Middle Carboniferous and Early Permian Fusulinaceans from the Monkman Pass area, northeastern British Columbia

1978 ◽  
Author(s):  
C A Ross ◽  
E W Bamber
Keyword(s):  
British Columbia ◽  
Early Permian ◽  
Middle Carboniferous

Early Permian colonial rugose corals from the Stikine River area, British Columbia, Canada

1989 ◽  
Vol 63 (2) ◽  
pp. 158-181 ◽  
Author(s):  
Calvin H. Stevens ◽  
Barbara Rycerski
Keyword(s):  
British Columbia ◽  
New Species ◽  
Lower Permian ◽  
Early Permian ◽  
Klamath Mountains ◽  
Coral Fauna ◽  
Rugose Corals ◽  
Two New Species ◽  
Three New Species ◽  
One New Species

Twenty-two species of Early Permian colonial rugose corals belonging to 12 genera from 10 locations in the Stikine River area in northwestern British Columbia, Canada, are described. These include three new species ofFomichevella(F. magna, F. southeri, F. bamberi); two species ofHeintzella; five species ofHeritschioides, of which three are new (H. bagleyae, H. garvinae, H. hoganae); two new species ofParaheritschioides(P. jennyi, P. wickenae); one new species questionably assigned toKleopatrina(K.?stikinensis); two new species ofPetalaxis(P. guaspariniae, P. neriae); and two new species ofLytvophyllum(L.?mongeri, L. wersoni). In addition, five new species assigned to five new genera are here namedEastonastraea complexa, Fedorowskiella simplex, Pararachnastraea lewisi, Stikineastraea thomasi, andWilsonastraea rigbyi.These corals occur in rocks forming part of the Stikine terrane, the largest tectonostratigraphic unit in western Canada. This coral fauna shows a very close affinity with that of the Lower Permian McCloud Limestone of the eastern Klamath Mountains of northern California, and there is some similarity to the Coyote Butte fauna of central Oregon. Several species compare most closely with species from Spitsbergen, but there are few similarities with any cratonal North American faunas and none with Tethyan faunas.

Allochthonous Permian micro- and macrofauna, Kamloops area, British Columbia

1985 ◽  
Vol 22 (3) ◽  
pp. 442-451 ◽  
Author(s):  
Samuel J. Nelson ◽  
Eric R. Nelson
Keyword(s):  
British Columbia ◽  
Western Hemisphere ◽  
Island Arc ◽  
Late Permian ◽  
Early Permian ◽  
Tabulate Coral

The first waagenophyllid coral to be described from the Western Hemisphere has been found in Permian rocks of the "Harper Ranch Group," near Kamloops, southern British Columbia. It is Parawentzelella?(Miyagiella) johnstonae sp. nov., associated with the tabulate coral Multithecopora?larushi sp. nov., numerous brachiopods, and other fossils. The containing rocks are considered to be allochthonous, originating in the western part of the Paleopacific Tethyan Ocean or in an island-arc complex farther to the north.The outcrop yielding the fossils appears to be a stratigraphic misfit, both in age and origin. Fusulinids from adjacent areas are of Early Permian (Wolfcampian) age but those associated with the fossils indicate a Late Permian (Guadalupian) age. These conflicting dates cannot, at present, be reconciled. The Tethyan origin of the fauna also contrasts with that of surrounding rocks, which are "non-Tethyan."

Facies interpretation of Middle Carboniferous to Lower Permian Pope succession limestone of Cache Creek Group, Fort St. James, central British Columbia

2001 ◽  
Vol 38 (4) ◽  
pp. 535-550 ◽  
Author(s):  
H Sano ◽  
L Rui
Keyword(s):  
British Columbia ◽  
Lower Permian ◽  
Facies Association ◽  
Basaltic Rocks ◽  
Facies Associations ◽  
Reefal Facies ◽  
Middle Carboniferous ◽  
Shallow Subtidal ◽  
Phylloid Algae ◽  
Lower Slope

Lithostratigraphy and microfacies of the Bashkirian to Asselian Pope succession limestone of the Cache Creek Group near Fort St. James, central British Columbia, were lithologically grouped into five facies associations A to E. On the basis of fusulines and conodonts, facies associations A to D and the lower part of facies association E are time-equivalent, ranging from the lower Bashkirian to lower Kasimovian, and the upper part of facies association E is dated as upper Gzhelian to Asselian. The Pope succession limestone is interpreted to have been built on a basaltic basement of an oceanic plateau or seamount in an open-ocean realm. The limestone is devoid of terrigenous grains, is associated with basaltic rocks, and laterally grades into deeper-water spicular cherts. Microfacies analysis of facies associations A to E showed that they exhibit characteristic facies of (A) deep-water basinal setting, (B) marginal basin to lower slope, (C) shallow-subtidal bank margin, (D) peritidal algal mound on the bank margin, and (E) shallow-subtidal bank margin to intertidal lagoonal flat,. Moscovian to Asselian rocks of facies associations C, D, and E record an upward increase of low-relief encrusting calci-microbes as rock-builders. This tendency is closely correlated with that in limestone buildups mapped from the Panthalassan Ocean. The abundance of phylloid algal plates and the reefal facies of the Moscovian rocks of facies association D are the same as the reef-building phylloid algae of the Bashkirian to Sakmarian limestone of both the Tethyan and Panthalassan oceans. The Pope succession limestone has many similarities in tectonic, stratigraphic, sedimentologic, and paleontologic aspects to the Akiyoshi buildup, a representative Panthalassan buildup in a Permian subduction-related accretionary complex in Japan. The timing of the increasing importance of the calci-microbes and phylloid algae in the Pope and Akiyoshi buildups is also correlatable.

scholarly journals Structural analysis of superposed fault systems of the Bornholm horst block, Tornquist Zone, Denmark.

2009 ◽  
Vol 57 ◽  
pp. 25-49 ◽  
Author(s):  
Ole Graversen
Keyword(s):  
Middle Triassic ◽  
Three Dimensional ◽  
Crystalline Basement ◽  
Early Permian ◽  
Dolerite Dyke ◽  
Fault Systems ◽  
Fault Block ◽  
Middle Carboniferous ◽  
Dyke Injection ◽  
Early Palaeozoic

The Bornholm horst block is composed of Precambrian crystalline basement overlain by Palaeozoic and Mesozoic cover rocks. The cover intervals are separated by an angular unconformity and a hiatus spanning the Devonian through Middle Triassic interval. Late Palaeozoic faulting of the Early Palaeozoic Baltica platform is correlated with early-middle Carboniferous deformation in the Variscan foreland and with faulting associated with dolerite dyke injection in Skåne in the Late Carboniferous – Early Permian. The Palaeozoic fault systems are striking NW-SE and WNW-ESE and the platform series are dipping towards the SE and ESE respectively. The Mesozoic faulting was associated with the development of a horst-graben framework in the Bornholm-Skåne segment of the Sorgenfrei-Tornquist Zone. Mesozoic fault subsidence started in the Rønne Graben in the Triassic. In the Jurassic the Arnager-Sose block became active, cut off from the Bornholm block; in addition the Læså Graben (new) and the Øle Å fault block complex (new) were cut into the central Bornholm block from the south. In the Late Cretaceous the central Bornholm block was perforated by isolated fault blocks, i.e. the Nyker block, the Bøsthøj block and the Lobbæk block (new) along with subsidence of the Holsterhus block and renewed subsidence of the Arnager-Sose block. The Mesozoic series are dipping towards the southwest. The Palaeozoic fault systems were associated with two-dimensional plane strain during ENE-WSW and NNE-SSW extension. By contrast the Jurassic and Cretaceous fault systems were associated with three-dimensional strain with maximum extension striking NE-SW and secondary extension striking NW-SE. The Mesozoic palaeostress fields were associated with the break down of the Pangea supercontinent.

U–Pb and K–Ar dates related to the timing of magmatism and deformation in the Cache Creek terrane and Quesnellia, southern British Columbia

1990 ◽  
Vol 27 (1) ◽  
pp. 117-123 ◽  
Author(s):  
N. Mortimer ◽  
P. van der Heyden ◽  
R. L. Armstrong ◽  
J. Harakal
Keyword(s):  
British Columbia ◽  
Early Cretaceous ◽  
North American ◽  
Late Jurassic ◽  
Early Jurassic ◽  
Early Permian ◽  
Magmatic Arc ◽  
Plutonic Complex ◽  
Minimum Age ◽  
Coast Plutonic Complex

U–Pb dating of zircon from the Guichon Creek batholith indicates an emplacement age of 210 ± 3 Ma. Comparison with previously published K–Ar (211–188 Ma) and Rb–Sr (205 and 196 Ma) dates reveals that intrusion, mineralization, cooling, and uplift of the batholith took some 20 Ma, spanning the Triassic–Jurassic boundary on the Decade of North American Geology (DNAG) time scale.The Mount Martley pluton and Tiffin Creek stock yield Late Jurassic dates of 155 ± 2 Ma (U–Pb, zircon) and 152 ± 5 Ma (K–Ar, hornblende), respectively, and provide a reliable minimum age (Kimmeridgian) for penetrative deformation in the Cache Creek terrane. K–Ar whole-rock dates from Cache Creek terrane and Ashcroft Formation argillites range from Early Permian (266 ± 8 Ma) and Early Jurassic (194 ± 6 Ma) to Late Jurassic, Kimmeridgian (154 ± 5 Ma). We interpret the younger dates as recording Middle–Late Jurassic tectonism and the older ones as possible relics from earlier deformation episodes.An Early Cretaceous K–Ar date (129 ± 5 Ma) for a lamprophyre dike that cuts the Nicola Group suggests that the Early Cretaceous magmatic arc of the Coast Plutonic Complex had an eastern alkalic fringe in the Intermontane Belt.

Fusulinids from piston cores, Northwind Ridge, Amerasia Basin, Arctic Ocean

1997 ◽  
Vol 71 (3) ◽  
pp. 357-360 ◽  
Author(s):  
Calvin H. Stevens ◽  
Charles A. Ross
Keyword(s):  
Arctic Ocean ◽  
Canadian Arctic ◽  
The Arctic ◽  
Early Permian ◽  
Ural Mountains ◽  
Upper Paleozoic ◽  
The Arctic Ocean ◽  
Middle Carboniferous ◽  
Northwind Ridge ◽  
Shelf Margin

Fusulinaceans from the flank of Northwind Ridge in the Arctic Ocean indicate that this feature is underlain by miogeoclinal upper Paleozoic strata, and that the fauna belongs to the Middle Carboniferous through Early Permian Arctic Fusulinacean Province. This province stretched from the Canadian Arctic Islands eastward to Svalbard where it merged with the similar Ural Fusulinacean Province in the western Ural Mountains. Because these provinces did not extend into Siberia, the Northwind Ridge assemblage indicates that these rocks originally were adjacent to, or a part of, the Canadian Arctic Islands Carboniferous-Permian shelf margin.

Globally significant Early Permian crinoids from the Mount Mark Formation in Strathcona Provincial Park, Vancouver Island, British Columbia — preliminary analysis of a disappearing fauna

2009 ◽  
Vol 46 (9) ◽  
pp. 663-674 ◽  
Author(s):  
G. D. Webster ◽  
James W. Haggart ◽  
Carrie Saxifrage ◽  
Barry Saxifrage ◽  
Christian Gronau ◽  
...  
Keyword(s):  
British Columbia ◽  
North America ◽  
North American ◽  
Preliminary Analysis ◽  
Vancouver Island ◽  
Early Permian ◽  
New Genera ◽  
Wrangellia Terrane ◽  
Provincial Park ◽  
Future Reference

Strata of the Mount Mark Formation, Buttle Lake Group, exposed in the vicinity of Marble Peak in Strathcona Provincial Park, central Vancouver Island, contain a diverse Early Permian crinoid fauna. This is the first Permian fauna containing crowns and cups recognized from Wrangellia terrane. The fauna contains representatives of each of the major Paleozoic crinoid subclasses: Camerata, Disparida, and Cladida. Specimens were observed and photographed between 2004 and 2008. No specimens were collected in adherence to regulations of Stratcona Provincial Park. Preliminary identifications recognize several new genera and species within the fauna, but they are not named or described lacking specimens for repository. A minimum of 24 species are judged to be in the fauna, making it the second most diverse Permian fauna known from North America. Identified genera suggest a greater relationship to North American faunas than to Paleotethyan faunas, suggesting Wrangellia was closer to North America than to the Paleotethyan realm during Early Permian time. Exposures of the Mount Mark Formation in the vicinity of Marble Peak are undergoing karstification, and specimens are being lost under the harsh weathering conditions. Observations of individual specimens over a five-year interval found that morphologic details critical for identification are being lost at an alarming rate. It is recommended that sufficient specimens in the fauna should be collected as soon as possible for identification and analysis. These specimens should be preserved for future reference and could form an educational display in the Strathcona Provincial Park headquarters.

Preliminary paleomagnetic results from the Permian Asitka Group, British Columbia

1987 ◽  
Vol 24 (7) ◽  
pp. 1490-1497 ◽  
Author(s):  
E. Irving ◽  
J. W. H. Monger
Keyword(s):  
British Columbia ◽  
North American ◽  
Early Permian ◽  
Poor Agreement ◽  
The South ◽  
The North ◽  
Latitudinal Position ◽  
The Mean ◽  
North American Craton

Tuffs, rhyolites, and basalts collected at seven sites (25 samples) in the Early Permian Asitka Group of Stikinia have similar paleomagnetic inclinations, and corresponding paleolatitudes of 23 ± 6, 21 ± 4, and 23 ± 5 °respectively. Both polarities occur, so the paleolatitudes could be either north or south of the paleoequator, although the polarity bias favours the former option. The paleolatitude expected for the sampling region is 27 ± 4°N. Adopting the paleomagnetically more probable northern option, the mean displacement relative to the North American craton is 5 ± 6°, indicating that Stikinia was in much the same latitudinal position relative to the craton during the Early Permian as it is at present, although possibly somewhat to the south. The declinations are in poor agreement, indicating that relative rotations occurred in this faulted terrane.

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