Stratigraphic setting of the type specimen of Carpocrinus arcticus Frest and Strimple from the Late Silurian of Somerset Island, Arctic Canada

1977 ◽  
Vol 14 (9) ◽  
pp. 2168-2168 ◽  
Author(s):  
Guy M. Narbonne
Keyword(s):  
Type Specimen ◽  
Arctic Canada ◽  
Somerset Island ◽  
Upper Boundary

The type specimen of Carpocrinus arcticus Frest and Strimple was collected approximately 65 m below the upper boundary of the Read Bay Formation (Member A) at Fury Point, Somerset Island. Associated brachiopods, trilobites, and bryozoans suggest a Ludlovian age for this specimen.

Atrypoidea zonation of the Upper Silurian Read Bay Formation of Somerset and Cornwallis Islands, Arctic Canada

1979 ◽  
Vol 16 (12) ◽  
pp. 2204-2218 ◽  
Author(s):  
Brian Jones
Keyword(s):  
Carbonate Rocks ◽  
Basal Part ◽  
Arctic Canada ◽  
Pressure Point ◽  
Species Overlap ◽  
Conodont Zone ◽  
Upper Silurian ◽  
Somerset Island ◽  
Cornwallis Island ◽  
Distinct Distribution

Species of the brachiopod genus Atrypoidea have a distinct distribution in carbonate rocks of the late Silurian Read Bay Formation of Arctic Canada. Atrypoidea phoca occurs in the basal part of the formation and this species is succeeded by Atrypoidea foxi forma B at higher levels. The ranges of the two species overlap, defining a third useful zone. Locally, as in the Pressure Point area of northwestern Somerset Island, Atrypoidea foxi forma B is succeeded by Atrypoidea foxi forma A. Atrypoidea foxi forma A is generally restricted to carbonates with a low content of detrital material and has a significantly larger shell than Atrypoidea foxi forma B. A higher zone is defined by Atrypoidea erebus which occurs in the basal part of the Somerset Island Formation on Somerset Island and in the basal part of member C of the Read Bay Formation at Goodsir Creek on Cornwallis Island. At the latter locality, Atrypoidea foxi forma A is found with Atrypoidea erebus, thereby demonstrating their overlapping ranges.The overlapping ranges of Atrypoidea phoca and Atrypoidea foxi forma B occur in the middle to late Ludlovian ploeckensis–siluricus conodont zones. On Somerset Island, Atrypoidea foxi forma B and Atrypoidea foxi forma A range through the ploeckensis–siluricus conodont zone. Atrypoidea erebus occurs in late Ludlovian and (or) early Pridolian strata.

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.

Paleosalinity and dolomitization of a Lower Paleozoic carbonate sequence, Somerset and Prince of Wales Islands, Arctic Canada

1978 ◽  
Vol 15 (9) ◽  
pp. 1448-1461 ◽  
Author(s):  
Ján Veizer ◽  
Jean Lemieux ◽  
Brian Jones ◽  
Martin R. Gibling ◽  
Jim Savelle
Keyword(s):  
Trace Element ◽  
Arctic Canada ◽  
Lower Paleozoic ◽  
Trace Element Study ◽  
Carbonate Sequence ◽  
Somerset Island ◽  
Carbonate Formations ◽  
Element Study

Trace element study of Lower Paleozoic carbonate formations on Somerset and Prince of Wales Islands (Arctic Canada) suggests the following interpretation: (1) Na contents of the formations studied reflect the paleosalinities of their depositional and (or) early diagenetic environments; (2) K is not suitable as a paleosalinity indicator; (3) the post-Allen Bay limestones studied were probably originally (bio)chemical aragonitic muds associated with environments having hypersaline tendencies; (4) Sr distribution of penecontemporaneous – early diagenetic dolostones (Cape Storm, Somerset Island, Peel Sound Formations) suggests that they are replacements of aragonitic muds, frequently in hypersaline settings; (5) the late diagenetic dolostones (Lang River and Allen Bay Formations) are probably hyposaline replacements of CaCO3 precursors deficient in high-Sr aragonite; aragonite may have undergone diagenetic transformation into calcite prior to dolomitization.

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