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Characteristic trace fossils from Miocene brackish-water deposits in the Niger Delta, Nigeria

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PL
Abstrakty
EN
Miocene deposits in the eastern portion of the Greater Ughelli, Central Swamp and Coastal Swamp depobelts contain well-developed brackish-water trace fossil assemblages. Twelve ichnogenera have been identified, namely: Asterosoma, Bergaueria, Chondrites, Gyrolithes, Thalassinoides, Lockeia, Palaeophycus, ?Conichnus, Planolites, Siphonichnus, Skolithos and Diplocraterion. In addition, common non-descript, passively filled burrows and fugichnia (escape structures) have also been observed. The above-mentioned ichnogenera and associated non-descript structures can be arranged into six distinct and recurring ichnoassociations within the Greater Ughelli, Central Swamp and Coastal Swamp depobelts. Each ichnoassociation is comprised of a group of trace fossils which collectively reflect specific environmental conditions during deposition of these Miocene strata. All trace fossil assemblages illustrate deposition in nearshore, restricted settings. Ichnological and sedimentological criteria which may be utilized to recognise brackish-water deposits are discussed and illustrated in pictures of the cores studied.
Czasopismo
Rocznik
Strony
111--125
Opis fizyczny
Bibliogr. 49 poz.
Twórcy
autor
  • Department of Geology, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria
autor
  • Department of Geology, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria
autor
  • Independent Petroleum Geological Consultant
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Uwagi
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-ab33163d-62e2-478b-8d3f-e0e2c63d6780
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