The occurrence of Dickinsonia in non-marine facies

• Bobkov, N. I. ^[1] ; Kolesnikov, A. V. ^[2] ; Maslov, A. V. ^[3] ; Grazhdankin, D. V. ^[1]
  1. [1] Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences - Novosibirsk State University, Rusia
  2. [2] Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences - Geological Institute, Russian Academy of Sciences - Moscow State Pedagogical University, Rusia
  3. [3] Geological Institute, Russian Academy of Sciences - Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Rusia

  Mostrar afiliaciones +
• Localización: Estudios geológicos, ISSN 0367-0449, Vol. 75, Nº 2 (julio-diciembre), 2019
• Idioma: inglés
• Títulos paralelos:
  • La aparición de Dickinsonia en facies no marinas
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• Resumen
  • español

    En los Urales centrales, Dickinsonia se encuentra en medios de transición entre sustratos continentales y marinos marginales, generalmente de tipo laguna costera rodeada por llanuras mareales. Otro aspecto llamatico es la ausencia de otros taxones ediacáricos asociados con Dickinsonia, relativamente abundantes en otros medios. De hecho, el Miembro de Sinii Kamen de la Formación de Cherny Kamen ha librado una asociación de macrofósiles ediacáricos, que incluye anclajes de tipo aspidellamorfo y mawsonitomorfo, frondomorfos, palaeopascichnidos y estructuras en anillos concéntricos de origen microbiano, con los que no se asocia Dickinsonia.

  • English

    Dickinsonia in the central Urals occurs in a succession transitional from marginal marine to non-marine. Even within this sequence Dickinsonia appears to be restricted to the least marine facies interpreted as a coastal lagoon surrounded by tidal flats. Another puzzling aspect is the complete absence of other Ediacaran taxa that are usually found together with Dickinsonia in other fossil localities. In fact, the Sinii Kamen Member of the Cherny Kamen Formation yielded an assemblage of Ediacaran macrofossils including aspidellamorph and mawsonitomorph holdfasts, frondomorphs, palaeopascichnids, and concentric ring structures of microbial origin; however, fossils of Dickinsonia have never been found in this association.