Data from: Chancelloriid sclerites from the Dyeran–Delamaran (lower–middle Cambrian) boundary interval of the Pioche–Caliente region, Nevada, USA
Data files
Dec 04, 2019 version files 3.01 GB
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Appendix.xls
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occurrence data.csv
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specimen list.csv
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Supplementary images from sample GSp 12.5.zip
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Supplementary images from sample GSp 28.6.zip
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Supplementary images from sample GSp 59.4.zip
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Supplementary images from sample HV 11.9.zip
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Supplementary images from sample HV 12.1.zip
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Supplementary images from sample HV 25.8.zip
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Supplementary images from sample HV 52.7.zip
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Supplementary images from sample HV 56.15.zip
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Supplementary images from sample ICS 10004.zip
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Supplementary images from sample ICS 10555.zip
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Supplementary images from sample ICS 1099.zip
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Supplementary images from sample ICS 1265.zip
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Supplementary images from sample ICS 1289.zip
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Supplementary images from sample KGC 40.9.zip
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Supplementary images from sample KGC 44.85.zip
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Supplementary images from sample KGC 44.95.zip
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Supplementary images from sample KGC 54.6.zip
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Supplementary images from sample LCC 26.5.zip
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Supplementary images from sample LCC 42.0.zip
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Supplementary images from sample OSS 0.35.zip
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Supplementary images from sample OSS 30.05.zip
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Supplementary images from sample OSS 30.3.zip
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Supplementary images from sample OSS 53.05.zip
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Supplementary images from sample OSS 54.1.zip
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Supplementary images from sample OW 1.7.zip
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Supplementary images from sample OW 1.92.zip
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Supplementary images from sample OW 2.5.zip
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Supplementary images from sample OW 27.8.zip
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Supplementary images from sample OW 3.25.zip
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Supplementary images from sample OW 34.0.zip
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Supplementary images from sample OW 34.2.zip
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Supplementary images from sample OW 34.3.zip
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Supplementary images from sample RW 14.78.zip
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Supplementary images from sample RW 24.3.zip
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Supplementary images from sample SB 3.7.zip
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Supplementary images from sample SB 5.3.zip
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Supplementary images from sample SOS 25.1.zip
Abstract
Chancelloriids are a poorly understood group of phylogenetically problematic Cambrian metazoans; complete specimens show they were sessile, radially symmetric, club-shaped organisms covered with sclerites in the form of rosettes of spines. While isolated sclerites are common components of Cambrian shelly assemblages, they have been relatively little studied. We describe chancelloriid sclerites from a series of nine sections spanning the upper Dyeran (uppermost traditional ‘lower’ Cambrian of Laurentia) to lower Delamaran (lowermost traditional ‘middle’ Cambrian) stages from the Pioche–Caliente region of east-central Nevada, USA. Samples were collected from the Combined Metals, Comet Shale, and Susan Duster Limestone members of the Pioche Formation on a bed-by-bed basis; acid maceration yielded more than 2000 sclerites. Based on careful examination of these sclerites and statistical analyses of co-occurring sclerite types, we distinguish six species, five of them new, and each with a restricted stratigraphic range. Chancelloria impar Moore sp. nov. is the dominant species in most upper Dyeran samples. Archiasterella cometensis Moore sp. nov. and A. auriculata Moore sp. nov. are rare in the upper Dyeran but widespread in the lowest Delamaran; A. uncinata Moore sp. nov. and C. lilioides Moore sp. nov. replace these in younger samples. A. auriculata is noteworthy for sharing features with both Archiasterella and Chancelloria, two of the more common chancelloriid genera. These results provide further support for the taxonomic tractability and biostratigraphic utility of chancelloriid sclerites; large collections from single horizons allow intraspecific variability to be assessed and species to be distinguished.