Two new pre-trilobite faunas from western North America

Signor, Philip W.; McMenamin, Mark A. S.; Gevirtzman, Debra A.; Mount, Jeffrey F.

doi:10.1038/303415a0

Cited by 35 publications

(17 citation statements)

References 12 publications

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“…Wyattia, a small, mineralized cone of unknown affinity, is found in the upper Reed Dolomite (Taylor, 1966). Signor et al (1983) reported Cambrian-aspect small shelly fossils from the basal Deep Spring Formation. However, Grant (1990) reinterpreted the small shelly fossils (and possibly Wyattia) as Cloudina, a terminal Neoproterozoic index fossil.…”

Section: The White-inyo Successionmentioning

confidence: 98%

Using Chemostratigraphy to Correlate and Calibrate Unconformities in Neoproterozoic Strata from the Southern Great Basin of the United States

Corsetti

Awramik

Pierce

et al. 2000

International Geology Review

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An integrative approach combining carbon-isotope stratigraphy, biostratigraphy, and sequence stratigraphy was used to correlate between and place tentative age constraints on previously undated Neoproterozoic-Cambrian units of the Death Valley and White-Inyo successions, southern Great Basin, United States. Two regionally correlatable disconformities have been identified in the poorly fossiliferous, pre-trilobite strata. By comparing the carbon-isotope trends in the succession to a hypothetical global reference curve, the temporal magnitude of each hiatus can be postulated. The younger hiatus approaches 30 m.y. in duration and separates strata (Hines Tongue/basal Stirling unconformity) between 580 Ma and 550 Ma. The older hiatus represents ~10 m.y. and separates strata (Wyman-Reed and upper Johnnie unconformity) between ~590 and 580 Ma. The unconformi ties may be related to global sea-level fluctuations in response to Neoproterozoic ("Snowball Earth") glacial events or tectonic activity as predicted by thermal subsidence models, and as such, may provide critical data to evaluate these global phenomena.

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Section: The White-inyo Successionmentioning

confidence: 98%

Using Chemostratigraphy to Correlate and Calibrate Unconformities in Neoproterozoic Strata from the Southern Great Basin of the United States

Corsetti

Awramik

Pierce

et al. 2000

International Geology Review

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“…Although several species of Sinotubulites have been erected to date, their distinctness is unclear. Specimens from the Yangtze Gorges area in China (Chen et al, 1981;Ding et al, 1985Ding et al, , 1993 and from the North American localities (Signor et al, 1983(Signor et al, , 1987McMenamin, 1985) are generally poorly preserved and relatively uninformative regarding morphological details. The best preserved material to date comes from the Shaanxi Province, China (Hua et al, 2000;Chen et al, 2008;Cai et al, 2010Cai et al, , 2015Sun et al, 2012), and illustrates a highly variable population, particularly regarding the ornamentation of the outer wall.…”

Section: Description Of Cloudina and Sinotubulitesmentioning

confidence: 97%

“…Occurrences of Sinotubulites are relatively rare and always associated with Cloudina. Until now Sinotubulites had been found in two areas: (1) in South China, in several localities of the Dengying Formation (Chen et al, 2008;Cai et al, 2015;see below), and (2) in south-west North America, in the Deep Spring Formation at Mount Dunfee, Nevada (Signor et al, 1983(Signor et al, , 1987, and in the La Cienega Formation, Sonora, Mexico (McMenamin, 1985). Sinotubulites has been recently reported from the Ibor Group in the Abenójar Anticline, Ciudad Real Province (Zhuravlev et al, 2012).…”

Section: Description Of Cloudina and Sinotubulitesmentioning

confidence: 97%

“…Grotzinger et al, 2000;Hofmann and Mountjoy, 2001;Amthor et al, 2003;Kontorovich et al, 2008), while Sinotubulites is known from South China, Mexico and western USA (e.g. Signor et al, 1983Signor et al, , 1987McMenamin, 1985;Chen et al, 2008;Cai et al, 2015). The reason for this is not known and, in general, the structure and composition of these late Ediacaran ecosystems is relatively poorly known.…”

Section: Introductionmentioning

confidence: 93%

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Late Ediacaran skeletal body fossil assemblage from the Navalpino anticline, central Spain

Cortijo¹,

Mus²,

Jensen³

et al. 2015

Precambrian Research

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“…Great Basin (after Nelson, 1962Nelson, , 1976Stewart, 1970;Fedo and Cooper, 2001 Nelson, 1976Nelson, , 1978Mount et al, 1983;Signor et al, 1983;Gevirtzman and Mount, 1986;Signor and Mount, 1986;Droser and Bottjer, 1988;Corsetti and Kaufman, 1994;Fritz, 1995;Hagadorn and Bottjer, 1999;. Because the PC-C boundary paradigm has changed over the last three decades, the inferred position of the boundary in the succession has changed as well.…”

Section: Figure 4 Generalized Lithostratigraphic Columns For the Pc-mentioning

confidence: 99%

The Precambrian-Cambrian Transition in the Southern Great Basin, USA

Corsetti¹,

Hagadorn²

2003

TSR

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The Precambrian-Cambrian boundary presents an interesting stratigraphic conundrum: the trace fossil used to mark and correlate the base of the Cambrian, Treptichnus pedum, is restricted to siliciclastic facies, whereas biomineralized fossils and chemostratigraphic signals are most commonly obtained from carbonate-dominated sections. Thus, it is difficult to correlate directly between many of the Precambrian-Cambrian boundary sections, and to assess details of the timing of evolutionary events that transpired during this interval of time. Thick sections in the White-Inyo region of eastern California and western Nevada, USA, contain mixed siliciclastic-carbonate lithofacies, and therefore promote correlation between these classic, well-studied lithologic end-members. An integrated stratigraphic approach was applied to the White-Inyo succession, combining lithologic, paleontologic, and chemostratigraphic data, in order to address the temporal framework within the basin, and to facilitate worldwide correlation of the boundary. Results from the southern Great Basin demonstrate that the negative δ13C excursion that is ubiquitous in carbonate-dominated successions containing small shelly fossils occurs within stratigraphic uncertainty of the first occurrence of T. pedum. This global geochemical marker thus provides a link with the primary biostratigraphic indicator for the Precambrian-Cambrian boundary.

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Two new pre-trilobite faunas from western North America

Cited by 35 publications

References 12 publications

Using Chemostratigraphy to Correlate and Calibrate Unconformities in Neoproterozoic Strata from the Southern Great Basin of the United States

Using Chemostratigraphy to Correlate and Calibrate Unconformities in Neoproterozoic Strata from the Southern Great Basin of the United States

Late Ediacaran skeletal body fossil assemblage from the Navalpino anticline, central Spain

The Precambrian-Cambrian Transition in the Southern Great Basin, USA

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