An Eocene wrasse (Perciformes; Labridae) from Seymour Island

1992 ◽  
Vol 4 (2) ◽  
pp. 235-237 ◽  
Author(s):  
Douglas J. Long
Keyword(s):  
Climatic Change ◽  
Trophic Structure ◽  
Late Eocene ◽  
Pharyngeal Tooth ◽  
Tooth Plate ◽  
Antarctic Waters ◽  
La Meseta Formation ◽  
First Occurrence ◽  
Wide Scale ◽  
Seymour Island

A nearly complete lower pharyngeal tooth-plate from a large (over 60 cm long) fossil wrasse (Perciformes: Labridae) was recently recovered from the middle to late Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula. This find increases the number of teleosts from the Eocene of Antarctica to five taxa, and further illustrates the diversity of the ichthyofauna in the Eocene Weddellian Sea prior to wide-scale climatic change in the Southern Ocean. The fossil wrasse represents the first occurrence of this family in Antarctica, and is one of the oldest fossils of this family from the Southern Hemisphere. Wrasses are not found in Antarctic waters today, and probably became extinct during the Oligocene due to a combination of climatic change, loss of shallow-water habitat, and changes in the trophic structure of the Wedell Sea.

The youngest record of fossil land mammals from Antarctica; its significance on the evolution of the terrestrial environment of the Antarctic Peninsula during the late Eocene

1997 ◽  
Vol 71 (2) ◽  
pp. 348-350 ◽  
Author(s):  
S. F. Vizcaino ◽  
M. Bond ◽  
M. A. Reguero ◽  
R. Pascual
Keyword(s):  
Antarctic Peninsula ◽  
Present Note ◽  
Late Eocene ◽  
South American ◽  
Terrestrial Environment ◽  
Shallow Marine ◽  
Early Oligocene ◽  
La Meseta Formation ◽  
The Antarctic ◽  
Seymour Island

The record of fossil land mammals from Antarctica has been restricted previously to the middle levels of the Eocene-?early Oligocene La Meseta Formation in Seymour Island, Antarctic Peninsula. This mostly shallow-marine sequence was divided informally into seven subunits (Tertiary Eocene La Meseta or TELM 1 to 7) by Sadler (1988). Land mammals, representing South American lineages of marsupials, edentates, and ungulates were recovered from TELM 3, 4, and 5 (Marenssi et al., 1994; Vizcaíno et al., 1994). The purpose of the present note is to report the discovery of a well-preserved ungulate tooth from the uppermost level of the La Meseta Formation (TELM 7) and to discuss its paleoenvironmental implications.

scholarly journals First articulated skeleton of Palaeeudyptes gunnari from the late Eocene of Isla Marambio (Seymour Island), Antarctica

2010 ◽  
Vol 22 (3) ◽  
pp. 289-298 ◽  
Author(s):  
Carolina Acosta Hospitaleche ◽  
Marcelo Reguero
Keyword(s):  
Late Eocene ◽  
La Meseta Formation ◽  
Systematic Determination ◽  
Specific Assignment ◽  
Seymour Island

AbstractThe first articulated skeleton of a penguin from the late Eocene of Antarctica is described. MLP 96-I-6-13 comes from the upper Submeseta Allomember (La Meseta Formation) of Isla Marambio (locality DPV 10/84). The significance of this finding in the context of the Anthropornis nordenskjoeldi biozone is discussed. An osteologic description of the recovered elements and a brief discussion of its systematic determination are provided. MLP 96-I-6-13 is the first articulated skeleton with sure specific assignment to Palaeeudyptes gunnari (Wiman, 1905), a species previously known only through isolated tarsometatarsi and included in the groups of Wiman.

Record of Late Miocene glacial deposits on Isla Marambio (Seymour Island), Antarctic Peninsula

2009 ◽  
Vol 22 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Sergio A. Marenssi ◽  
Silvio Casadío ◽  
Sergio N. Santillana
Keyword(s):  
Antarctic Peninsula ◽  
Late Miocene ◽  
Late Eocene ◽  
Weddell Sea ◽  
Volcanic Group ◽  
Lower Oligocene ◽  
La Meseta Formation ◽  
James Ross Island ◽  
Stratigraphic Sequences ◽  
Seymour Island

AbstractWe report and describe two new small diamictite outcrops on Isla Marambio (Seymour Island), Antarctic Peninsula. These rocks rest on an erosional unconformity on top of the Eocene La Meseta Formation and are unconformably covered by glaciomarine rocks of the ?Pliocene–Pleistocene Weddell Sea Formation. The lithology, fossil content and isotopic ages obtained strongly suggest that the rocks belong to the Hobbs Glacier Formation and support a Late Miocene age for this unit. Additionally, the dated basalt clast provides the oldest age (12.4 Ma) for the James Ross Island Volcanic Group recorded up to now. The here described diamictite cannot be confidently correlated with a glaciomarine unit previously assigned to the Late Eocene–Lower Oligocene taken as proof that initial expansion of ice on Antarctica encompassed the entire continent synchronously in the earliest Oligocene. However, it is now evident that there are likely to be more, short but important, stratigraphic sequences of key regional and Antarctic wide interest preserved on the plateau of Isla Marambio.

A new Eocene crab (Crustacea, Decapoda) from Seymour Island, Antarctica

1995 ◽  
Vol 7 (3) ◽  
pp. 277-281 ◽  
Author(s):  
María B. Aguirre-Urreta ◽  
Sergio Marenssi ◽  
Sergio Santillana
Keyword(s):  
New Zealand ◽  
High Latitude ◽  
Late Eocene ◽  
Early Tertiary ◽  
La Meseta Formation ◽  
Seymour Island

A new xanthid crab, Tumidocarcinus foersteri n. sp. is described from the La Meseta Formation on Seymour Island, Antarctica. The fossils were obtained from the Allomember Submeseta of Late Eocene age. As other representatives of the genus Tumidocarcinus were only known from New Zealand and Australia, this finding provides new insights on the palaeobiogeography of high latitude faunas during the Early Tertiary.

Note on the Antarctic Tertiary brachiopods and museum registry of specimens described by E. F. Owen, 1980

1989 ◽  
Vol 63 (6) ◽  
pp. 955-955
Author(s):  
William J. Zinsmeister
Keyword(s):  
Natural History ◽  
Austral Summer ◽  
British Museum ◽  
Late Eocene ◽  
British Antarctic Survey ◽  
La Meseta Formation ◽  
The Antarctic ◽  
Seymour Island

During the course of fieldwork by a joint Argentine-American expedition to Seymour Island (Elliot et al., 1975) during the austral summer of 1974-1975, a number of brachiopods were collected from the Late Eocene La Meseta Formation. A representative collection of these brachiopods was sent to E. F. Owen, Department of Palaeontology, British Museum (Natural History) for study. Owen (1980) published a revision of the brachiopods from Seymour and nearby Cockburn Islands. The study was based on material collected by W. N. Croft of the Faulkland Islands Dependencies Survey (now British Antarctic Survey) and the material which I sent.

Late Eocene Decapod Crustacea from North Westland, South Island, New Zealand

1990 ◽  
Vol 64 (5) ◽  
pp. 779-797 ◽  
Author(s):  
Rodney M. Feldmann ◽  
Phillip A. Maxwell
Keyword(s):  
New Zealand ◽  
Deep Water ◽  
Middle Eocene ◽  
Late Eocene ◽  
Decapod Crustaceans ◽  
Fecal Pellets ◽  
Decapod Crustacea ◽  
La Meseta Formation ◽  
Seymour Island ◽  
Water Facies

Eight species of brachyuran decapod crustaceans are recorded from coastal outcrops of Island Sandstone between Perpendicular Point and Punakaiki, Westland, New Zealand. The fauna consists of three raninids—Laeviranina pororariensis (Glaessner), L. keyesi n. sp., Lyreidus bennetti n. sp.; two portunids—Rhachiosoma granuliferum (Glaessner), Pororaria eocenica Glaessner; a goneplacid—Carcinoplax temikoensis n. sp.; and two majids—Leptomithrax griffini n. sp., Notomithrax allani n. sp. Together, they form the most diverse brachyuran assemblage yet described from New Zealand. The decapods are preserved in unusual elliptical masses, with their long axes typically parallel to bedding, containing superbly preserved cuticle often surrounded by well-formed fecal pellets, probably of decapod origin. The accumulations are interpreted to be mechanical concentrations within depressions produced by decapods or associated spatangoid echinoids. Although seven of the species have been recorded only from the Island Sandstone, Rhachiosoma granuliferum (Glaessner) is now known to occur in the correlative deep-water facies of the Kaiata Formation in North Westland, as well as in the Tapui Sandstone, North Otago (middle Eocene), and from coeval rocks at Snowdrift Quarry, southeast Otago. The raninids suggest comparison with congeneric forms from Snowdrift Quarry and the Tapui Sandstone, as well as with the La Meseta Formation, Seymour Island, Antarctica. Based upon associated foraminiferans, a Kaiatan–Runangan (late Eocene) age is assigned to this fauna. The occurrences of Carcinoplax, Leptomithrax, and Notomithrax represent paleobiogeographic and stratigraphic records for the genera.

Short Note: An ibis-like bird from the Upper La Meseta Formation (Late Eocene) of Seymour Island, Antarctica

2008 ◽  
Vol 20 (4) ◽  
pp. 413-414 ◽  
Author(s):  
Piotr Jadwiszczak ◽  
Andrzej GaŹdzicki ◽  
Andrzej Tatur
Keyword(s):  
Middle Eocene ◽  
Short Note ◽  
Late Eocene ◽  
Taxonomic Position ◽  
Tierra Del Fuego ◽  
Wading Birds ◽  
The Family ◽  
La Meseta Formation ◽  
Fossil Bones ◽  
Seymour Island

Ibises are a group of medium- to large-sized, mainly wading birds in the family Threskiornithidae (Aves: Ciconiiformes; see also discussion in Mayr 2002). They are known from all the continents except Antarctica, though one species breeds as far south as Tierra del Fuego (del Hoyoet al.1992, p. 499). The oldest fossil bones (including skull elements) attributed to ibises are those ofRhynchaeites messelensisWittich, 1898 from the Middle Eocene of Messel, Germany (Peters 1983, Mayr 2002). Another supposed member of this group is the Pondaung bird from the late Middle Eocene of Myanmar (formerly Burma) represented solely by an incomplete tibiotarsus (Stidhamet al.2005, fig. 2). The taxonomic position ofMinggangia changgouensisHou, 1982 from the Late Eocene of China (Hou 1982) was recently questioned by Stidhamet al.(2005, p. 183). Here, we present a partial bill from the Eocene La Meseta Formation (Seymour Island, Antarctica) which most closely resembles that of ibises.

Eocene microplankton from La Meseta Formation, northern Seymour Island

1992 ◽  
Vol 4 (3) ◽  
pp. 355-362 ◽  
Author(s):  
Christopher D. Cocozza ◽  
Ciara M. Clarke
Keyword(s):  
Late Eocene ◽  
Early Eocene ◽  
Shallow Marine ◽  
Dinoflagellate Cyst ◽  
Two Samples ◽  
Low Diversity ◽  
La Meseta Formation ◽  
Marine System ◽  
Near Shore ◽  
Seymour Island

Twenty two samples collected from the Tertiary La Meseta Formation of Cape Wiman, Seymour Island, Antarctic Peninsula yielded abundant and moderately diverse assemblages of marine palynoflora, dominated by dinoflagellate cysts, together with acritarchs and chlorophyta. The assemblages can be divided into three association: Association 1, characterized by low diversity dinoflagellate assemblage of late Early Eocene age which are dominated by Enigmadinium cylindrifloriferum; Association 2 characterized by more diverse dinoflagellate cyst assemblages, which show a marked decrease in the dominance of E. cylindrifloriferum, and an increase in relative abundance of Areosphaeridium cf. diktyoplokus; and Association 3 which is characterized by a decrease in dinoflagellate cyst diversity up section. Changes in dinoflagellate cyst dominance and diversity throughout the section suggests a gradation from a stressed, shallow marine palaeoenvironment to a more open near-shore, shallow marine system becoming progressively more nearshore up section. The assemblages are no older than late Early Eocene in age, and possibly as young as Mid–Late Eocene.

Late Eocene gadiform (Teleostei) skull from Seymour Island, Antarctic Peninsula

1991 ◽  
Vol 3 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Joseph T. Eastman ◽  
Lance Grande
Keyword(s):  
Antarctic Peninsula ◽  
Late Eocene ◽  
Climatic Conditions ◽  
Convincing Evidence ◽  
Posterior Half ◽  
Antarctic Region ◽  
La Meseta Formation ◽  
The Antarctic ◽  
First Time ◽  
Seymour Island

On the basis of a skull from the late Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula, a gadiform fish is reported from the Antarctic region for the first time. This specimen, the most completely preserved fossil teleost cranium yet described from Antarctica, provides convincing evidence for the presence of Gadiformes in a far southerly location under temperate climatic conditions 40 m.y. ago. The exoccipital condyles, supraoccipital and lambdoidal crests, and post-temporal and supratemporal fossae are well preserved, as are the roofing bones on the posterior half of the skull. Comparative osteological study indicates that these features are very similar in appearance to those of merlucciids (hakes) and gadids (cods).

A traumatic fracture in a giant Eocene penguin from Antarctica

2012 ◽  
Vol 24 (6) ◽  
pp. 619-624 ◽  
Author(s):  
Carolina Acosta Hospitaleche ◽  
Leandro M. Perez ◽  
Walter Acosta ◽  
Marcelo Reguero
Keyword(s):  
Late Eocene ◽  
Mineral Deposit ◽  
Butterfly Wing ◽  
Indirect Mechanism ◽  
Traumatic Fracture ◽  
Main Fracture ◽  
La Meseta Formation ◽  
The Impact ◽  
Seymour Island

AbstractA fractured femur of a giant fossil penguin from the Anthropornis nordenskjoeldi Biozone (Late Eocene), Isla Marambio (Seymour Island), Antarctica (La Meseta Formation) is described. Palaeoecological, palaeopathological and taphonomical implications derived from the analysis of the kinds of fractures identified are also discussed. The main fracture has irregular margins, indicating there was collagen in the bone at the time of the impact. In this fracture, a mineral deposit was also identified as a fracture hematoma. According to the antemortem classification of fractures, it was produced by an indirect mechanism, provocating a “butterfly wing” or “third fragment” fracture. The remaining fractures are assigned to times of biostratinomic and fossil diagenesis.

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