On the connection of the Early Cambrian basins of Western Mongolia and Southern France on malacological data

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The study of previously collected fossils and new materials on Cambrian mollusks from the Bayangol Formation of Western Mongolia (Zavkhan structural-facies zone) revealed a significant similarity in the taxonomic composition of the mollusk assemblages of Western Mongolia and Southern France (Heraultia Limestone, Marcou Formation, Montagne Noire). In addition to the previously reported four common species (Latouchella korobkovi (Vostokova, 1962), Protoconus orolgainicus (Zhegallo, 1996), Purella tenuis Zhegallo, 1996, and Watsonella crosbyi Grabau, 1900), we have identified 10 more common species for these regions: Auricullina auriculata (Vassiljeva, 1990), Bemella jacutica (Missarzhevsky, 1966), “Calbyella” multicostata Missarzhevsky, 1995, Cambroscutum concameratum Kerber, 1988, Helcionella sp., Merismoconcha tommotica (Zhegallo, 1996), Obtusoconus amplus (Zhegallo, 1982), Prosinuites tripartitus Kerber, 1988, Purella layracensis (Kerber, 1988), and Securiconus sp. We have to reconsider the existing reconstruction of faunal relations of paleobasins on the western frame of Gondwana in terms of substantiating a close faunal exchange with the Zavkhan terrane, which during the Early Cambrian was a part of microcontinents chain located at low latitudes between the Siberian Platform in the west and Gondwana in the east.

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P. Parkhaev

Borisyak Paleontological Institute, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: pparkh@paleo.ru
俄罗斯联邦, Moscow

E. Zhegallo

Borisyak Paleontological Institute, Russian Academy of Sciences

Email: pparkh@paleo.ru
俄罗斯联邦, Moscow

D. Dorjnamjaa

Paleontological Institute, Mongolian Academy of Sciences

Email: pparkh@paleo.ru
蒙古, Ulan-Bator

参考

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2. Fig. 1. Paleogeographic reconstruction for the Early Cambrian time [2]; designations of the main continents and large terranes: A – Avalonia, AC – Arctic Alaska and Chukotka, Ab – Australia, Am– Armorian terranes, An – Annamia, Ar – Arabia, Af – Africa, B – Baltic platform, VA – East Antarctica , G – Greenland, I – Hindustan, Ib – Iberian massif, K – Kara microcontinent, KO– Kolymo-Omolonsky microcontinent, L – Lawrence, M – Madagascar, MT – Mongolian Terranes, NG – New Guinea, NZ – New Zealand, Pa – Patagonia, C – Siberian platform, SC – North China Platform, T– Ta- Roman block, Ts – Tasmania, SA – South America, South – South- Chinese platform.

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3. Fig. 2. Early Cambrian mollusks from the middle part of the Bayangol formation of Western Mongolia, which were also found in limestone from Heraultia (Black Mountains, department of Herault, Occitanie region, France); scale ruler – 1 mm; designations: A. A. – Auricullina auriculata (Vassiljeva, 1990) (ex. PIN, No. 3302/1872); B. j. – Bemella jacutica (Missarzhevsky, 1966) (ex. PIN, No. 3302/1876); C. C. – Cambroscutum concameratum Kerber, 1988 (ex. PIN, No. 3302/1845); C. M. – “Calbyella” multicostata Missarzhevsky, 1995 (ex. PIN, No. 3302/1537); H. S. – Helcionella sp. (ex. PIN, No. 3302/1723); L. k. – Latouchella korobkovi (Vostokova, 1962) (ex. PIN, No. 3302/1755); M. t. – Merismoconcha tommotica (Zhegallo, 1996) (ex. PIN, No. 3302/2333); O. A. – Obtusoconus amplus (Zhegallo, 1982) (holotype PIN, No. 3302/1508); P. tr. – Prosinuites tripartitus Kerber, 1988 (ex. PIN, No. 3302/2081); P. o. – Protoconus orolgainicus (Zhegallo, 1996) (ex. PIN, No. 3302/1878); P. l. – Purella layracensis (Kerber, 1988) (

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