The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance: Reply

1982 ◽  
Vol 19 (8) ◽  
pp. 1709-1709
Author(s):  
V. S. Papezik ◽  
S. M. Barr
Keyword(s):  
Nova Scotia ◽  
Early Mesozoic

First record of the early Mesozoic sphenodontian Clevosaurus (Lepidosauria: Rhynchocephalia) from the Southern Hemisphere

1995 ◽  
Vol 69 (1) ◽  
pp. 123-126 ◽  
Author(s):  
Hans-Dieter Sues ◽  
Robert R. Reisz
Keyword(s):  
Nova Scotia ◽  
Southern Hemisphere ◽  
Southern Africa ◽  
First Record ◽  
Lower Jurassic ◽  
Early Jurassic ◽  
Red Beds ◽  
Early Mesozoic

An incomplete skull of a small sphenodontian lepidosaur from the upper part of the Stormberg Group of southern Africa is referable to Clevosaurus Swinton, 1939. It is most closely related to C. bairdi from the McCoy Brook Formation (Lower Jurassic) of Nova Scotia (Canada) and C. mcgilli from the Dark Red Beds of the Lower Lufeng Formation (Lower Jurassic) of Yunnan (China). The new specimen is important because it represents the first record of Clevosaurus from the Southern Hemisphere. Like many other taxa of Early Jurassic continental tetrapods (crocodylomorph archosaurs, dinosaurs, synapsids), Clevosaurus had an apparently Pangaean distribution.

scholarly journals Donald Baird and his discoveries of Carboniferous and early Mesozoic vertebrates in Nova Scotia

2013 ◽  
Vol 49 ◽  
pp. 90 ◽  
Author(s):  
Hans-Dieter Sues ◽  
Robert W. Hook ◽  
Paul E. Olsen
Keyword(s):  
Nova Scotia ◽  
Vertebrate Paleontology ◽  
Late Paleozoic ◽  
Scientific Career ◽  
Early Mesozoic

Donald Baird (1926–2011), an influential and innovative vertebrate paleontologist with a scientific career spanning nearly 50 years, had an exceptional breadth of expertise in the study of late Paleozoic and Mesozoic vertebrates and their life traces. Beginning in 1956, Baird conducted fieldwork in the Carboniferous and Triassic-Jurassic of Nova Scotia, making a total of 21 trips in 30 years. His many scientific contributions include the discoveries of important assemblages of Carboniferous vertebrates as well as an unexpectedly diverse record of early Mesozoic tetrapods and their trackways in the province. Baird also encouraged and supported fieldwork by other vertebrate paleontologists as well as amateurs in Nova Scotia and elsewhere. His career-long commitment to the vertebrate paleontology of the province was instrumental in establishing it as an important source of fossils of Carboniferous and early Mesozoic continental vertebrates.RÉSUMÉDonald Baird (1926–2011), paléontologiste des vertébrés influent et novateur dont la carrière scientifique s’est échelonnée sur près de 50 ans, a acquis un savoir-faire exceptionnel dans l’étude des vertébrés du Paléozoïque tardif et du Mésozoïque et des vestiges de leur vie. À partir de 1956, M. Baird a mené des études sur le terrain du Carbonifère et du Trias-Jurassique en Nouvelle-Écosse, où il s’est rendu au total 21 fois en 30 ans. Ses nombreuses contributions scientifiques comprennent notamment les découvertes d’importants assemblages de vertébrés du Carbonifère ainsi que d’un nombre étonnamment diversifié de tétrapodes du Mésozoïque inférieur et de leurs traces dans la province. M. Baird a en outre encouragé et soutenu les études sur le terrain d’autres paléontologistes des vertébrés et d’amateurs du domaine en Nouvelle-Écosse et ailleurs. Pendant toute sa carrière, il s’est consacré à la paléontologie des vertébrés de la province, ce qui a contribué à la réputation de la Nouvelle-Écosse en tant que source importante de fossiles de vertébrés continentaux du Carbonifère et du Mésozoïque inférieur. 

The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance

1981 ◽  
Vol 18 (8) ◽  
pp. 1346-1355 ◽  
Author(s):  
V. S. Papezik ◽  
Sandra M. Barr
Keyword(s):  
New Jersey ◽  
Nova Scotia ◽  
Advanced Stage ◽  
Calcic Plagioclase ◽  
Southwestern Part ◽  
Dike Swarm ◽  
Early Mesozoic ◽  
Avalon Peninsula

A diabase dike about 140 km long (the Shelburne dike) cuts in a northeasterly direction across the southwestern part of Nova Scotia. The dike, recently dated at 201 Ma, forms part of a major Appalachian system of diabase dikes and basaltic flows of early Mesozoic age, emplaced during the first stages of opening of the present Atlantic Ocean.The Shelburne dike is tholeiitic and quartz normative. Its chemistry resembles that of the Palisade sill of New Jersey, but differs substantially from the more primitive magnesian composition of a similar dike on the Avalon Peninsula of Newfoundland. A more advanced stage of differentiation is reflected also in the composition of its main minerals (augite, pigeonite, zoned orthopyroxene, calcic plagioclase). Such chemical variations among the roughly contemporaneous diabase dikes of the northern Appalachians complicate the existing petrogenetic and tectonic models of the development of the Appalachian dike swarm.

scholarly journals Remnants of Early Mesozoic basalt of the Central Atlantic Magmatic Province in Cape Breton Island, Nova Scotia, Canada

2017 ◽  
Vol 54 (4) ◽  
pp. 345-358 ◽  
Author(s):  
Chris E. White ◽  
Daniel J. Kontak ◽  
Garth J. DeMont ◽  
Douglas Archibald
Keyword(s):  
Nova Scotia ◽  
Tectonic Setting ◽  
Geochemical Data ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Early Mesozoic ◽  
Central Atlantic Magmatic Province ◽  
Zeolite Formation ◽  
Newark Supergroup ◽  
Central Atlantic

Amygdaloidal basaltic flows of the Ashfield Formation were encountered in two drill holes in areas of positive aeromagnetic anomalies in the Carboniferous River Denys Basin in southwestern Cape Breton Island, Nova Scotia. One sample of medium-grained basalt yielded a plateau age of 201.8 ± 2.0 Ma, similar to the U–Pb and 40Ar/39Ar crystallization ages from basaltic flows and dykes in the Newark Supergroup. A second sample of zeolite-bearing basalt yielded a discordant age spectrum and a younger age of ca. 190 Ma, which is interpreted to date a widespread hydrothermal event related to zeolite formation. Whole-rock chemical data show that the Ashfield Formation basalt is low-Ti continental tholeiite, consistent with its within-plate tectonic setting. Chemically, it resembles basaltic flows in the Mesozoic Fundy and Grand Manan basins exposed in southern Nova Scotia and eastern New Brunswick and elsewhere in Central Atlantic Magmatic Province (CAMP). The age and geochemical data from the Ashfield Formation provide the first evidence for early Mesozoic CAMP volcanism in Cape Breton Island and demonstrate that the event was more widespread in Nova Scotia than previously thought, which has implications for its continuity and extent elsewhere within CAMP.

The Avalon Magnetic Lineament—A Possible Continuation of the Triassic Dike System of New Brunswick and Nova Scotia

1975 ◽  
Vol 12 (2) ◽  
pp. 332-335 ◽  
Author(s):  
V. S. Papezik ◽  
J. P. Hodych ◽  
A. K. Goodacre
Keyword(s):  
Nova Scotia ◽  
Atlantic Ocean ◽  
New Brunswick ◽  
Grenville Province ◽  
Early Mesozoic ◽  
Avalon Peninsula

A magnetic lineament that cuts across the Avalon Peninsula lies on strike with the Shelburne Dike of Nova Scotia and may represent a northeasterly extension of a system of early Mesozoic dikes and basalts associated with the opening of the Atlantic Ocean. An alternative, but less likely, possibility is that the Avalon Lineament is related to Cambrian dike systems cutting rocks of the Grenville Province.

North Mountain basalt from Digby, Nova Scotia: models for a fissure eruption from stratigraphy and petrochemistry

1988 ◽  
Vol 25 (1) ◽  
pp. 74-83 ◽  
Author(s):  
V. S. Papezik ◽  
John D. Greenough ◽  
John A. Colwell ◽  
Terry J. Mallinson
Keyword(s):  
Nova Scotia ◽  
Fissure Eruption ◽  
Chemical Diversity ◽  
Early Mesozoic ◽  
High K ◽  
Granular Matrix ◽  
Crystal Settling ◽  
Lower Crustal ◽  
Crustal Magma ◽  
Zoned Plagioclase

The early Mesozoic, quartz normative, North Mountain basalts in southwestern Nova Scotia (Digby area) form three units: a coarse massive lower flow (~190 m) bearing minor lenses of mafic pegmatite, a middle unit of thin amygdaloidal basaltic flows (~50 m), and an upper flow unit of massive phenocryst-rich basalt (~160 m). The two thick units show phenocrysts of orthopyroxene (bronzite) and (or) pigeonite, augite, and zoned plagioclase in a granular matrix of augite, pigeonite, and plagioclase. Variation diagrams and chondrite-normalized rare-earth-element patterns relate all chemical diversity between and within flows to removal and (or) accumulation of plagioclase and pyroxene phenocrysts (~1:1). High K, Rb, and Ba, appear related to assimilation of continental crust. Constancy of fractionation-independent element ratios and variations in phenocryst content vertically and along the 200 km strike of the basalts suggest (1) crystal settling and accumulation together with assimilation and mixing in a lower crustal magma chamber, (2) rise to upper crustal levels in a central conduit followed by northeast-ward emplacement along a tension-induced dyke system, and (3) extrusion along a fissure in two major and numerous minor pulses that formed the lower, upper, and middle units. Assimilation did not occur as magma moved through the dyke system, for assimilation-related variations in composition do not occur along strike.

First record of the tritylodontid cynodont Oligokyphus and cynodont postcranial bones from the McCoy Brook Formation of Nova Scotia, Canada

2015 ◽  
Vol 52 (4) ◽  
pp. 244-249 ◽  
Author(s):  
Tim J. Fedak ◽  
Hans-Dieter Sues ◽  
Paul E. Olsen
Keyword(s):  
Nova Scotia ◽  
North America ◽  
Geographic Distribution ◽  
First Record ◽  
Upper Triassic ◽  
Early Jurassic ◽  
Eastern North America ◽  
Taxonomic Identification ◽  
Early Mesozoic ◽  
Wide Geographic Distribution

A fragment of a right dentary with one postcanine tooth from the Upper Triassic (Rhaetian) Scots Bay Member of the McCoy Brook Formation at Wasson Bluff, Nova Scotia, Canada, represents the first record of the tritylodontid cynodont Oligokyphus from the early Mesozoic of eastern North America. In addition, three dissociated postcranial bones from the same horizon and locality are referable to derived cynodont therapsids. One of these elements, a nearly complete right humerus, can be assigned to Tritylodontidae. Two other bones, an ulna and incomplete ischium, belong to indeterminate derived cynodonts but show no features allowing more precise taxonomic identification. The presence of Oligokyphus in the McCoy Brook Formation provides additional evidence for the remarkably wide geographic distribution of many latest Triassic and Early Jurassic continental tetrapods.

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