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Contents

   



(Top)
  


1 Description  




2 Paleoenvironment  




3 Paleobiota  


3.1  Mammals  


3.1.1  Meriduingulata  




3.1.2  Cetacean  




3.1.3  Metatherians  




3.1.4  Other mammals  






3.2  Birds  


3.2.1  Sphenisciformes  




3.2.2  Other birds  






3.3  Amphibians  




3.4  Fish  


3.4.1  Chondrichthyes  


3.4.1.1  Carcharhinidae  




3.4.1.2  Hexanchidae  




3.4.1.3  Lamnidae  




3.4.1.4  Mitsukurinidae  




3.4.1.5  Odontaspididae  




3.4.1.6  Orectolobidae  




3.4.1.7  Pristiophoridae  




3.4.1.8  Squalidae  






3.4.2  Actinopterygii  


3.4.2.1  Xiphiidae  




3.4.2.2  Notothenioids  








3.5  Cephalopods  




3.6  Plants  






4 See also  




5 References  




6 Further reading  













La Meseta Formation






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Coordinates: 64°14′21.782″S 56°36′11.69″W / 64.23938389°S 56.6032472°W / -64.23938389; -56.6032472
  
From Wikipedia, the free encyclopedia
  

This article is about an Antarctica sedimentary sequence. For the geological feature, see Mesa. For other uses, see Meseta.
La Meseta Formation
Stratigraphic range: Eocene

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TypeGeological formation
Unit ofSeymour Island Group[1]
UnderliesWeddell Formation
OverliesLopez de Bertodano, Sobral & Cross Valley Formations
Thickness557 m (1,827 ft)[2]
Lithology
PrimarySandstone, claystone
OtherSiltstone, mudstone, conglomerate
Location
Coordinates64°14′21.782″S 56°36′11.69″W / 64.23938389°S 56.6032472°W / -64.23938389; -56.6032472.[3]
Approximate paleocoordinates63°42′S 61°30′W / 63.7°S 61.5°W / -63.7; -61.5
RegionSeymour Island
CountryAntarctica

Geologic map of Seymour Island, Antarctica with La Meseta Formation in dark yellow

The La Meseta Formation is a sedimentary sequence deposited during the EoceneonSeymour Island off the coast of the Antarctic Peninsula. It is noted for its fossils, which include both marine organisms and the only terrestrial vertebrate fossils from the Cenozoic of Antarctica.[2][4]

Description[edit]

La Meseta Formation lies unconformably on the Cretaceous Lopez de Bertodano Formation. It is an approximately 557 metres (1,827 ft) thick sequence of poorly consolidated sandstones and siltstones. The depositional environment was probably coastal, deltaic or estuarine in character. The top of the sequence is an erosional unconformity to Pleistocene glacial gravels.[3][2] La Meseta Formation is one of the sequences that make up the fill of the Late JurassictoPaleogene James Ross Basin.[3]

Paleoenvironment[edit]

The terrestrial environment surrounding the deposition area is thought to have been a temperate polar forest, including podocarp and araucarian conifers, as well as Nothofagus.[5][6] Most of the fossilized woods and flowers discovered on Seymour Islands consist of extinct species of conifer trees and lilies during warm climate.[7][8]

Paleobiota[edit]

La Meseta Formation is extremely rich in fossils. Among mammals, the meridiungulata Antarctodon and Trigonostylops have been found in the formation.[9][10] as well as marsupial Derorhynchidae, Microbiotheria, and polydolopimorphia.[11][12] It is famous for its penguin fossils, for example the two genera Archaeospheniscus and Palaeeudyptes.[13][14] Other bird fossils include Dasornis, a genus of pseudotooth birds. There is also an abundance of trace fossils. Diplocraterion, Helminthopsis, Muensteria, Oichnus, Ophiomorpha, Skolithos, Teredolites and Zapfella have been described.[15] Over 35 species and 26 families of fish, which includes sharks, have been described from the Ypresian Cucullaea bed.[3][16]

Mammals[edit]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Meriduingulata[edit]

Astrapotheria
Taxa Species Locality Stratigraphic position Material Notes Images
Antarctodon A. sobrali Locality DVP 2/84 and IAA 1/90. Cucullaea I allomember (Telm 5). MLP 08-XI-30-1, an isolated right p4 or m1. Anastrapothere
Trigonostylops T. indet. Cucullaea I allomember (Telm 5). Anastrapothere
Litopterna
Taxa Species Locality Stratigraphic position Material Notes Images
Notiolofos N. arquinotiensis Locality IAA 1/13 and DPV 16/84. Acantilados II, Campamento, Cucullaea I Allomember (Telm 4) and Submeseta Member (Telm 7). A Brachyodont lower right molar fragment, probably m1 or m2, preserves a portion of the talonid with most of the lingual side (MLP 13-I-25-1) and left M3 incomplete (MLP 95-I-10-6). Asparnotheriodontid litoptern.
N. regueroi Locality IAA 2/16 Lower coquina bed of Cucullaea I Allomember. IAA-PV 173, Isolated complete left m3.
Victorlemoinea V. sp. Cucullaea I allomember (Telm 5). Asparnotheriodontid litoptern.

Cetacean[edit]

Taxa Species Locality Stratigraphic position Material Notes Images
Basilosaurus undetermined
Llanocetus L. denticrenatus Locality DPV 10/84 and DVP 13/24. Unit III Member and Telm 7. A partial mandible with two teeth (specimen USNM 183022) and an endocast of the braincase. a toothed baleen whale.
Zygorhiza undetermined

Metatherians[edit]

Derorhynchidae
Taxa Species Locality Stratigraphic position Material Notes Images
Derorhynchus[17] D. minutus[17] Locality IAA 1/90. Allomember Cucullaea I (Telm 5). MLP 96-1-5-44, incomplete right horizontal ramus of the dentary fragment with m2-3.
Pauladelphys[17][18] P. juanjoi[17][18] Locality IAA 2/95 and IAA 1/90. Allomember Cucullaea I (Telm 5). An isolated lower molar (MLP 95-1-10-2) and an upper left molar (MLP 96-1-5-44).
Xenostylos X. peninsularis[17] Locality IAA 1/90. Allomember Cucullaea I (Telm 5). MLP 94-111-15-10, an isolated upper right molar.
Microbiotheria
Taxa Species Locality Stratigraphic position Material Notes Images
Marambiotherium[17] M. glacialis[17] Locality IAA 1/90 and RV-8200. Cucullaea I allomember (Telm 5). MLP 95-1-10-1, a fragment of a right mandibular ramus with a complete m4 and the posterior alveolus of m3 and MLP 88-1-1-1, an edentulous left mandibular ramus with the alveoli for p3-m4. Members of Microbiotheria
Woodburnodon W. casei Locality IAA 1/95. Cucullaea I allomember (Telm 5). MLP 04-III-1-2, an isolated, worn upper right molar (M2 or M3).
Polydolopimorphia
Taxa Species Locality Stratigraphic position Material Notes Images
Antarctodolops A. dailyi Locality IAA 2/95, DPV 2/84, and DPV 6/84. Cucullaea I allomember (Telm 5). UCR 20910, a left dentary with p3-m2. Apolydolopimorphian metatherian.
A. mesetaense Locality IAA 1/90 and DPV 6/84. Cucullaea I allomember (Telm 5). Right dentary fragments.
Perrodelphys P. coquinense[17] Locality IAA 1/90. Cucullaea I allomember (Telm 5). MLP 96-1-5-11, an isolated left lower molar. Apolydolopimorphian metatherian.
Polydolops P. dailyi Locality IAA 1/90 & DPV 3/84. Cucullaea I allomember (Telm 5). Apolydolopimorphian metatherian.
P. seymouriensis Locality IAA 1/90 & DPV 3/84. Cucullaea I allomember (Telm 5).
P. thomasi Locality IAA 1/90 & DPV 3/84. Cucullaea I allomember (Telm 5).
Pujatodon P. ektopos[19] Locality IAA 1/90. Cucullaea I Allomember (Telm 5). Specimen MLP 14-I-10-20, a lower left molar (m2 or m3) partially worn. Apolydolopimorphian metatherian.

Other mammals[edit]

Taxa Species Locality Stratigraphic position Material Notes Images
Sudamerica S. ameghinoi Locality IAA 1/90 upper level. Cucullaea I Allomember. MLP 95-I-10-5, anterior part of a left dentary with the rodent-like incisor partially preserved. Agondwanathere
Meridiolestida?[20] Indeterminate Locality IAA 1/90 upper level. Cucullaea I Allomember. A single tooth, now lost.[20]
Xenarthra? Indeterminate. Locality S124. Cucullaea I Allomember/ Telm 4. TMM 44190-1, left metacarpal II and A phalanx and a partial tooth[20]

Birds[edit]

Sphenisciformes[edit]

Taxa Species Locality Stratigraphic position Material Notes Images
Anthropornis A. grandis Locality IAA 4/12, IAA 1/90, DPV 13/84, and DVP 2/84. Telm 4 member, Telm 7 member, and Submeseta Allomember. Humerus: MLP 93-X-1-4 (proximal epiphysis), MLP 82-IV-23-4 (proximal epiphysis), MLP 83-I-1-190(proximal epiphysis) and MLP 88-I-1-463(proximal epiphysis). Relatives of giant penguins.
A. nordenskjoldi[18] Submeseta Allomember. Humerus: MLP CX-60-25 (proximal epiphysis), MLP 83-V-30-5 (diaphysis) and MLP 93-X-1-104(complete humerus).
Archaeospheniscus A. lopdelli Submeseta Allomember. Relatives of giant penguins
A. wimani Submeseta Allomember.
Delphinornis[18] D. arctowskii DPV 14/84 Cucullaea I Allomember (Telm 7).
D. graclis DPV 14/84 Cucullaea I Allomember (Telm 7).
D. larseni DPV 13/84 and DPV 14/84. Cucullaea I Allomember (Telm 5 and Telm 7) and Submeseta Allomember.
Marambiornis M. exilis DVP 2/84, IAA 1/12, and ZPAL 4 Telm 7 Member. A limb element (right tarsometatarsus). An early relative of penguin.
Mesetaornis M. polaris Telm 7 member. A nearly complete right femur and two distal left tibiotarsi.
Orthopteryx O. gigas[14]
Palaeeudyptes P. antarcticus Cucullaea I Allomember (Telm 3, Telm 4, Telm 5, and Telm 7) and Submeseta Allomember. The narrow-flippered penguin.
P. gunnari [18] DVP 2/84, DVP 10/84, DVP 13/84, DVP 14/84, DVP 15/84, and ZPAL 4. Cucullaea I Allomember (Telm 3, Telm 5, and Telm 7) and Submeseta Allomember. Multiple specimens consist of coracoids, ulna, and humerus.
P. klekowskii DVP 2/84, DVP 10/84, DVP 13/84, DVP 14/84, DVP 16/84, and ZPAL 4. Cucullaea I Allomember (Telm 3, Telm 5, and Telm 7) and Submeseta Allomember. Several specimens consist of humerus, coracoid, ulna, and tibiotarsus.
Wimanornis W. seymourensis DPV 14/84. Cucullaea I Allomember (Telm 7) and Submeseta Allomember.
Tonniornis T. mesetaensis DPV 14/84. Cucullaea I Allomember (Telm 7) and Submeseta Allomember.
T. minimum DPV 14/84. Cucullaea I Allomember (Telm 7) and Submeseta Allomember.

Other birds[edit]

Taxa Species Locality Stratigraphic position Material Notes Images
Antarctoboenus[21] A. carlinii IAA 2/95 locality Cucullaea I Allomember MLP 95-I-10-8, distal end of left tarsometatarsus A stem Falconiform
Dasornis D. sp. Apseudotooth bird
Phorusrhacidae? Indeterminate. Locality IAA 2/13 Cucullaea I Allomember A right ungual phalanx (MLP-PV 13-XI-28-546) and an incomplete ungual phalanx (MLP-PV 14-I-10-199)[22] A large flightless cariamiform bird[22]

Amphibians[edit]

Taxa Species Locality Stratigraphic position Material Notes Images
Calyptocephalella C. sp.[23] Locality IAA 2/95. Cucullaea I Allomember (Telm 5). The fragmentary right ilium (NRM-PZ B282) and a skull bone (NRM-PZ B281). Calyptocephalellid frog

Fish[edit]

Chondrichthyes[edit]

Carcharhinidae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Scoliodon S. sp. Multiple teeth. Arequiem shark.
Hexanchidae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Heptranchias H. howellii Upper lateral teeth. Relatives of sevengill sharks.
Hexanchus [18] H. sp.[18]
Lamnidae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Isurus I. praecursor
Lamna L. cf. nasus
Otodus O. auriculatus
Mitsukurinidae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Anomotodon A. multidenticulata An extinct relative of goblin shark.
Odontaspididae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Odontaspis O. rutoti Relatives of sand shark.
O. winkleri
Striatolamia S. macrota An early relative of sand shark.
Orectolobidae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Stegostoma S. cf. varium
Pseudoginglymostoma P. cf. P. brevicaudatum
Pristiophoridae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Pristiophorus P. lanceolatus
P. laevis[24]
Squalidae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Squalus S. weltoni UCR RV-8200, Telm 4. Lower A complete lateral tooth. An early dogfish relative.
S. woodburnei UCR RV-8200, Telm 4. Lower. A complete lateral tooth.

Actinopterygii[edit]

Xiphiidae[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Xiphiorhynchus[18] X. cf. sp.
Notothenioids[edit]
Taxa Species Locality Stratigraphic position Material Notes Images
Mesetaichthys M. jerzmanskae Fragmentary skull bones and vertebra. An early member of the Notothenioidei, the dominant marine fish of Antarctica today. Initially assigned to the Gadiformes.[25]

Cephalopods[edit]

Taxa Species Locality Stratigraphic position Material Notes Images
Antarcticeras A. nordenskjoeldi NRM 8, below IAA 1/90 (Ungulate Site). Cucullaea I shell bed, Telm 4. A fragmentary preserved straight shell. An enigmatic cephalopod that is either considered a descendant of the orthocerids or an oegopsid squid.
Euciphoceras E. sp. NRM 8, below IAA 1/90 (Ungulate Site). Cucullaea I shell bed, Telm 4. A fragmentary preserved straight shell. Anautiloid.

Plants[edit]

Taxa Species Locality Stratigraphic position Material Notes Images
Agathoxylon A. pseudoparenchymatosum Locality 5 Cucullaea I allomember Fossilized wood.
fossilized seed of Notonuphar
Cupressinoxylon C. hallei Localities 4, 5, 6 and 7. Campamento and Cucullaea I allomember. Fossilized wood.
Notonuphar N. antarctica IAA 2/95. Cucullaea I Allomember (Telm 5). Fossilized seeds. A water lily.
Nelumbo ?Nelumbo sp.[8]
Protophyllocladoxylon P. francisiae
Phyllocladoxylon P. antarcticum
P. pooleae

See also[edit]

References[edit]

  1. ^ Zinsmeister, Jeffrey D. Stilwell ; William J. (1992). Molluscan systematics and biostratigraphy : Lower Tertiary La Meseta Formation, Seymour Island, Antarctic Peninsula. Washington, DC: American Geophysical Union. ISBN 978-0875907703.{{cite book}}: CS1 maint: multiple names: authors list (link)
  • ^ a b c Pezzetti, T.F.; KRISSEK, L.A (1986). "Re-evaluation of the Eocene La Meseta Formation of Seymour Island, AntarcticPeninsula": 75. {{cite journal}}: Cite journal requires |journal= (help)
  • ^ a b c d Reguero, Marcelo A.; Sergio A. Marenssi; Sergio N. Santillana (2012). "Weddellian marine/coastal vertebrates diversity from a basal horizon (Ypresian, Eocene) of the Cucullaea I Allomember, La Meseta formation, Seymour (Marambio) Island, Antarctica". Rev. Peru. Biol. 19 (3): 275–284. doi:10.15381/rpb.v19i3.1006.
  • ^ Vega, Greta C.; Olalla-Tárraga, Miguel Ángel (2020), "Past changes on fauna and flora distribution", Past Antarctica, Elsevier, pp. 165–179, doi:10.1016/b978-0-12-817925-3.00009-4, ISBN 978-0-12-817925-3, retrieved 2023-09-20
  • ^ Pujana, Roberto R.; Santillana, Sergio N.; Marenssi, Sergio A. (January 2014). "Conifer fossil woods from the La Meseta Formation (Eocene of Western Antarctica): Evidence of Podocarpaceae-dominated forests". Review of Palaeobotany and Palynology. 200: 122–137. doi:10.1016/j.revpalbo.2013.09.001. hdl:11336/17151.
  • ^ Reguero, Marcelo A.; Marenssi, Sergio A.; Santillana, Sergio N. (May 2002). "Antarctic Peninsula and South America (Patagonia) Paleogene terrestrial faunas and environments: biogeographic relationships". Palaeogeography, Palaeoclimatology, Palaeoecology. 179 (3–4): 189–210. doi:10.1016/S0031-0182(01)00417-5.
  • ^ Pujana, R. R., Wilf, P., & Gandolfo, M. A. (2020). Conifer wood assemblage dominated by Podocarpaceae, early Eocene of Laguna del Hunco, central Argentinean Patagonia. PhytoKeys, 156, 81–102. https://doi.org/10.3897/phytokeys.156.54175
  • ^ a b Friis, Else M.; Iglesias, Ari; Reguero, Marcelo A.; Mörs, Thomas (2017-08-01). "Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica". Plant Systematics and Evolution. 303 (7): 969–980. doi:10.1007/s00606-017-1422-y. ISSN 2199-6881. S2CID 254058613.
  • ^ AntarctodonatFossilworks.org
  • ^ TrigonostylopsatFossilworks.org
  • ^ Chornogubsky, L. (2009). A Reassessment of Antarctic Polydolopid Marsupials (Middle Eocene, La Meseta Formation). Antarctic Science.
  • ^ Goin, F. J.; Zimicz, N.; Reguero, M. A.; Santillana, S. N.; Marenssi, S. A.; Moly, J. J. (October 2007). "New marsupial (Mammalia) from the Eocene of Antarctica, and the origins and affinities of the Microbiotheria". Revista de la Asociación Geológica Argentina. 62 (4): 597–603. ISSN 1851-8249. Retrieved 2017-02-12.
  • ^ Tambussi, Claudia & Acosta Hospitaleche, Carolina & Reguero, Marcelo & Marenssi, Sergio. (2006). Late Eocene penguins from West Antarctica: Systematics and biostratigraphy. Geological Society London Special Publications. 258. 145-161. 10.1144/GSL.SP.2006.258.01.11.
  • ^ a b Hospitaleche, C. A., & Reguero, M. (2011). Taxonomic status of the Eocene penguinsOrthopteryx gigasWiman, 1905 andIchtyopteryx gracilisWiman, 1905 from Antarctica. Alcheringa: An Australasian Journal of Palaeontology, 35(3), 463–466. https://doi.org/10.1080/03115518.2011.527476
  • ^ Uchman, Alfred; Andrzej GAŹDZICKI (2006). "New trace fossils from the La Meseta Formation (Eocene) of Seymour Island, Antarctica". Pol. Polar Res. 27: 153–170.
  • ^ Long, Douglas. (1992). Sharks from the La Meseta Formation (Eocene), Seymour Island, Antarctic Peninsula. Journal of Vertebrate Paleontology. 12. 11-32. 10.1080/02724634.1992.10011428.
  • ^ a b c d e f g h Goin, Francisco J. New Discoveries of "Opposum-Like" Marsupials from Antarctica (Seymour Island, Medial Eocene). OCLC 1196811246.
  • ^ a b c d e f g h "Antarctic Paleontological Heritage: Late Cretaceous–Paleogene vertebrates from Seymour (Marambio) Island, Antarctic Peninsula". Advances in Polar Science. 30. 20 August 2019. doi:10.13679/j.advps.2019.0015.
  • ^ Francisco J. Goin; Emma C. Vieytes; Javier N. Gelfo; Laura Chornogubsky; Ana N. Zimicz; Marcelo A. Reguero (2020). "New metatherian mammal from the early Eocene of Antarctica". Journal of Mammalian Evolution. 27 (1): 17–36. doi:10.1007/s10914-018-9449-6. S2CID 91932037.
  • ^ a b c Gelfo, Javier N.; Goin, Francisco J.; Bauzá, Nicolás; Reguero, Marcelo (30 September 2019). "The fossil record of Antarctic land mammals: Commented review and hypotheses for future research". Advances in Polar Science: 274–292. doi:10.13679/j.advps.2019.0021.
  • ^ Cenizo, Marcos; Noriega, Jorge I.; Reguero, Marcelo A. (2016-01-12). "A stem falconid bird from the Lower Eocene of Antarctica and the early southern radiation of the falcons". Journal of Ornithology. 157 (3): 885–894. doi:10.1007/s10336-015-1316-0. hdl:11336/54190. ISSN 2193-7192.
  • ^ a b Acosta Hospitaleche, Carolina; Jones, Washington (2024). "Were terror birds the apex continental predators of Antarctica? New findings in the early Eocene of Seymour Island". Palaeontologia Electronica. doi:10.26879/1340.
  • ^ Mörs, Thomas; Reguero, Marcelo; Vasilyan, Davit (2020-04-23). "First fossil frog from Antarctica: implications for Eocene high latitude climate conditions and Gondwanan cosmopolitanism of Australobatrachia". Scientific Reports. 10 (1): 5051. Bibcode:2020NatSR..10.5051M. doi:10.1038/s41598-020-61973-5. ISSN 2045-2322. PMC 7181706. PMID 32327670.
  • ^ Engelbrecht; Mörs; Reguero; Kriwet, Andrea; Thomas; Marcelo A.; Jürgen (May 2017). "A new saw shark, Pristiophorus laevis, from the Eocene of Antarctica with comments on Pristiophorus lanceolatus". Historical Biology. 29 (6): 841–853. doi:10.1080/08912963.2016.1252761. PMC 5447807. PMID 28579693.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  • ^ Bieńkowska-Wasiluk, M.; Bonde, N.; Møller, P. R.; Gaździcki, A. (2013). "Eocene relatives of cod icefishes (Perciformes: Notothenioidei) from Seymour Island, Antarctica". Geological Quarterly. 57 (4). ISSN 1641-7291.

    • Further reading[edit]


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