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

Cuen-Romero, Francisco Javier; Valdez-Holguín, José Eduardo; Buitrón, Blanca Estela; Monreal, Rogelio; Sundberg, Frederick A.; Montijo-González, Alejandra; Minjarez-Sosa, Ismael

doi:10.18268/bsgm2016v68n3a4

Cited by 14 publications

(11 citation statements)

References 5 publications

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“…This faunal content is practically identical to the assemblage cited from the type section of San José de Gracia, Sonora, located 10 km to the south of the study area (Fig. 1) (Cuen et al 2013;Cuen-Romero et al, 2016).…”

Section: Biostratigraphical Considerationssupporting

confidence: 73%

“…These areas have been studied by several authors (Lochman, 1948;Cooper et al, 1952;Cooper et al, 1956;Stewart, McMenamin, & Morales-Ramirez, 1984;González-León, 1986;McMenamin, 1987;Almazán-Vázquez, 1989;Vega-Granillo, 1996;Cuen-Romero et al, 2016;Cuen-Romero et al, 2018;Cuen-Romero et al, 2019;Beresi, Buitrón-Sánchez, Cuen-Romero, & Palafox, 2019). The recent discovery of Cambrian outcrops in central Sonora has been the subject of several stratigraphic and paleontological studies (Nardin, Almazán-Vázquez, & Buitrón-Sánchez, 2009;Cuen et al, 2013;Buitrón-Sánchez, Corona-González, Cuen-Romero, Palafox-Reyes, & Ramírez-Guerrero, 2016;Buitrón-Sánchez, Cuen-Romero, Huerta-Ruiz, & Montijo-González, 2017a;Buitrón-Sánchez, Cuen-Romero, Montijo-González, & Beresi, 2017b;Cuen-Romero et al, 2016;Cuen-Romero et al, 2019). This research work was carried out in a new Cambrian locality in the central part of the state of Sonora, El Sahuaral Hill, which has been scarcely studied but has an abundant fossil biota.…”

mentioning

confidence: 99%

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First record of Ubaghsicystis (Eocrinoidea - Echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations

Buitrón-Sánchez

Cuen-Romero

Beresi

et al. 2021

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Introduction: The present work constitutes the first record of Ubaghsicystis Gil-Cid & Domínguez-Alonso (Echinodermata-Eocrinoidea) in the El Gavilán Formation, exposed in the El Sahuaral Hill, a new Cambrian locality of central Sonora, Mexico. The El Gavilán Formation is a sedimentary sequence mainly made up of shale interbedded with limestone, with abundant invertebrate fossils, deposited in an open shelf marine environment. Objective: The main objective of this research work is to describe the species Ubaghsicystis cf. U. segurae for the first time in Mexico, in addition to biostratigraphic and paleoecological considerations. Methods: A composite stratigraphic section of the El Gavilán Fm. was measured in central Sonora, where samples corresponding to eocrinods were collected, the material was examined in the Microscope Leica MZ10. Results: The biotic association is composed of reticulosan sponges, chancelloriids (Chancelloria eros, Allonnia tintinopsis, Archiasterella sp.), hyolithids, brachiopods, trilobites (Quadragnostus depressa, Peronopsis sp., Tonkinella valida, and Elrathina sp.), and echinoderms (Ubaghsicystis cf. U. segurae). Regarding the age, the trilobite association establishes a chronostratigraphic position from the middle Cambrian (Miaolingian, Wuliuan), Altiocculus Subzone, Ehmaniella Zone. The material studied is constituted by isolated echinoderm plates, which probably represent various cycles of theca plates assigned to Ubaghsicystis cf. U. segurae. The genus Ubaghsicystis has been scarcely recorded in a few Cambrian regions (e.g., Burgess Shale in Canada and Los Barrios de Luna in Spain), so that the information about this taxon is limited. Conclusions: The Cambrian succession of Sonora, where Ubaghsicystis occurred, was part of the border from the Laurentia craton during this period, located near the Paleoequator during this period, where ideal conditions for increasing diversity and abundance of species were developed, including echinoderms.

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Section: Biostratigraphical Considerationssupporting

confidence: 73%

mentioning

confidence: 99%

First record of Ubaghsicystis (Eocrinoidea - Echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations

Buitrón-Sánchez

Cuen-Romero

Beresi

et al. 2021

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“…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 . 1952); 22, Cadiz Formation, Marble Mountains, California (Mason 1935); 23, Bright Angel Shale, Grand Canyon, Arizona (Elliott & Martin 1987); 24, Burgess Shale Formation, British Columbia (Walcott 1920; Johnston et al .…”

Section: Discussionmentioning

confidence: 99%

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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“…En la base, se han observado secciones transversales de arqueociátidos en posición de vida inmersos en caliza gris claro, lo que permite inferir el registro de rocas equivalentes a la Formación Puerto Blanco definida en Caborca por Cooper et al, (1952) intercalaciones mayoritarias de calcilutita de tonalidades rojizas con caliza delgada aflorante en la sección estratigráfica de El Sahuaral. Esta formación fue definida en el área del cerro El Chihuarruita, San José de Gracia, su sección tipo, con un espesor de 233 m y por la asociación de trilobites fue asignada a la parte superior de la Zona de Mexicella mexicana, Subzona de Albertella highlandensis, Zona de Ptychagnostus praecurrens (Cuen-Romero et al, 2016). La sección tipo de la Formación El Gavilán en San José de Gracias, se encuentra localizada a 7 km de la sección El Sahuaral, en Sonora central (Figura 2).…”

Section: Marco Estratigráficounclassified

“…y Lingulella sp. (Cuen-Romero et al, 2016) y los hiolítidos Hyolithes sonora Lochman en Cooper et al, 1952y Haphophrentis reesei Babcock y Robinson, 1988(Buitrón et al, 2011.…”

Section: Fauna Acompañanteunclassified

Escleritomos de Chancelloria eros y escleritos del Cámbrico medio (Serie 3, Piso 5) de Sonora central, México

Beresi¹,

Sánchez²,

Cuen-Romero³

et al. 2019

revmexcg

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

Cited by 14 publications

References 5 publications

First record of Ubaghsicystis (Eocrinoidea - Echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations

First record of Ubaghsicystis (Eocrinoidea - Echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations

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

Escleritomos de Chancelloria eros y escleritos del Cámbrico medio (Serie 3, Piso 5) de Sonora central, México

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