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{{Infobox rockunit |
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The '''Ameki Formation''' is a [[paleontology|palaeontological]] formation located in [[Nigeria]] |
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| name = Ameki Formation |
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Ameki formation is also a group that consists of two formations namely Nnanka formation, Nsugbe formation. It dates to the [[Middle Eocene]]. |
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| period = Bartonian |
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| age = [[Lutetian]]-[[Bartonian]] |
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| image = |
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| imagesize = |
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| caption = |
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| type = [[Geological formation]] |
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| prilithology = [[Shale]] |
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| otherlithology = [[Sandstone]], [[siltstone]] |
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| unitof = [[Bende-Ameki Group]] |
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| subunits = |
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| underlies = |
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| overlies = |
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| thickness = |
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| area = |
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| map = {{Location map+ | Nigeria |
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| relief = 1 |
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| width = 250 |
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| float = center |
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| places = |
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{{Location map~ | Nigeria |
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| lat_deg = 6.0 |
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| lon_deg = 7.0 |
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| mark = Orange pog.svg |
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| marksize = 12 |
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}} |
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}} |
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| map_caption = |
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| location = |
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| coordinates = {{Coord|6.0|N|7.0|E|display=inline,title}} |
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| paleocoordinates = {{Coord|1.6|N|1.5|E|display=inline}} |
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| region = |
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| country = {{NGA}} |
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| extent = [[Niger Delta Basin]] |
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| namedfor = [[Ameki]] |
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| namedby = |
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| year_ts = |
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| location_ts = |
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| coordinates_ts = |
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| region_ts = |
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| country_ts = |
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| thickness_ts = |
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}} |
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The '''Ameki Formation''' is a [[Lutetian]] to [[Bartonian]] [[geological formation]] located in [[Nigeria]]. It belongs to the [[Bende-Ameki Group]], which also consists of two formations namely [[Nanka Formation]], [[Nsugbe Formation]].<ref>{{Cite journal |last1=Ogbe |first1=Ovie B. |last2=Osokpor |first2=Jerry |date=2021-01-01 |title=Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria |journal=Heliyon |language=en |volume=7 |issue=1 |pages=e05846 |doi=10.1016/j.heliyon.2020.e05846 |doi-access=free |pmid=33521344 |issn=2405-8440|pmc=7820494 }}</ref><ref name=":1">{{Cite journal |last1=Odumodu |first1=Chukwuemeka |last2=Nfor |first2=Bruno |date=January 2012 |title=A New Paratype of an Eocene Nautiloid From the Ameki Formation, Southeastern Nigeria: Implications for Age and Paleoenvironmental Interpretation |url=https://www.academia.edu/8906860 |journal=Stratigraphy and Sedimentology of Oil-Gas Basins}}</ref> |
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== Fossil content == |
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Among others, the following fossils have been reported in the formation:<ref>[http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=32905 Ameki] at [[Fossilworks]].org</ref><ref>[http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=32906 Port Harcourt] at [[Fossilworks]].org</ref> |
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===Mammals=== |
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{| class="wikitable" align="center" |
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|- |
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! colspan="6" align="center" | [[Mammal]]s reported from the Ameki Formation |
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|- |
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! Genus !! Species !! Presence |
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!Material!! Notes !! Images |
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|- |
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|''[[Pappocetus]]'' |
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|''P. lugardi'' |
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|Ombialla District.<ref name=":0">{{Cite journal |last=Andrews |first=C. W. |date=December 1919 |title=A Description of New Species of Zeuglodont and of Leathery Turtle from the Eocene of Southern Nigeria |url=https://onlinelibrary.wiley.com/doi/10.1111/j.1096-3642.1919.tb02124.x |journal=Proceedings of the Zoological Society of London |language=en |volume=89 |issue=3–4 |pages=309–319 |doi=10.1111/j.1096-3642.1919.tb02124.x |issn=0370-2774}}</ref> |
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|Mandibles.<ref name=":0" /><ref>{{Cite journal |last1=McLeod |first1=Samuel A. |last2=Barnes |first2=Lawrence G. |date=January 1996 |title=The Systematic Position of Pappocetus Lugardi and a New Taxon From North America (Archaeoceti: Protocetidae) |journal=The Paleontological Society Special Publications |language=en |volume=8 |pages=270 |doi=10.1017/S2475262200002720 |issn=2475-2622|doi-access=free }}</ref> |
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|A [[Protocetidae|protocetid]]. |
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|} |
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===Reptiles=== |
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====Birds==== |
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{| class="wikitable" align="center" |
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|- |
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! colspan="6" align="center" | [[Bird]]s reported from the Ameki Formation |
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|- |
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! Genus !! Species !! Presence |
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!Material!! Notes !! Images |
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|- |
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|''[[Gigantornis]]'' |
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|''G. eaglesomei'' |
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|A [[Pelagornithidae|pelagornithid]]. |
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====Squamates==== |
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{| class="wikitable" align="center" |
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|- |
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! colspan="6" align="center" | [[Squamates]] reported from the Ameki Formation |
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|- |
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! Genus !! Species !! Presence |
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!Material!! Notes !! Images |
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|''[[Pterosphenus]]'' |
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|Trunk vertebra.<ref>{{Cite journal |last=Georgalis |first=Georgios L. |date=2023-06-19 |title=First potential occurrence of the large aquatic snake Pterosphenus (Serpentes, Palaeophiidae) from Nigeria, with further documentation of Pterosphenus schweinfurthi from Egypt |url=https://www.tandfonline.com/doi/full/10.1080/03115518.2023.2217874 |journal=Alcheringa: An Australasian Journal of Palaeontology |volume=47 |issue=3 |language=en |pages=327–335 |doi=10.1080/03115518.2023.2217874 |s2cid=259422068 |issn=0311-5518}}</ref> |
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|A [[Palaeophiidae|palaeophiid]]. |
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====Turtles==== |
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{| class="wikitable" align="center" |
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|- |
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! colspan="6" align="center" | [[Turtle]]s reported from the Ameki Formation |
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|- |
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! Genus !! Species !! Presence |
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!Material!! Notes !! Images |
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|- |
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| ''[[Cosmochelys]]'' |
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|''C. dolloi'' |
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| Ombialla District.<ref name=":0" /> |
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|Portions of [[carapace]].<ref name=":0" /> |
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| A [[Dermochelyidae|dermochelyid]]. |
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===Invertebrates=== |
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====Cephalopods==== |
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{| class="wikitable" align="center" |
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|- |
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! colspan="6" align="center" | [[Cephalopod]]s reported from the Ameki Formation |
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|- |
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! Genus !! Species !! Presence |
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!Material!! Notes !! Images |
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| ''[[Deltoidonautilus]]'' |
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|''D. nwajidei'' |
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|Multiple specimens.<ref name=":1" /> |
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| A [[nautiloid]]. |
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== See also == |
== See also == |
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* [[List of fossil sites]] |
* [[List of fossil sites]] |
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==References== |
== References == |
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{{reflist}} |
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* {{aut|Vickers-Rich, Patricia & Rich, Thomas Hewett}} (1993); ''Wildlife of Gondwana''. Reed. ISBN 0-7301-0315-3 |
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== Further reading == |
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[[Category:Eocene Africa]] |
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* {{aut|Vickers-Rich, Patricia & Rich, Thomas Hewett}} (1993); ''Wildlife of Gondwana''. Reed. {{ISBN|0-7301-0315-3}} |
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[[Category:Geology of Nigeria]] |
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[[Category:Eocene Series of Africa]] |
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[[Category:Geologic formations of Africa]] |
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[[Category:Eocene geology]] |
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[[Category:Geologic formations of Nigeria]] |
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[[Category:Eocene Series of Africa]] |
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{{Paleogene-stub}} |
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[[Category:Shale formations]] |
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{{geologic-formation-stub}} |
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{{paleo-site-stub}} |
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{{nigeria-stub}} |
Ameki Formation | |
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Stratigraphic range: Lutetian-Bartonian | |
Type | Geological formation |
Unit of | Bende-Ameki Group |
Lithology | |
Primary | Shale |
Other | Sandstone, siltstone |
Location | |
Coordinates | 6°00′N 7°00′E / 6.0°N 7.0°E / 6.0; 7.0 |
Approximate paleocoordinates | 1°36′N 1°30′E / 1.6°N 1.5°E / 1.6; 1.5 |
Country | ![]() |
Extent | Niger Delta Basin |
Type section | |
Named for | Ameki |
Ameki Formation (Nigeria) |
The Ameki Formation is a LutetiantoBartonian geological formation located in Nigeria. It belongs to the Bende-Ameki Group, which also consists of two formations namely Nanka Formation, Nsugbe Formation.[1][2]
Among others, the following fossils have been reported in the formation:[3][4]
Mammals reported from the Ameki Formation | |||||
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Genus | Species | Presence | Material | Notes | Images |
Pappocetus | P. lugardi | Ombialla District.[5] | Mandibles.[5][6] | Aprotocetid. |
Birds reported from the Ameki Formation | |||||
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Genus | Species | Presence | Material | Notes | Images |
Gigantornis | G. eaglesomei | Apelagornithid. |
Squamates reported from the Ameki Formation | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Pterosphenus | Trunk vertebra.[7] | Apalaeophiid. |
Turtles reported from the Ameki Formation | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Cosmochelys | C. dolloi | Ombialla District.[5] | Portions of carapace.[5] | Adermochelyid. |
Cephalopods reported from the Ameki Formation | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Deltoidonautilus | D. nwajidei | Multiple specimens.[2] | Anautiloid. |