Results 111 to 120 of about 225 (146)

Unusual nautilid occurrence in the upper Eocene La Meseta Formation, Seymour Island, Antarctica

Journal of Paleontology, 1987
The presence of large numbers of phragmocones of Eutrephoceras and Aturia in an upper Eocene beach deposit of the La Meseta Formation on Seymour Island is the first known occurrence of beach-drifted accumulations of nautilid shells in the fossil record and may also represent the first documentation of a mass stranding of nautilids in the Cenozoic.
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Dinoflagellate cysts of the La Meseta Formation (middle to late Eocene), Antarctic Peninsula: implications for biostratigraphy, palaeoceanography and palaeoenvironment

Geological Magazine, 2019
AbstractDinoflagellate cyst assemblages recovered from the La Meseta Formation cropping out in Seymour Island, Antarctic Peninsula, are studied herein and their distribution is compared with the biostratigraphic scheme available for the Palaeogene of the Southern Ocean and other high-latitude regions.
Cecilia R. Amenábar, Manuel Montes, Francisco Nozal, Sergio Santillana   +3 more
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Provenance, environmental and paleogeographic controls on sandstone composition in an incised-valley system: the Eocene La Meseta Formation, Seymour Island, Antarctica

Sedimentary Geology, 2002
Abstract The Eocene La Meseta Formation is the youngest exposed unit of the back-arc James Ross Basin, Antarctic Peninsula, cropping out in Seymour (Marambio) Island. The formation comprises 720 m of clastic sedimentary rocks of deltaic, estuarine and shallow marine origin.
Sérgio A Marenssi, Laura I Net
exaly   +2 more sources

A New Cetacean from the Late Eocene La Meseta Formation Seymour Island, Antarctic Peninsula

Canadian Journal of Fisheries and Aquatic Sciences, 1989
The new genus and species Llanocetus denticrenatus is described based on a cranial endocast and portion of a dentary fragment bearing two teeth from the Eocene La Meseta Formation, Seymour Island, Antarctic Penninsula. Llanocetus new genus is designated the type genus for the new family Llanocetidae. The Llanocetidae is placed within the new infraorder
exaly   +2 more sources

Penguin cranial remains from the Eocene La Meseta Formation, Isla Marambio (Seymour Island), Antarctic Peninsula

Antarctic Science, 2011
AbstractWidely accepted ideas about trophic preferences of early penguins suggest that all Eocene sphenisciforms were piscivorous. However, recent findings from the La Meseta Formation (Eocene) of Antarctica, support the presence of at least two different morphotypes that may have evolved as a niche partitioning strategy, which is consistent with the ...
Carolina Acosta Hospitaleche, Nadia Haidr   +1 more
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Short Note: An ibis-like bird from the Upper La Meseta Formation (Late Eocene) of Seymour Island, Antarctica

Antarctic Science, 2008
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).
Piotr Jadwiszczak, Andrzej GaŹdzicki, Andrzej Tatur   +2 more
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Decapod crustaceans from the Eocene La Meseta Formation, Seymour Island, Antarctica: a model for preservation of decapods

Journal of the Geological Society, 2003
Thirteen species of fossil decapod crustaceans collected from 43 localities in the La Meseta Formation (Eocene), Seymour Island, Antarctica, have been located precisely using global positioning system techniques and accurately placed in their stratigraphic context using an allostratigraphic scheme. Three decapod species are congeneric with
R.M. Feldmann, C.E. Schweitzer, S.A. Marenssi   +2 more
exaly   +2 more sources

Angular unconformity between the López de Bertodano and La Meseta formations (Campanian-Maastrichtian and Eocene), Cockburn Island, northern Antarctic Peninsula

Journal of South American Earth Sciences, 1994
A thick, largely shallow marine succession of Cretaceous and Lower Tertiary strata, deposited in the James Ross Basin, is well exposed on an archipelago of islands at the northern end of the Antarctic Peninsula. This succession was thought to be relatively continuous, particularly on Seymour Island where a thick Upper Cretaceous succession passes up ...
Barnes, R.P., Riding, J.B.
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Evolution of the Antarctic bryozoan biota as a response to environmental and climatic changes: (Eocene, La Meseta Formation, Seymour Island, Antarctic Peninsula)

2022
<p>The Eocene bryozoans reveal a spectacular diversification in the stratigraphical column of the LMF, Seymour Island, showing a great variation in the colony growth-forms and taxonomy enhanced by a great radiation of a new taxa (Hara 2001).</p><p>The very base of the sandy, transgressive series in the ...
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Marine high Mg calcite cements in Teredolites-bored fossil wood; evidence for cool paleoclimates in the Eocene La Meseta Formation, Seymour Island, Antarctica

PALAIOS, 1998
Abstract Aims to describe petrography and geochemistry of calcite cements precipitated in species borings from the lower 180m of La Meseta Formation on island. Interprets data in terms of diagenetic history of wood substrates and paleoclimatic significance of the cement.
Pirrie, Duncan, Marshall, James D., Crame, J. Alistair   +2 more
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