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Sunwaptan

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Journal Article
Published: 30 May 2018
Journal of Paleontology (2018) 92 (5): 751–767.
... of trilobite ‘biomeres’ that correspond to North American stages, including those of the Sunwaptan and Skullrockian. Trilobites show a consistent pattern of recovery across these boundaries, and commonly each extinction and replacement of taxa is interpreted as a single event as changing environmental...
FIGURES
Journal Article
Published: 01 September 2013
Journal of Paleontology (2013) 87 (5): 804–817.
... interval in the Steptoean–Sunwaptan boundary interval (Furongian, Jiangshanian) of Nevada and Utah. In Nevada, both genera occur in a condensed bioclastic lag below a major flooding surface, and Kormagnostella also appears in a transgressive interval in Utah. Immigration of these genera is associated...
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Journal Article
Published: 30 August 2007
Canadian Journal of Earth Sciences (2007) 44 (7): 987–1003.
...Stephen R. Westrop; Jonathan M. Adrain Abstract Despite being reported widely from basal Sunwaptan strata, Dellea? punctata Palmer, 1965 , is known from only four figured cranidia. New material from Nevada, Utah and Oklahoma, including librigenae and pygidia, indicate that specimens assigned...
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Journal Article
Published: 01 November 2006
Journal of Paleontology (2006) 80 (6): 1152–1171.
...JONATHAN M. ADRAIN; STEPHEN R. WESTROP Abstract Trilobites previously assigned to the Entomaspididae Ulrich in Bridge, 1931 are common in Laurentian strata assigned to the upper Sunwaptan Stage of the Upper Cambrian. Most species are poorly known, and typically only sparse cranidial data...
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Journal Article
Published: 01 January 2005
Journal of Paleontology (2005) 79 (1): 72–88.
...STEPHEN R. WESTROP; ALLISON R. PALMER; ANTHONY RUNKEL Abstract A single bed at the base of the Jordan Sandstone in a road cut at Arcadia, Wisconsin, yielded an undescribed Late Sunwaptan ( Saukia Zone) trilobite fauna that includes at least four species from the families Dikelocephalidae Miller...
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Journal Article
Published: 19 November 2010
Geological Magazine (2011) 148 (4): 529–557.
...ED LANDING; STEPHEN R. WESTROP; BJÖRN KRÖGER; ADAM M. ENGLISH Abstract Two completely dissimilar faunal changes occur between the Sunwaptan and Skullrockian Stages (Ptychaspid and Symphysurid ‘Biomeres’) in the uppermost Cambrian on the east Laurentian craton. An undolomitized section in the Little...
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Correlation of zonations for the Steptoean–<b>Sunwaptan</b> boundary interval in L...
Published: 01 September 2013
Figure 2 Correlation of zonations for the Steptoean–Sunwaptan boundary interval in Laurentia (Nevada and Utah; Westrop and Adrain, 2007 ) and the Sackian of the Karatau-Naryn Terrane (Kazakhastan; Ergaliev and Ergaliev, 2008 ; Ergaliev et al., 2009 ), showing relative stratigraphic ranges
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Measured section from highest <b>Sunwaptan</b> and basal Skullrockian part of the ...
Published: 01 April 2012
F ig 8— Measured section from highest Sunwaptan and basal Skullrockian part of the Conococheague Formation. Peritidal cycles are shown with arrows; the rest of the section is possibly noncyclic. Cv  =  cover, Ss  =  Sandstone; Lm  =  planar microbial laminites; Rc  =  ribbon carbonate; Gr
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Trilobite biostratigraphy and lithostratigraphy of the Steptoean-<b>Sunwaptan</b> ...
Published: 30 August 2007
Fig. 2. Trilobite biostratigraphy and lithostratigraphy of the Steptoean-Sunwaptan boundary interval in east-central Nevada, western Utah and southern Oklahoma. All material described in this paper is from the Irvingella major Zone ( I. major ). Fm., Formation.
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Figure 2. Distribution of <b>Sunwaptan</b> data across a spectrum of five broad se...
in > Geology
Published: 01 October 2001
Figure 2. Distribution of Sunwaptan data across a spectrum of five broad sedimentary facies. A: Mean species richness of trilobites (rarefied to standard sample size of 90 individuals) in field collections from each facies (collections included are Sunwaptan part of data set of Westrop
Journal Article
Published: 01 July 2005
Geological Magazine (2005) 142 (4): 377–398.
...J. M. ADRAIN; S. R. WESTROP Abstract The Notch Peak Formation (Late Cambrian, Sunwaptan) of western Utah yields diverse silicified trilobite faunas that provide new information on the anatomy of many taxa. The family Ptychaspididae Raymond, 1924 , is represented by species of Keithiella Rasetti...
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Journal Article
Published: 01 March 2003
Journal of Paleontology (2003) 77 (2): 201–211.
... to the lower Sunwaptan (middle Late Cambrian). One new subfamily, Neotretinae, is erected, and two new species, Rhondellina albertensis , and Linnarssonella tubicula are described. Linnarssonella elongata Bell, 1941 , is reinstated as a valid species. This fauna occurs with a diverse fauna of paraconodont...
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Journal Article
Published: 12 March 2015
Geological Magazine (2015) 152 (6): 973–992.
... and winnowing of fossil rudstones, and pre-compactional fracture of the conglomerate and rudstones. Orusia rudstones in the succession below the conglomerate are regarded as analogues of Eoorthis and Billingsella rudstones in the ‘biomere’ extinction intervals of the Laurentian basal Sunwaptan. The lowest...
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Series: Memoir, Memoir
Published: 01 January 2012
DOI: 10.1306/13331494M983498
EISBN: 9781629810201
... been described nearly a century earlier by Roemer (1852) , Shumard (1861) , and Walcott (1890) . The base of the Sunwaptan Stage (Millardan Series) is placed at the base of the Irvingella major Subzone of the Elvinia Zone. The I. major Subzone is very thin, typically less than 6 ft (2 m...
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Series: Memoir, Memoir
Published: 01 January 2012
DOI: 10.1306/13331510M983509
EISBN: 9781629810201
... boundstone, lime mudstone, and mixed carbonate-siliciclastic facies assemblages that developed on a platform. The second and third successions are separated by an unconformity that spanned most of the Steptoean. The third succession includes mixed carbonate-siliciclastic strata and spans the Sunwaptan...
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Journal Article
Published: 24 February 2003
Canadian Journal of Earth Sciences (2003) 40 (2): 177–205.
... information assists correlation with Cambrian passive margin units in Quebec. Major sea-level lowstands are recognized along the continental margin in early–middle Late Cambrian (Steptoan) and in late Late Cambrian (Sunwaptan). Even if the Quebec succession can be tied with its Newfoundland correlative, some...
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Journal Article
Journal: Geology
Published: 01 June 2002
Geology (2002) 30 (6): 563–566.
... Vermont have been interpreted as highly condensed continental-slope deposits with a hiatus bracketed by the trilobite fauna of the Dunderbergia zone (Steptoean) and the Saukia zone (upper Sunwaptan). This interpretation was based on information from two thin fossiliferous intervals, the occurrence of one...
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Journal Article
Published: 01 March 2001
Journal of Paleontology (2001) 75 (2): 241–260.
...SEAN P. ROBSON; BRIAN R. PRATT Abstract Linguliform brachiopods were recovered from the Upper Cambrian Downes Point Member (lower Sunwaptan) and from the Middle Ordovician Factory Cove Member (Arenig) of the Shallow Bay Formation, Cow Head Group, of western Newfoundland. These rocks are a series...
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Journal Article
Published: 01 March 1999
Journal of Paleontology (1999) 73 (2): 326–336.
... be recognized immediately above the extinction horizon that defines the base of the Sunwaptan Stage. GeoRef, Copyright 2004, American Geological Institute. 1999 ...
Journal Article
Published: 01 May 1998
Journal of Paleontology (1998) 72 (3): 577–584.
...Ben R. Spincer Abstract The origin and affinity of the problematic Nuia Maslov is reappraised from exceptionally preserved specimens in Upper Cambrian (Sunwaptan) rocks of the Llano Uplift, central Texas. Nuia is suggested to be a radial calcitic ooid that has nucleated on fragments of reworked...