The Early Devonian eurypterid Leiopterella tetliei from Arctic Canada

2021 ◽  
pp. 1-7
Author(s):  
Simon J. Braddy ◽  
Jason A. Dunlop ◽  
Joseph A. Bonsor
Keyword(s):  
Polarized Light ◽  
Arctic Canada ◽  
Early Devonian ◽  
Basal Position

The stylonurid eurypterid Leiopterella tetliei Lamsdell, Braddy, Loeffler, and Dineley, 2010 (Chelicerata: Eurypterida: Rhenopteridae) from the Early Devonian (Lochkovian) of Nunavut in Arctic Canada is redescribed. Restudy of the holotype under polarized light revealed a labrum, epistomal sutures, prosomal appendage III, and deltoid plates anterior to the genital appendage. An additional new specimen preserves the distal podomeres of appendage VI and gradually tapering opisthosomal tergites. The characters resolved here support the hypothesis that L. tetliei was relatively basal within the wider Stylonurina clade, with its tapering postabdomen supporting a more basal position within Rhenopteridae than previously suggested.

Early Devonian stylonurine eurypterids from Arctic Canada (project)

10.7934/p541 ◽  
2014 ◽  
Author(s):  
C Lamsdell ◽  
J Braddy ◽  
J Loeffler ◽  
L Dineley
Keyword(s):  
Arctic Canada ◽  
Early Devonian

Early Devonian stylonurine eurypterids from Arctic Canada [X1285] (matrix)

10.7934/x1285 ◽  
2014 ◽  
Author(s):  
C Lamsdell ◽  
J Braddy ◽  
J Loeffler ◽  
L Dineley
Keyword(s):  
Arctic Canada ◽  
Early Devonian

Early Devonian eurypterids from the Northwest Territories of Arctic Canada

2000 ◽  
Vol 37 (8) ◽  
pp. 1167-1175 ◽  
Author(s):  
Simon J Braddy ◽  
Jason A Dunlop
Keyword(s):  
Northwest Territories ◽  
Marine Environment ◽  
Plant Material ◽  
Canadian Arctic ◽  
Arctic Canada ◽  
Early Devonian ◽  
Rock Formation

A new eurypterid fauna from the Lower Bear Rock Formation (Early Devonian, Emsian) of Anderson River, in the Northwest Territories of the Canadian Arctic, is described. The material comprises an almost complete specimen and five isolated carapaces of Erieopterus microphthalmus; an incomplete carapace and telson referred to Drepanopterus sp.; and an isolated prosomal appendage of Carcinosoma sp. Associations include actinopterygian, sarcopterygian, and acanthodian fish, as well as lingulids, conchostracans, ostracodes, coprolites, and plant material. A nearshore marine environment is inferred. This assemblage provides the first Canadian record of Drepanopterus and the youngest Canadian occurrences of erieopterid and carcinosomatid eurypterids.

Early Devonian stylonurine eurypterids from Arctic Canada

2010 ◽  
Vol 47 (11) ◽  
pp. 1405-1415 ◽  
Author(s):  
James C. Lamsdell ◽  
Simon J. Braddy ◽  
Elizabeth J. Loeffler ◽  
David L. Dineley
Keyword(s):  
Depositional Environment ◽  
Northern Coast ◽  
Arctic Canada ◽  
Early Devonian ◽  
Large Size

Two new stylonurine eurypterids are described from the Peel Sound Formation (Early Devonian, Lochkovian) of the northern coast of Prince of Wales Island, Nunavut, Arctic Canada. Associations including pteraspids and ostracodes indicate a fluvial depositional environment. An almost complete stylonurid, Pagea plotnicki sp. nov., is recognized by its large size and lack of vaulting on the carapace, and it provides evidence that Stylonurus and Pagea are sister-taxa. Also, a smaller incomplete rhenopterid assigned to Leiopterella tetliei gen. et sp. nov., is characterized by its broad turbinate carapace and lack of cuticular sculpture. This assemblage provides the first Canadian record of Pagea, and the youngest occurrence of a rhenopterid outside the Rheno-Hercynian Terrane, indicating that these taxa were more geographically widespread than previously supposed.

The role of contemporaneous faulting on Late Silurian sedimentation in the eastern M'Clintock Basin, Prince of Wales Island, Arctic Canada

1986 ◽  
Vol 23 (9) ◽  
pp. 1401-1411 ◽  
Author(s):  
Paul S. Mortensen ◽  
Brian Jones
Keyword(s):  
Carbonate Platform ◽  
Fold Belt ◽  
Arctic Canada ◽  
Early Devonian ◽  
Eastern Margin ◽  
Basement Faults ◽  
Somerset Island ◽  
East West

During the Late Silurian, the eastern margin of the M'Clintock Basin was the site of slow sedimentation on a relatively stable carbonate platform. It is apparent, however, that contemporaneous (syndepositional) faults segmented this basin into several quasi-independent subbasins during deposition of the Cape Storm, Douro, and Somerset Island formations. Differential subsidence of these subbasins played a major role in controlling sedimentation patterns and stratigraphie thickness. These subbasins may have been sustained into the Early Devonian, as is evident from the facies of the overlying Peel Sound Formation. The east–west orientated, reactivated basement faults bounding the subbasins served as zones of weakness during the development of the Cornwall is Fold Belt and are evident in the present-day outcrop.

Middle Devonian brachiopods from the Bird Fiord Formation, Arctic Canada

2003 ◽  
Vol 77 (2) ◽  
pp. 243-266 ◽  
Author(s):  
Li Rong-Yu ◽  
Brian Jones
Keyword(s):  
New Species ◽  
Middle Devonian ◽  
Canadian Arctic ◽  
Ellesmere Island ◽  
The Arctic ◽  
Arctic Canada ◽  
Early Devonian ◽  
Delta Plain ◽  
The Cross

The late Early Devonian to Middle Devonian Bird Fiord Formation, which is up to 900 m thick, is exposed along an extensive outcrop belt from stretches from Ellesmere Island to Bathurst Island in Arctic Canada. This formation, which encompasses sediments that accumulated in sabkha, deltaic, and shelf settings, is divided into six members. The Blubber Point, Baad Fiord, Norwegian Bay, and Cardigan Strait members, which include sediments that formed on an open marine shelf, are characterized by a diverse biota of brachiopods, mollusks, corals, trilobites, and sponges. The Cross Bay and Grise Fiord members, which encompass sediments that formed in a sabkha and delta plain settings, respectively, are generally devoid of fossils.A collection of 47,026 brachiopods, which came from 140 collections made at 34 locations throughout the outcrop belt of the Bird Fiord Formation, contains 22 species of brachiopods that belong to 21 genera. This biota includes six new species: Gypidula mega, Spinatrypa (Isospinatrypa) parva, Desquamatia (Independatrypa) fortis, Nucleospira stelcki, Warrenella grinnellensis, and Cranaena briceae. Four genera (Arcticastrophia Li and Jones, 2002, Borealistrophia Li and Jones, 2002, Grinnellathyris Li and Jones, 2002, and Costacranaena Johnson and Perry, 1976) and 16 species of brachiopods are endemic to the Arctic Canada. Conversely, the fauna also includes European elements such as Nucleospira lens (Schnur), Spinatrypa (Isospinatrypa), and Warrenella. These taxa may indicate that there was some communication between the Canadian Arctic and Europe during Middle Devonian.

The allochthonous origin of the reefal facies of the Stuart Bay Formation (Early Devonian), Bathurst Island, arctic Canada

1984 ◽  
Vol 21 (6) ◽  
pp. 657-668 ◽  
Author(s):  
Kevin P. Polan ◽  
Colin W. Stearn
Keyword(s):  
Deep Water ◽  
Lower Devonian ◽  
Linear Groups ◽  
Fold Belt ◽  
Arctic Canada ◽  
Catastrophic Events ◽  
Early Devonian ◽  
Bedding Planes ◽  
Reefal Facies ◽  
Reef Tract

Blocks of limestone and dolomite up to tens of metres across occur near the base of the Lower Devonian (Siegenian–Emsian) Stuart Bay Formation at six sites on eastern Bathurst Island. These blocks occur in groups of up to 30. At the two localities with the greatest number of blocks they are disposed in two or three roughly linear groups reflecting their occurrence on bedding planes. The blocks are mostly wackestones and floatstones and they contain abundant fossils of the reefal biofacies of which stromatoporoids and corals are most prominent.The blocks have weathered from a matrix of finely laminated deep-water siltstone. Most of the blocks are unbedded but where bedding attitudes can be measured they are discordant with that of the siltstone and those of neighbouring blocks. Although they have been described as bioherms that grew in place, the evidence indicates that they are allochthonous blocks derived when several catastrophic events such as earthquakes disturbed a Devonian reef tract developed on the western flank of the Cornwallis Fold Belt.

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