on dipnoan phylogeny (Cambell & Barwick 1990), is described in detail. The head is large and heavily ossified, with cosmine on the external dermal bones. The dental plates are thick and have few poorly defined large tuberosities towards their anterolateral edges. It is the only Early Devonian dipnoan for which the full hyoid arch, gular, basibranchial, and submandibular plates are preserved, and in which the parasphenoid is clearly defined. In many features the genus is more advanced than Dipnorhynchus , but in none is it more advanced than Dipterus , apart from the loss of the buccohypophysial foramen. It gives a new perspective on late Emsian evolution of the group, and reinforces our concept of an independently developing dentine-plated line contemporaneous with a true tooth-plated line.

Diachronous Paleozoic accretion of peri-Gondwanan terranes at the Laurentian margin

2018 ◽  
Vol 470 (1) ◽  
pp. 289-310 ◽  
Author(s):  
John W. F. Waldron ◽  
David I. Schofield ◽  
J. Brendan Murphy
Keyword(s):  
Modern Concept ◽  
Early Devonian ◽  
Provenance Data ◽  
Iapetus Ocean ◽  
Accreted Terranes ◽  
Wilson Cycle ◽  
Depositional Age ◽  
Laurentian Margin ◽  
Back Arc ◽  
Timing Of Arrival

AbstractIn the original Wilson cycle, the northern Appalachian–Caledonide orogen resulted from the collision of two continental masses separated by a single ocean. One of these corresponds to the modern concept of Laurentia, but the colliding continent to the east has been variously subdivided into many smaller terranes and domains, including Ganderia, Avalonia and Megumia. Using published stratigraphic evidence and detrital zircon provenance data from units of known depositional age, the timing of arrival of these units at the Laurentian margin between the Early Ordovician and Early Devonian can be constrained. Several of the accreted terranes do not extend over the entire length of the orogen, with the result that the lines separating them change character along strike from terrane-bounding sutures to simple accretionary faults. The Ganderia domain consists of at least four separate terranes that share a common origin on the continental margin of Gondwana, but were separated by back-arc oceanic crust as they crossed the Iapetus Ocean and collided diachronously with the Laurentian margin.

Early Devonian (late Emsian) Brachiopods from Zhongping, Xiangzhou, central Guangxi, China

1999 ◽  
Vol 79 (1) ◽  
pp. 223-265 ◽  
Author(s):  
Xiu-Qin Chen ◽  
Zhao-Gui Yao
Keyword(s):  
Early Devonian ◽  
Late Emsian

scholarly journals Early Devonian (Late Emsian) shark fin remains (Chondrichthyes) from the Paraná Basin, southern Brazil

2017 ◽  
Vol 89 (1) ◽  
pp. 103-118 ◽  
Author(s):  
MARTHA RICHTER ◽  
ELVIO P. BOSETTI ◽  
RODRIGO S. HORODYSKI
Keyword(s):  
Southern Brazil ◽  
Early Devonian ◽  
Paraná Basin ◽  
Parana Basin ◽  
Late Emsian

Early Devonian Spores from Central Ellesmere Island, Canadian Arctic

1974 ◽  
Vol 11 (1) ◽  
pp. 70-78 ◽  
Author(s):  
D. C. McGregor
Keyword(s):  
Canadian Arctic ◽  
Ellesmere Island ◽  
Early Devonian ◽  
Late Emsian

The Vendom Fiord Formation near the head of Cañon Fiord, central Ellesmere Island, hitherto thought to be unfossiliferous, contains mid to late Emsian trilete spores. Strata below the Vendom Fiord Formation, separated from it by an unconformity, contain a less diverse assemblage of spores that suggests a mid to late Gedinnian age. The spores are the only fossils known from these beds, and the first palynomorphs to be reported from the Early Devonian rocks of Ellesmere Island.

Microforaminiferal linings from the Early Devonian of eastern Australia, and their generic placement

1994 ◽  
Vol 68 (2) ◽  
pp. 200-207 ◽  
Author(s):  
Theresa Winchester-Seeto ◽  
K. N. Bell
Keyword(s):  
New South ◽  
New South Wales ◽  
Early Devonian ◽  
Wall Lining ◽  
South Wales ◽  
Eastern Australia ◽  
Late Emsian

Microforaminiferal linings assigned to 10 known genera have been recovered from Early Devonian (Lochkovian to Late Emsian) limestones from Victoria, New South Wales, and Queensland. These organic linings have been identified by comparison with normal-sized agglutinated foraminiferan genera known to occur in the associated sediments. Microforaminiferal linings with smooth walls and reticulate sculptured walls were present and the possible implications of these (diagenetic, relict structure, naked homeomorphs, or processing artifact) are discussed. Evidence is presented thatOrdovicinamay have a bilamellar organic wall lining.

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