scholarly journals Geology of Cornwallis Island and Neighbouring Smaller Islands, Canadian Arctic Archipelago, District of Franklin, Northwest Territories

1988 ◽  
Author(s):  
R Thorsteinsson
Keyword(s):  
Northwest Territories ◽  
Canadian Arctic ◽  
Canadian Arctic Archipelago ◽  
Cornwallis Island

Reassessment of Ischnacanthus? scheii Spjeldnaes (Acanthodii, Ischnacanthiformes) from the latest Silurian or earliest Devonian of Ellesmere Island, arctic Canada

2013 ◽  
Vol 50 (9) ◽  
pp. 945-954 ◽  
Author(s):  
Carole J. Burrow
Keyword(s):  
Canadian Arctic ◽  
Biological Species ◽  
Ellesmere Island ◽  
Canadian Arctic Archipelago ◽  
Devon Island ◽  
Thin Sectioning ◽  
Bone Fragments ◽  
Cornwallis Island ◽  
North Greenland ◽  
Fin Spines

Articulated specimens of jawed fishes, and assemblages of disarticulated elements that can be assigned to a single biological species, are extremely rare from pre-Devonian deposits. The acanthodian species Ischnacanthus? scheii Spjeldnaes is based on a monospecific assemblage, comprising fin spines, dentigerous jaw bone fragments and scales, from the ?Siluro-Devonian boundary beds of the Devon Island Formation in central west Ellesmere Island, Canadian Arctic Archipelago, Nunavut. A new examination of the type material, in particular by scanning electron microscopy and thin sectioning of scales, shows that the species is a porosiform poracanthodid that is now assigned to Radioporacanthodes scheii comb. nov. Scales of the same species are also recognized from the upper Pridoli of Cornwallis Island and the ?Pridoli or Lochkovian of north Greenland.

Silurian (Wenlockian) trilobites from Baillie-Hamilton Island, Canadian Arctic Archipelago

1977 ◽  
Vol 14 (2) ◽  
pp. 285-317 ◽  
Author(s):  
D. G. Perry ◽  
B. D. E. Chatterton
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
New Taxa ◽  
Canadian Arctic ◽  
Canadian Arctic Archipelago ◽  
Cape Phillips Formation ◽  
Mackenzie Mountains

Wenlockian trilobites representing at least 15 genera are reported from carbonate strata within the Cape Phillips Formation, Baillie-Hamilton Island. The collections are stratigraphically bounded by the graptolite Zones of Cyrtograptus murchisoni and Monograptus testis. The fauna is generically dominated by lichids, odontopleurids, and cheirurids. Scutelluids, phacopids, dalmanitids, and harpids are notable for their absence. At the familial level the fauna corresponds to one recently discovered from similar age beds of the Mackenzie Mountains, Northwest Territories. The limited quantity and fragmental nature of much of the silicified fauna precludes erection of many new taxa, although four new species described are: Sphaerexochus dimorphus, Dicranogmus skinneri, Hemiarges rohri, and Hemiarges mikulici. Dimorphic pygidia are interpreted as probable sexual dimorphs in Sphaerexochus dimorphus n. sp.

The coral Thuliocyclus prominens n. gen. and sp. (Rugosa: Palaeocyclidae) from the Upper Silurian of the Canadian Arctic Archipelago

1986 ◽  
Vol 60 (1) ◽  
pp. 53-60
Author(s):  
William G. Parkins
Keyword(s):  
New Genus ◽  
Canadian Arctic ◽  
Morphological Characteristics ◽  
Good Growth ◽  
Canadian Arctic Archipelago ◽  
Growth Series ◽  
Coral Genus ◽  
Rugose Coral ◽  
Upper Silurian ◽  
Cornwallis Island

Twenty-two specimens of Thuliocyclus prominens, a new palaeocyclid rugose coral genus and species, on a loose slab presumably from the lower Pridolian Barlow Inlet Formation at Cape Rescue on Cornwallis Island, Northwest Territories, Canada, provide a good growth series from neanic to ephebic stages. The new genus shares morphological characteristics with both typical Silurian Palaeocyclidae and more advanced Devonian Hadrophyllidae.

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