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

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.

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.

Early Devonian calymenid larvae (Trilobita) from the Bissounel Formation (Montagne Noire, France)

2007 ◽  
Vol 178 (3) ◽  
pp. 197-200 ◽  
Author(s):  
Rudy Lerosey-Aubril
Keyword(s):  
Larval Stage ◽  
Morphological Characteristics ◽  
Developmental Strategy ◽  
Two Stage ◽  
Early Devonian ◽  
Montagne Noire ◽  
Middle Member ◽  
Planktonic Larval Stage ◽  
Late Emsian ◽  
Comparable Size

AbstractThe late Emsian middle Member of the Bissounel Formation (Montagne Noire, France) has yielded a highly diverse silicified trilobite fauna. Among the thousands of disarticulated sclerites discovered, two protaspid specimens were found that display morphological characteristics of planktonic larvae of calymenid trilobites. The presence of calymenid protaspides within a non-calymenid trilobite fauna is noted. The two specimens are very similar to the first planktonic larval stage of the Ordovician Flexicalymene senaria (Conrad, 1841), and are of comparable size. This indicates that, as in F. senaria, a second planktonic larval stage might have occurred in the ontogeny of this undetermined calymenid. Thus, some post-Ordovician calymenids might have retained the ancestral developmental strategy with a two-stage planktonic period. The discovery of these two protaspides constitutes the first evidence of a calymenid trilobite in the Devonian of the Montagne Noire.

scholarly journals Possible polychaete tube worms from the Late Emsian (Early Devonian) of the Parana Basin, Brazil

2015 ◽  
Author(s):  
Olev Vinn ◽  
CAROLINA ZABINI ◽  
GUSTAVO SENE-SILVA ◽  
KALLE KIRSIMÄE ◽  
Lara Marcos
Keyword(s):  
Early Devonian ◽  
Tube Worms ◽  
Paraná Basin ◽  
Parana Basin ◽  
Late Emsian
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