Cambrian (Stage 4 to Wuliuan) brachiopods from Sonora, Mexico

Abstract. The Cambrian successions at the Chihuarruita Hill outcrop, Sonora, Mexico, have yielded two successive linguliform brachiopod assemblages that are transitional between Cambrian Stage 4 and the newly recognized global Wuliuan Stage. The lowermost assemblage includes Dictyonina sp., Paterina sp., Eothele sp., Hadrotreta rara? (Cooper), and Linnarssonia arellanoi? (Cooper), coming from the upper part of the Buelna Formation. The younger, recently named El Gavilán Formation contains a more diverse linguliform brachiopod assemblage, including Acrothele concava Cooper, Batenevotreta? mexicana n. sp., Dictyonina minutipuncta Cooper, Eothele sp., Eoobolus sp., Hadrotreta rara? (Cooper), Linnarssonia arellanoi? (Cooper), Micromitra sp., Paterina sp., and Prototreta sp. The El Gavilán Formation contains a diverse trilobite fauna suggesting Delamaran age in terms of the Laurentian regional stratigraphical scheme. The base of the global Wuliuan Stage and Miaolingian Series is defined by the first occurrence of Oryctocephalus indicus; in the absence of the index species, the base should be provisionally placed at the base of the El Gavilán Formation. The Wuliuan age of the brachiopod assemblage recovered from the El Gavilán Formation is supported by the occurrence of Acrothele in the Cambrian biostratigraphical succession of Himalaya, where the genus makes its first appearance in the Kaotaia prachina Zone. In addition, the co-occurrences of Acrothele and Eothele can be taken as an indication of the Wuliuan age of the fauna. A new biogeographic analysis confirms that the Eothele Fauna first appeared at the end of Cambrian Stage 4, as a result of increased faunal migration within the southern tropical latitudes directed from Australasian Gondwana to Laurentia.

[1]  L. Holmer,et al.  Brachiopods from the Latham Shale Lagerstätte (Cambrian Series 2, Stage 4) and Cadiz Formation (Miaolingian, Wuliuan), California , 2021, Journal of Paleontology.

[2]  F. Sundberg,et al.  Cambrian (Series 2 to Miaolingian) platform facies from central Sonora, Mexico and the regional correlation , 2021 .

[3]  L. F. Enríquez-Ocaña,et al.  Cambrian stratigraphy (Series 2 to Miaolingian) of the El Sahuaral area in central Sonora, Mexico: Biostratigraphic implications , 2020 .

[4]  F. J. Cuen-Romero,et al.  El Paleozoico inferior de Sonora, México: 120 años de investigación paleontológica , 2020 .

[5]  L. Holmer,et al.  Linguliform brachiopods from the Cambrian (Guzhangian) Karpinsk Formation of Novaya Zemlya , 2020, Papers in Palaeontology.

[6]  D. Vachard,et al.  Early Cambrian Small Shelly Fossils from northwest Mexico: Biostratigraphic implications for Laurentia , 2019, Palaeontologia Electronica.

[7]  José Eduardo Valdez Holguín,et al.  Paleoecology of cambrian communities of central Sonora, Mexico: Paleoenvironmental and biostratigraphic considerations , 2019, Journal of South American Earth Sciences.

[8]  L. Holmer,et al.  Earliest ontogeny of early Cambrian acrotretoid brachiopods — first evidence for metamorphosis and its implications , 2018, BMC Evolutionary Biology.

[9]  B. Buitrón-Sánchez,et al.  Trilobite-based biostratigraphy (arthropoda-trilobita) and related faunas of the Cambrian from Sonora, Mexico , 2018 .

[10]  T. Torsvik,et al.  Earth History and Palaeogeography , 2017 .

[11]  G. Geyer,et al.  Ovatoryctocara granulata assemblage (Cambrian Series 2–Series 3 boundary) of Løndal, North Greenland , 2016 .

[12]  L. Holmer,et al.  Himalayan Cambrian brachiopods , 2015 .

[13]  P. Kruse,et al.  Middle Cambrian brachiopods from the southern Georgina Basin of central Australia , 2014 .

[14]  W. Carpenter,et al.  ON THE CLASSIFICATION OF THE BRACHIOPODA , 2011 .

[15]  G. Ushatinskaya,et al.  New brachiopod species from the order acrotretida from the Cambrian of central Kazakhstan , 2010 .

[16]  B. Buitrón-Sánchez,et al.  First report of Gogia (Eocrinoidea, Echinodermata) from the Early-Middle Cambrian of Sonora (Mexico), with biostratigraphical and palaeoecological comments , 2009 .

[17]  J. J. Álvaro,et al.  Short-term episodes of carbonate productivity in a Cambrian uplifted rift shoulder of the Coastal Meseta, Morocco , 2008 .

[18]  M. Mergl,et al.  New Middle Cambrian lingulate brachiopods from the Skryje-Týřovice area (Central Bohemia, Czech Republic) , 2008 .

[19]  J. A.,et al.  INARTICULATE BRACHIOPODS OF THE LOWER AND MIDDLE CAMBRIAN PIOCHE SHALE OF THE PIOCHE DISTRICT , NEVADA ' , 2008 .

[20]  L. Holmer,et al.  Columnar shell structures in early linguloid brachiopods – new data from the Middle Cambrian of Sweden , 2007, Earth and Environmental Science Transactions of the Royal Society of Edinburgh.

[21]  Thomas Wotte,et al.  Brachiopods from the Lower-middle Cambrian Lancara Formation of the Cantabrian Mountains, Northwest Spain , 2007 .

[22]  L. Holmer,et al.  The Lower Cambrian brachiopod Kyrshabaktella and associated shelly fossils from the Harkless Formation, southern Nevada , 2006 .

[23]  G. Brock,et al.  Cambrian stratigraphy and faunas at Mount Arrowsmith, northwestern New South Wales , 2006 .

[24]  L. Holmer,et al.  EARLY CAMBRIAN BRACHIOPODS FROM NORTH‐EAST GREENLAND , 2005 .

[25]  L. Holmer,et al.  Early Cambrian lingulate brachiopods from the Shaanxi Province, China , 2004 .

[26]  T. Torsvik,et al.  Earth geography from 500 to 400 million years ago: a faunal and palaeomagnetic review , 2002, Journal of the Geological Society.

[27]  J. H. Stewart,et al.  Neoproterozoic and Cambrian strata of Sonora, Mexico: Rodinian supercontinent to Laurentian Cordilleran margin , 2002 .

[28]  O Hammer-Muntz,et al.  PAST: paleontological statistics software package for education and data analysis version 2.09 , 2001 .

[29]  P. Kruse.  Cambrian palaeontology of the eastern Wiso and western Georgina Basins , 1998 .

[30]  Alwyn Williams,et al.  A Supra-Ordinal Classification of the Brachiopoda , 1996 .

[31]  L. Holmer,et al.  Middle Cambrian lingulate brachiopods from Tarbagatay Range, Kazakhstan , 1996 .

[32]  L. Holmer,et al.  Early Cambrian lingulate brachiopods from glacial erratics of King George Island, (South Shetland Islands), Antarctica , 1996 .

[33]  P. Kruse.  Cambrian fauna of the Top Springs Limestone, Georgina Basin , 1991, The Beagle : Records of the Museums and Art Galleries of the Northern Territory.

[34]  P. Kruse.  Cambrian palaeontology of the Daly Basin , 1990 .

[35]  P. Jell,et al.  Early Middle Cambrian (Ordian) brachiopods of the Coonigan Formation, western New South Wales , 1990 .

[36]  M. McMenamin.  Paleontology and stratigraphy of Lower Cambrian and upper Proterozoic sediments, Caborca region, northwestern Sonora, Mexico , 1984 .

[37]  J. H. Stewart,et al.  Upper Proterozoic and Cambrian rocks in the Caborca region, Sonora, Mexico; physical stratigraphy, biostratigraphy, paleocurrent studies, and regional relations , 1984 .

[38]  Eladio Liñán Guijarro,et al.  Lower Cambrian Brachiopods of Sierra Morena, SW Spain , 1982 .

[39]  A. J. Rowell.  Inarticulate Brachiopods of the Lower and Middle Cambrian Pioche Shale of the Pioche District, Nevada , 1980 .

[40]  A. J. Rowell.  Revision of some Cambrian and Ordovician inarticulate brachiopods , 1966 .

[41]  G. A. Cooper.  Cambrian stratigraphy and paleontology near Caborca, northwestern Sonora, Mexico , 1952 .

[42]  M. I. Whitney,et al.  Papers of the Michigan Academy of Science, Arts and Letters , 1946, Nature.

[43]  W. C. Bell.  Cambrian Brachiopoda from Montana , 1941 .

[44]  C. Walcott.  Cambrian Brachiopoda Acrotreta; Linnarssonella; Obolus; with descriptions of new species , 1902 .

[45]  C. Walcott.  Paleontologic notes [Saint John fauna, N. B.] , 1885, American Journal of Science.

[46]  C. White.  Preliminary report upon invertebrate fossils collected by the expeditions of 1871, 1872, and 1873, , 2015 .

[47]  J. Dawson.  Acadian geology: the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island , 2011 .