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

• Autorzy: Ezeh S. C. , Mode W. A. , Ozumba B. M.

Identyfikatory

DOI

10.2478/logos-2018-0011

• Języki publikacji: 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.

Słowa kluczowe

PL

ichnologia; zasolenie; neogen

EN

Ichnoassociations; ichnology; salinity; Greater Ughelli; Central Swamp; Coastal Swamp; Neogene

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2018
• Tom: Vol. 24, No. 2
• Strony: 111--125
• Opis fizyczny: Bibliogr. 49 poz.

Twórcy

autor

Ezeh S. C.

• Department of Geology, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria

autor

Mode W. A.

• Department of Geology, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria

autor

Ozumba B. M.

• 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).