Echinoids from the La Meseta Formation (Eocene), Seymour Island, Antarctica

1988 ◽  
pp. 499-504 ◽  
Author(s):  
Michael L. McKinney ◽  
Kenneth J. McNamara ◽  
Lawrence A. Wiedman
Keyword(s):  
La Meseta Formation ◽  
Seymour Island

scholarly journals GLOTTIDIA (BRACHIOPODA: LINGULIDAE) FROM THE EOCENE LA MESETA FORMATION, SEYMOUR ISLAND, ANTARCTICA

Palaeontology ◽  
2005 ◽  
Vol 48 (2) ◽  
pp. 423-431 ◽  
Author(s):  
CHRISTIAN C. EMIG ◽  
MARIA ALEKSANDRA BITNER
Keyword(s):  
La Meseta Formation ◽  
Seymour Island

Remarkably preserved annelid worms from the La Meseta Formation (Eocene), Seymour Island, Antarctica

Palaeontology ◽  
2005 ◽  
Vol 48 (1) ◽  
pp. 1-13 ◽  
Author(s):  
CARRIE E. SCHWEITZER ◽  
RODNEY M. FELDMANN ◽  
SERGIO MARENSSI ◽  
DAVID A. WAUGH
Keyword(s):  
La Meseta Formation ◽  
Seymour Island

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.

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.

Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica

2015 ◽  
Vol 89 (5) ◽  
pp. 870-881 ◽  
Author(s):  
Marcos Cenizo ◽  
Carolina Acosta Hospitaleche ◽  
Marcelo Reguero
Keyword(s):  
Terminal Group ◽  
Lower Eocene ◽  
Early Oligocene ◽  
Large Size ◽  
La Meseta Formation ◽  
Size Type ◽  
Giant Size ◽  
Phylogenetic Affinities ◽  
The Antarctic ◽  
Seymour Island

AbstractThe Antarctic pelagornithid record is restricted to few isolated remains from the Eocene of Seymour Island in the Antarctic Peninsula. Here we report the oldest Antarctic pseudo-toothed bird. It is represented by an incomplete humerus lacking its proximal end, which comes from the lower Eocene levels of the La Meseta Formation (Seymour Island). This new specimen facilitates a review of all known pelagornithids from this continent. Antarctic pelagornithids were classified into two morphotypes that exhibit a mix of putative plesiomorphic and derived characters. Considering the worldwide pelagornithid record and according to estimated wingspans, four approximate size-types were identified. The oldest Antarctic specimens (two fragmentary humeri, middle Ypresian) were assigned to morphotype 1 and correspond to the large size-type. The younger materials (Bartonian/?Priabonian) here assigned to morphotype 2 (some cranial remains, fragmentary tarsometatarsus and humerus) correspond to the giant size-type and represent one of the largest known pseudo-toothed birds. Even though species level phylogenetic affinities of Pelagornithidae remain poorly resolved, three key evolutionary events can be recognized: (1) the disappearance ofDasornisin the Early Eocene and the appearance of more advanced forms with a trend to the specialization of large soaring capacity, (2) the origin ofPelagornissensu lato species in the early Oligocene, and (3) the appearance and dominance of a highly specialized terminal group at Mio/Pliocene time span.

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