Sequence-Stratigraphy of Early-Middle Cambrian Grand Cycles in the Carrara Formation, Southwest Basin and Range, California and Nevada

Adams, Roy D.

doi:10.1007/978-94-015-8583-5_10

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…The Carrara Formation comprises cycles of silty marl and limestone with a trilobite fauna spanning the Bonnia-Olenellus to the Glossopleura zones, and thus the Series 2 -Series 3 boundary (Adams, 1995;Palmer and Halley, 1979;Sundberg and McCollum, 2000;Babcock et al, 2012;Keller et al, 2012;Fig. 3).…”

Section: Emigrant Passmentioning

confidence: 99%

Trilobite extinctions, facies changes and the ROECE carbon isotope excursion at the Cambrian Series 2–3 boundary, Great Basin, western USA

Faggetter

Wignall

Pruss

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Emigrant Passmentioning

confidence: 99%

Trilobite extinctions, facies changes and the ROECE carbon isotope excursion at the Cambrian Series 2–3 boundary, Great Basin, western USA

Faggetter

Wignall

Pruss

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The Carrara Formation is a regionally extensive, relatively shallow-water, mixed carbonate-siliciclastic unit of lower to middle Cambrian (Dyeran to Delamaran; Bonnia-Olenellus Biozone to Glossopleura Biozone) age in southern Nevada and southeastern California ( Fig. 1A ; Barnes & Palmer, 1961 ; Barnes, Christiansen & Byers, 1962 ; Palmer & Halley, 1979 ; Adams, 1995 ; Webster, 2011 ; Harwood Theisen & Sumner, 2016 ). It consists of mixed carbonate and siliciclastic sediments and varies in thickness between 300–500 m ( Adams & Grotzinger, 1996 ; Keller, Lehnert & Cooper, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Disc-shaped fossils resembling porpitids or eldonids from the early Cambrian (Series 2: Stage 4) of western USA

Lieberman

Kurkewicz²,

Shinogle

et al. 2017

PeerJ

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The morphology and affinities of newly discovered disc-shaped, soft-bodied fossils from the early Cambrian (Series 2: Stage 4, Dyeran) Carrara Formation are discussed. These specimens show some similarity to the Ordovician Discophyllum Hall, 1847; traditionally this taxon had been treated as a fossil porpitid. However, recently it has instead been referred to as another clade, the eldonids, which includes the enigmatic Eldonia Walcott, 1911 that was originally described from the Cambrian Burgess Shale. The status of various Proterozoic and Phanerozoic taxa previously referred to porpitids and eldonids is also briefly considered. To help ascertain that the specimens were not dubio- or pseudofossils, elemental mapping using energy dispersive X-ray spectroscopy (EDS) was conducted. This, in conjunction with the morphology of the specimens, indicated that the fossils were not hematite, iron sulfide, pyrolusite, or other abiologic mineral precipitates. Instead, their status as biologic structures and thus actual fossils is supported. Enrichment in the element carbon, and also possibly to some extent the elements magnesium and iron, seems to be playing some role in the preservation process.

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“…The Carrara Formation is a regionally extensive, relatively shallow-water, mixed carbonate-siliciclastic unit of lower to middle Cambrian (Dyeran to Delamaran; Bonnia-Olenellus Biozone to Glossopleura Biozone) age in southern Nevada and southeastern California ( Fig. 1A; Barnes & Palmer, 1961;Barnes, Christiansen & Byers, 1962;Palmer & Halley, 1979;Adams, 1995;Webster, 2011;Harwood Theisen & Sumner, 2016). It consists of mixed carbonate and siliciclastic sediments and varies in thickness between 300-500m (Adams & Grotzinger, 1996;Keller, Lehnert & Cooper, 2012).…”

Section: Geology and Paleoenvironmentmentioning

confidence: 99%

“…The Echo Shale Member was deposited in a lagoonal environment and is dominated by shales and siliceous mudstones, interbedded with silt-and sandstone beds; it is thickest in the Striped Hills area and thins out to the northwest (Palmer & Halley, 1979;Adams 1995). It lies within the Bolbonelellus euryparia Biozone (Webster, 2011), overlays the Thimble Limestone Member, and in turn is overlain by the Gold Ace Limestone Member (Fig.…”

Section: Geology and Paleoenvironmentmentioning

confidence: 99%

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Supplemental Information 1: SEM Image and Spectra of KUMIP 389538

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The morphology and affinities of newly discovered disc-shaped soft-bodied fossils from the early Cambrian (Series 2: Stage 4, Dyeran) Carrara Formation are discussed. These specimens show some similarity to the Ordovician Discophyllum Hall, 1847; traditionally this taxon had been treated as a fossil porpitid. However, recently it has instead been referred to another clade, the eldonids, which includes the enigmatic Eldonia Walcott, 1911 that was originally described from the Cambrian Burgess Shale. The status of various Proterozoic and Phanerozoic taxa previously referred to porpitids and eldonids is also briefly considered. To help ascertain that the specimens were not dubio-or pseudofossils, elemental mapping using energy dispersive X-ray spectroscopy (EDS) was conducted. This, in conjunction with the morphology of the specimens, indicated that the fossils were not hematite, iron sulfide, pyrolusite, or other abiologic mineral precipitates. Instead, their status as biologic structures and thus actual fossils is supported. Enrichment in the element carbon, and also possibly to some extent the elements magnesium and iron, seems to be playing some role in the preservation process.

show abstract

Sequence-Stratigraphy of Early-Middle Cambrian Grand Cycles in the Carrara Formation, Southwest Basin and Range, California and Nevada

Cited by 6 publications

References 22 publications

Trilobite extinctions, facies changes and the ROECE carbon isotope excursion at the Cambrian Series 2–3 boundary, Great Basin, western USA

Trilobite extinctions, facies changes and the ROECE carbon isotope excursion at the Cambrian Series 2–3 boundary, Great Basin, western USA

Disc-shaped fossils resembling porpitids or eldonids from the early Cambrian (Series 2: Stage 4) of western USA

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