scholarly journals Late Triassic-earliest Jurassic geomagnetic polarity sequence and paleolatitudes from drill cores in the Newark rift basin, eastern North America

1995 ◽  
Vol 100 (B8) ◽  
pp. 14965-14998 ◽  
Author(s):  
D. V. Kent ◽  
P. E. Olsen ◽  
W. K. Witte
Keyword(s):  
North America ◽  
Late Triassic ◽  
Eastern North America ◽  
Rift Basin ◽  
Geomagnetic Polarity ◽  
Drill Cores

Description of the metoposaurid Anaschisma browni from the New Oxford Formation of Pennsylvania

2021 ◽  
pp. 1-18
Author(s):  
Bryan M. Gee ◽  
Steven E. Jasinski
Keyword(s):  
North America ◽  
American Southwest ◽  
Late Triassic ◽  
Eastern North America ◽  
Taxonomic Assignment ◽  
South Central ◽  
Central Regions ◽  
Voucher Specimens ◽  
Tetrapod Evolution ◽  
Eastern Seaboard

Abstract Metoposaurids are a widespread and ubiquitous constituent of Late Triassic non-marine paleoenvironments. In North America, this group is practically the only large-bodied temnospondyl clade, and is particularly well documented from the American southwest and south-central regions (Arizona, New Mexico, Texas). However, metoposaurids are poorly documented from eastern North America, with fragmentary, doubtfully diagnostic historical material such as “Dictyocephalus elegans” Leidy, 1856 and “Eupelor durus” Cope, 1866. The Zions View (early Norian?) locality in Pennsylvania preserves more-complete material, which previous workers noted as belonging to “Buettneria perfecta” Case, 1922 (=Anaschisma browni Branson, 1905). However, the material has never been described in a fashion that characterizes the anatomy or that justifies the taxonomic assignment, yet it would represent the most complete material in eastern North America and a substantial expansion of this taxon's geographic range. Here we redescribe the Zions View metoposaurid material in detail, differentiating it from Calamops paludosus Sinclair, 1917, the only other Late Triassic temnospondyl from the eastern seaboard, and demonstrating confident affinities with A. browni. Our study is the first to properly justify the taxonomic referral, underscoring the broader importance of proper documentation of voucher specimens, especially for potential geographic outliers. Anaschisma browni is thus the most widely dispersed metoposaurid. Its easternmost documentation underscores the importance of the undersampled and understudied metoposaurid record on the eastern seaboard for understanding the development of a metoposaurid zone of exclusivity in North America and demonstrates the need for further exploration to refine conceptualizations of Late Triassic tetrapod evolution.

scholarly journals High-resolution stratigraphy of the Newark rift basin (early Mesozoic, eastern North America)

1996 ◽  
Vol 108 (1) ◽  
pp. 40-77 ◽  
Author(s):  
Paul E. Olsen ◽  
Dennis V. Kent ◽  
Bruce Cornet ◽  
William K. Witte ◽  
Roy W. Schlische
Keyword(s):  
High Resolution ◽  
North America ◽  
Eastern North America ◽  
Rift Basin ◽  
Early Mesozoic

scholarly journals Implications of the Newark Supergroup-based astrochronology and geomagnetic polarity time scale (Newark-APTS) for the tempo and mode of the early diversification of the Dinosauria

2010 ◽  
Vol 101 (3-4) ◽  
pp. 201-229 ◽  
Author(s):  
Paul E. Olsen ◽  
Dennis V. Kent ◽  
Jessica H. Whiteside
Keyword(s):  
Late Triassic ◽  
Eastern North America ◽  
Early Diversification ◽  
Chinle Formation ◽  
Distinct Genus ◽  
Low Diversity ◽  
Geomagnetic Polarity ◽  
Newark Supergroup ◽  
Geomagnetic Polarity Time Scale ◽  
Newark Basin

ABSTRACTThe Newark-APTS established a high-resolution framework for the Late Triassic and Early Jurassic. Palaeomagnetic polarity correlations to marine sections show that stage-level correlations of continental sequences were off by as much as 10 million years. New U–Pb ages show the new correlations and the Newark basin astrochronology to be accurate. Correlation of Newark-APTS to the Chinle Formation/Dockum Group, Glen Canyon Group, Fleming Fjord Formation and Ischigualasto Formation led to the following conclusions: (1) there are no unequivocal Carnian-age dinosaurs; (2) the Norian Age was characterised by a slowly increasing saurischian diversity but no unequivocal ornithischians; (3) there was profound Norian and Rhaetian continental provinciality; (4) the classic Chinle-, Germanic- and Los Colorados-type assemblages may have persisted to the close of the Rhaetian; (5) the distinct genus-level biotic transition traditionally correlated with the marine Carnian–Norian is in fact mid-Norian in age and within published error of the Manicouagan impact; (6) the end-Triassic marine and continental extinctions as seen in eastern North America were contemporaneous; and (7) compared to Triassic communities, Hettangian and Sinemurian age terrestrial communities were nearly globally homogenous and of low diversity. Consequently, the complex emerging picture of dinosaur diversification demands biostratigraphically-independent geochronologies in each of the faunally-important regions.

Rift-basin development: lessons from the Triassic–Jurassic Newark Basin of eastern North America

2012 ◽  
Vol 369 (1) ◽  
pp. 301-321 ◽  
Author(s):  
M. O. Withjack ◽  
R. W. Schlische ◽  
M. L. Malinconico ◽  
P. E. Olsen
Keyword(s):  
North America ◽  
Eastern North America ◽  
Rift Basin ◽  
Basin Development ◽  
Newark Basin
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