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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...
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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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Correlation of zonations for the Steptoean–<span class="search-highlight">Sunwaptan</span> 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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Figure  7. Stage-level pattern of evenness and biodiversity in the Cambrian...
Published: 01 January 2004
Figure 7. Stage-level pattern of evenness and biodiversity in the Cambrian and Ordovician. Lines connecting the Steptoean and Sunwaptan and the Sunwaptan and Arenigian stages are dashed to indicate the unconstrained nature of the Sunwaptan data. Gray points are individual samples; mean sample
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Measured section from highest <span class="search-highlight">Sunwaptan</span> 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-<span class="search-highlight">Sunwaptan</span> ...
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 <span class="search-highlight">Sunwaptan</span> data across a spectrum of five broad se...
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
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Figure  8. Evenness pattern in whole assemblages including non-benthic taxa...
Published: 01 January 2004
and Sunwaptan and the Sunwaptan and Arenigian stages are dashed to indicate the unconstrained nature of the Sunwaptan data (see text). Timescale abbreviations as in Figure 7
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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FIGURE 2 —Time series of assemblage-level genus richness. (A) Face-value ri...
Published: 01 December 2006
= Sunwaptan; Aren = Arenigian; Car = Caradocian; Ash = Ashgillian. Sunwaptan mean richness is more poorly constrained than others (see text for further explanation)
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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Columnar section of Opohonga Limestone with sampling interval, stratigraphi...
Published: 01 May 2016
Fig. 2.— Columnar section of Opohonga Limestone with sampling interval, stratigraphic classification and correlation with Sauk III and IV sequences. Abbreviations: CAMB.=Cambrian; Sunwap.=Sunwaptan.
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Figure  2 —Trilobite species range charts for the Imler Quarry and Drab-Bea...
Published: 01 May 2004
Figure 2 —Trilobite species range charts for the Imler Quarry and Drab-Beaverton measured sections. Range data from Drab-Beaverton are revised from Loch and Taylor (1995 , fig. 3). Abbreviations: P ., Parabolinoides ; P. m ., Pseudosaratogia magna ; S., Sunwaptan; T ., Taenicephalus .
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FIGURE 3 —Field photograph of a columnar-branched thrombolite. Note the ran...
Published: 01 April 2000
FIGURE 3 —Field photograph of a columnar-branched thrombolite. Note the randomly oriented dark grey mesoclots (most with pockets of secondary white coarse dolomite), ragged margins of the columns, and parallel branching. From the Smoky Member of the Nopah Formation (Lower Sunwaptan Stage, Upper
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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... the Proconodontus tenuiserratus Zone (Cambrian System, Sunwaptan Stage) through the Rossodus manitouensis Zone (Ordovician System, upper Skullrockian Stage). The base of the Ordovician System in the Llano uplift, as elsewhere, has been identified by the lowest occurrence of the conodont Iapetognathus...
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