Chancelloriida Walcott, 1920 y Reticulosa Reid, 1958 del Cámbrico medio de San José de Gracia, Sonora, México

Cuen, Francisco J.; Beresi, Matilde Sylvia; Montijo, A.; Buitrón, Blanca Estela; Minjárez, I.; Palafox, Juan José

doi:10.18268/bsgm2013v65n3a11

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…The units present in the El Chihuarruita Hill, in ascending order, are: Proveedora, Buelna, Cerro Prieto and El Gavilán formations (Figures 2 and 3). This Cambrian sequence has been previously discussed by Maytorena-Silva et al (1990), Almazán-Váz-quez (2002), Nardin et al (2009), Cuen (2012, Cuen et al (2012), and Cuen et al (2013).…”

Section: Lithostratigraphysupporting

confidence: 72%

Cambrian Stratigraphy of San José de Gracia, Sonora, Mexico: El Gavilán Formation, a new lithostratigraphic unit of middle Cambrian open shelf environment

Cuen-Romero

Valdez-Holguín²,

Buitrón

et al. 2016

BSGM

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Section: Lithostratigraphysupporting

confidence: 72%

Cambrian Stratigraphy of San José de Gracia, Sonora, Mexico: El Gavilán Formation, a new lithostratigraphic unit of middle Cambrian open shelf environment

Cuen-Romero

Valdez-Holguín²,

Buitrón

et al. 2016

BSGM

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“…2016); 14, Combined Metals Member, Pioche Formation, east‐central Nevada (Wotte & Sundberg 2017; this paper); 15, Comet Shale Member, Pioche Formation, east‐central Nevada (Wotte & Sundberg 2017; this paper); 16, Susan Duster Limestone Member, Pioche Formation, east‐central Nevada (Wotte & Sundberg 2017; this paper); 17, Ledger Formation, Pennsylvania (Walcott 1920; Stose & Jonas 1933); 18, El Gavilán Formation, ( Mexicella mexicana Zone), Sonora (Cuen et al . 2013; Cuen‐Romero et al . 2016); 19, Ross Lake Shale Member, Cathedral Formation, British Columbia (Walcott 1917); 20, Mount Cap Formation, Mackenzie Mountains, Northwest Territories (Butterfield & Nicholas 1996); 21, Arrojos Formation, Sonora (Cooper et al .…”

Section: Discussionmentioning

confidence: 99%

“…1952; Elliott & Martin 1987; possibly Walcott 1917; Mason 1935; Butterfield & Nicholas 1996; Cuen et al . 2013). These would seem to record a species ( C. eros ) or group of related species that can be distinguished from C. lilioides and Dyeran forms such as C. impar by having curved marginal rays; uncurved marginal rays are apparently documented from the Marjuman in the type specimens of C. drusilla (Walcott 1920) and C. aurora (Lochman 1940), but both seem to have nearly radially symmetrical sclerites based on published illustrations.…”

Section: Discussionmentioning

confidence: 99%

“…2010) and other probable examples, with unclear ray numbers, from Sonora (Cuen et al . 2013) and Pennsylvania (Walcott 1920; as Chancelloria yorkensis ).…”

Section: Discussionmentioning

confidence: 99%

“…2019a), C. bella (Demidenko 2000), C. cruceana (Beresi & Rigby 2013), C. pentacta (Rigby 1978), material attributed to C. eros by Cuen et al . (2013), and material left as C . sp.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

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Chancelloriid sclerites from the Dyeran–Delamaran (‘Lower–Middle’ Cambrian) boundary interval of the Pioche–Caliente region, Nevada,USA

Moore

Porter

Webster

et al. 2019

Papers in Palaeontology

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Chancelloriids are a poorly understood group of phylogenetically problematic Cambrian metazoans; complete specimens show they were sessile, radially symmetrical, 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 to lower Delamaran stages (latest Stage 4 to perhaps basal Wuliuan) from the Pioche–Caliente region of east‐central Nevada, USA. Acid maceration of samples from the Combined Metals, Comet Shale and Susan Duster Limestone members of the Pioche Formation yielded more than 2000 sclerites. Based on careful examination of these sclerites and statistical analyses of co‐occurring sclerite types, we distinguish six species, 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 abundant 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 species of both Archiasterella and Chancelloria. These results provide further support for the taxonomic tractability and biostratigraphical utility of chancelloriid sclerites; large collections from single horizons allow intraspecific variability to be assessed and species to be distinguished. Our results document a taxonomic turnover in chancelloriids at the Dyeran–Delamaran boundary, showing that not only trilobites were affected at this time.

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Chancelloriid sclerites from the lowermost Cambrian of North China and discussion of sclerite taxonomy

Yun

Zhang

et al. 2019

Geobios

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Chancelloriida Walcott, 1920 y Reticulosa Reid, 1958 del Cámbrico medio de San José de Gracia, Sonora, México

Cited by 11 publications

References 6 publications

Cambrian Stratigraphy of San José de Gracia, Sonora, Mexico: El Gavilán Formation, a new lithostratigraphic unit of middle Cambrian open shelf environment

Cambrian Stratigraphy of San José de Gracia, Sonora, Mexico: El Gavilán Formation, a new lithostratigraphic unit of middle Cambrian open shelf environment

Chancelloriid sclerites from the Dyeran–Delamaran (‘Lower–Middle’ Cambrian) boundary interval of the Pioche–Caliente region, Nevada,USA

Chancelloriid sclerites from the lowermost Cambrian of North China and discussion of sclerite taxonomy

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