Early Middle Ordovician Conodonts of North Atlantic Province from northeastern Ellesmere Island, Arctic Canada

1978 ◽  
Author(s):  
R S Tipnis
Keyword(s):  
North Atlantic ◽  
Ellesmere Island ◽  
Arctic Canada ◽  
Middle Ordovician ◽  
Atlantic Province

scholarly journals Bioestratigrafía y provincialismo de conodontes del tramo medio-superior de la Formación San Juan en el cerro Viejo de Huaco, Precordillera, Argentina

2018 ◽  
Vol 45 (2) ◽  
pp. 274 ◽  
Author(s):  
Matías J. Mango ◽  
Guillermo L. Albanesi
Keyword(s):  
North Atlantic ◽  
Species Level ◽  
San Juan ◽  
Insufficient Information ◽  
Entire Interval ◽  
Middle Ordovician ◽  
The North ◽  
Atlantic Province ◽  
The North Atlantic ◽  
Color Alteration

The present study deals with the conodont biostratigraphy from the middle and upper parts of the San Juan Formation (Lower-Middle Ordovician) exposed at the Los Gatos creek section, west of the cerro Viejo de Huaco, Central Precordillera of San Juan Province. The numerous conodonts recovered, corresponding to 55 species, allow to recognize a series of biozones in the studied section. The biostratigraphic analysis carried out herein allows determining associations of conodonts assignable to the Oepikodus evae, Oepikodus intermedius, Baltoniodus triangularis-Tripodus laevis and Lenodus variabilis zones that correspond to the middle Floian to lower Darriwilian. The Baltoniodus navis and Microzarkodina parva zones were not identified due to insufficient information provided by this stratigraphic section. In general, the levels corresponding to the Baltoniodus triangularis-Tripodus laevis Zone contain more conodonts, than the records of other localities from Precordillera. These specimens are well preserved with a color alteration index (CAI) of 2-2.5, indicating overburden paleotemperatures ranging from 60° and 155° C. The large presence of fragmented conodonts, with recrystallized surfaces and crystal overgrowth, could indicate the effect of distinctive diagenetic fossil processes on the bearer limestone. The analysis of the diversity and abundance of genera and species of conodonts by chronostratigraphic intervals presents a great percentage of cosmopolitan taxa, 18% and 38% in common, at species level, only with the North-American Midcontinent Province (NAMP), and with a small percentage with the North-Atlantic Province (NAP) and the Precordillera, which allows to approximate a greater paleobiogeographic affinity of the conodonts recovered with those of the NAMP than those of the NAP for the entire interval studied. On the other hand, the Precordillera is verified as a province with its own characteristics as identified by several authors.

scholarly journals The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank

2019 ◽  
Vol 176 (6) ◽  
pp. 1093-1106 ◽  
Author(s):  
Scott Jess ◽  
Randell Stephenson ◽  
Søren B. Nielsen ◽  
Roderick Brown
Keyword(s):  
North Atlantic ◽  
Baffin Island ◽  
Arctic Canada

Permian Sponges from Western Ellesmere Island, Arctic Canada

1973 ◽  
Vol 10 (9) ◽  
pp. 1431-1443 ◽  
Author(s):  
J. Keith Rigby ◽  
Forrest M. Terrell
Keyword(s):  
Ellesmere Island ◽  
Arctic Canada ◽  
New Family

Sponges occur widespread in Permian formations in western Ellesmere Island on Fosheim, Raanes, and Bjorne Peninsulas. Scheiia tuberosa Tschernyschew and Stepanov, 1916, is described from the Assistance and Tanquary formations and is the most widely occurring sponge in the collections. Haplistion arcticum (Dunikowski, 1884), Haplistion latituba (Dunkowski, 1884), Haplistion diactinum n. sp., and Raanespongia monilis, n. gen. and n. sp., all occur in the Assistance Formation. Raanespongia monilis n. sp. is the basis of the new family Raanespongiidae which is included in the Eutaxicladina.

New occurrences of Oldhamia and other trace fossils in the Cambrian of the Yukon and Ellesmere Island, arctic Canada

1994 ◽  
Vol 31 (5) ◽  
pp. 767-782 ◽  
Author(s):  
H. J. Hofmann ◽  
M. P. Cecile ◽  
L. S. Lane
Keyword(s):  
North America ◽  
Western Europe ◽  
Trace Fossils ◽  
Trace Fossil ◽  
Ellesmere Island ◽  
Early Cambrian ◽  
Arctic Canada ◽  
North Central ◽  
Middle Cambrian ◽  
New Occurrences

Trace fossil assemblages from green and maroon argillites at 34 localities in the British Mountains and Barn Mountains of northernmost Yukon, and 3 localities in the Grant Land Formation of northern Ellesmere Island contain abundant Planolites spp., Oldhamia curvata, Oldhamia flabellata, and Oldhamia radiata, and rare Oldhamia antiqua, Oldhamia? wattsi (n.comb.), Bergaueria hemispherica, Cochlichnus sp., Didymaulichnus? sp., Helminthoidichnites sp., Monomorphichnus sp., Protopaleodictyon sp., and Tuberculichnus? sp. Additionally, 11 new sites in the Selwyn Mountains of north-central Yukon have yielded an ichnofauna including Helminthorhaphe sp., O. curvata, O. flabellata, O. radiata, Plagiogmus? sp., Planolites spp., and unidentified small hemispherical traces. All these assemblages are interpreted as Early Cambrian to early Middle Cambrian, based on comparison with Oldhamia-bearing ichnofaunas of similar age in North America, Argentina, and western Europe, and on archaeocyathids and olenellids in overlying units.

Application of 3D Laser Scanning to the Preservation of Fort Conger, a Historic Polar Research Base on Northern Ellesmere Island, Arctic Canada

ARCTIC ◽  
2013 ◽  
Vol 66 (2) ◽  
Author(s):  
Peter C. Dawson ◽  
Margaret M. Bertulli ◽  
Richard Levy ◽  
Chris Tucker ◽  
Lyle Dick ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Ellesmere Island ◽  
3D Laser Scanning ◽  
Arctic Canada
Sign in / Sign up

Export Citation Format

Share Document