Shallow-water late middle Eocene crinoids from Tierra del Fuego: a new southern record of a retrograde community structure

Malumián, Norberto; Olivero, Eduardo B.

doi:10.3989/scimar.2005.69s2349

Cited by 15 publications

(21 citation statements)

References 12 publications

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“…The late Paleocene Cabo Leticia and Punta Noguera formations yield unidentified shell fragments and oysters (Olivero et al, 2002) and the supposedly Paleocene assemblage described by Camacho (1957) and Buatois and Camacho (1993), from the Río Claro formation, actually belongs in the Leticia formation of middle Eocene age (Malumián and Olivero, 2005). Concheyro, 1992;Concheyro and Nañez, 1994;Concheyro and Villa, 1996;Nañez and Concheyro, 1997;Papu et al, 1999;del Río et al, 2007).…”

Section: 4-austral Basinmentioning

confidence: 95%

Paleobiogeography of the Danian molluscan assemblages of Patagonia (Argentina)

Río

Martínez

2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: 4-austral Basinmentioning

confidence: 95%

Paleobiogeography of the Danian molluscan assemblages of Patagonia (Argentina)

Río

Martínez

2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…8). Northward, the extreme record of this transgression is a briozoal limestone outcropping at the locality of Puesto del Museo (Panza, Náñez & Malumián, 1998); southward, on the island of the Tierra del Fuego, it is characterized by a retrograde assemblage with large‐sized nodosarid foraminifera (Figs 3–6, 7) associated with a high abundance of crinoidal remains, constituting an event shared with Antarctica (Malumián & Olivero, 2005a).…”

Section: The Atlantic Transgressionsmentioning

confidence: 99%

The Late Cretaceous-Cenozoic transgressions in Patagonia and the Fuegian Andes: foraminifera, palaeoecology, and palaeogeography

Malumián

Náñez

2011

Biological Journal of the Linnean Society

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142

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In southernmost South America, several ephemeral Atlantic transgressions flooded the Patagonian Platform: in the Maastrichtian‐Danian, late Mid‐Eocene, Late Oligocene‐Early Miocene, and Middle Miocene; only in the Fuegian Andes did marine conditions remain continuously from the Maastrichtian up to the Middle Miocene. In the Maastrichtian, the calcareous foraminiferal benthic assemblages contain endemic species, and most of them disappear in the Cretaceous–Palaeogene transition. The Palaeocene carries the extinct cosmopolitan Midway type assemblage with few endemic taxa such as Buliminella isabelleana, and the genera Antarcticella and Boltovskoyella. The Palaeocene/Eocene turnover gives room to assemblages of modern and marked Austral aspect: Elphidiidae dominates in shallow environments, including genera endemic to high and mid‐high southern latitudes such as Cribrorotalia. The Late Middle Eocene transgression is characterized by large nodosarids in the Fuegian area and the spreading of Elphidium saginatum. The Late Oligocene transgression is of limited extension and shallow waters, with abundant Buccella and the conspicuous genus Discorotalia. The Early Miocene transgression carries the extinct and typical Antarctic genus Ammoelphidiella and witnesses the origin of the modern Patagonian coastal assemblage, characterized by its pauperism and the dominance of the genus Buccella. The Middle Miocene transgression covers mainly northern Argentina. Considering that the late Middle Eocene and Middle Miocene transgressions are coeval with relative climatic optima, and in comparison with assemblages at similar palaeolatitudes elsewhere in the Southern Hemisphere, the absence of larger foraminifera or thermophilic forms in the Patagonian and Fuegian assemblages is outstanding. © 2011 The Linnean Society of London, Biological Journal of the Linnean Society, 2011, 103, 269–288. En el extremo austral de América del Sur, varias transgresiones efímeras inundaron la Plataforma Patagónica: en el Maastrichtiano‐Daniano, Eoceno Medio Tardío, Oligoceno Tardío‐Mioceno Temprano, y en el Mioceno Medio; sólo en los Andes Fueguinos las condiciones marinas permanecieron desde el Maastrichtiano hasta el Mioceno Medio. En el Maastrichtiano, las asociaciones de foraminíferos bentónicos contienen especies calcáreas endémicas, que en su mayoría desaparecen en la transición Cretácico/Paleógeno. El Paleoceno porta la asociación cosmopolita extinta del tipo Midway, con pocos taxones endémicos tales como Buliminella isabelleana, y los géneros Antarcticella y Boltovskoyella. El recambio del límite Paleoceno/Eoceno da lugar a asociaciones de aspecto moderno y marcadamente austral: los Elphidiidae dominan en los ambientes someros, incluyendo géneros endémicos de altas y medias altas latitudes australes tales como Cribrorotalia. La transgresión del Eoceno Medio Tardío está caracterizada por grandes nodosáridos en el área fueguina y por la dispersión de Elphidium saginatum. La transgresión del Oligoceno Tardío, de limitada extensión y de aguas someras...

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“…-Accessible fossil evidence is restricted to few sites in the Antarctic (Taviani et al, 1998;Crame, 1999;Malumian and Olivero, 2005), and the record is only slowly improving.…”

Section: Deficiencies and Perspectivesmentioning

confidence: 99%

The Antarctic-Magellan connection: macrobenthos ecology on the shelf and upper slope, a progress report

Arntz¹,

Thatje²,

Gerdes³

et al. 2005

Sci. Mar.

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SUMMARY: Ecological work carried out on the Antarctic and Magellan shelves since the first IBMANT conference held at the UMAG, Punta Arenas in 1997 is summarized to identify areas where progress has been made and others, where important gaps have remained in understanding past and present interaction between the Antarctic and the southern tip of South America. This information is complementary to a review on shallow-water work along the Scotia Arc (Barnes, 2005) and recent work done in the deep sea (Brandt and Hilbig, 2004). While principally referring to shipboard work in deeper water, above all during the recent international EASIZ and LAMPOS campaigns, relevant work from shore stations is also included. Six years after the first IBMANT symposium, significant progress has been made along the latitudinal gradient from the Magellan region to the high Antarctic in the fields of biodiversity, biogeography and community structure, life strategies and adaptations, the role of disturbance and its significance for biodiversity, and trophic coupling of the benthic realm with the water column and sea ice. A better understanding has developed of the role of evolutionary and ecological factors in shaping past and present-day environmental conditions, species composition and distribution, and ecosystem functioning. Furthermore, the science community engaged in unravelling Antarctic-Magellan interactions has advanced in methodological aspects such as new analytical approaches for comparing biodiversity derived from visual methods, growth and age determination, trophic modelling using stable isotope ratios, and molecular approaches for taxonomic and phylogenetic purposes. At the same time, much effort has been invested to complement the species inventory of the two adjacent regions. However, much work remains to be done to fill the numerous gaps. Some perspectives are outlined in this review, and suggestions are made where particular emphasis should be placed in future work, much of which will be developed in the frame of SCAR's EBA (Evolution and Biodiversity in the Antarctic) programme.Keywords: macrobenthos, Antarctic, Magellan region, biodiversity, biogeography, ecology, evolution, disturbance.RESUMEN: LA CONEXIÓN ANTÁRTICO-MAGALLÁNICA: ECOLOGÍA DEL MACROBENTOS EN LA PLATAFORMA Y TALUD SUPERIOR, UN INFORME SOBRE LA LABOR REALIZADA. -Las investigaciones ecológicas llevadas a cabo en la plataforma antártica y de Magallanes, desde la primera reunión del IBMANT en Punta Arenas en el año 1997, se resumen en este trabajo, con el fin de identificar las áreas en que se han realizado progresos considerables, así como aquellas en las que aún quedan muchos aspectos por cubrir para poder comprender tanto el pasado como el presente de las interacciones entre las áreas antárticas y el "Cono Sur" de Sudamérica. La información que aquí se ofrece complementa la revisión de los trabajos realizados en aguas someras a lo largo del Arco de Scotia (Barnes, 2005) así como los trabajos más recientes ejecutados en el mar profundo (Brandt and Hil...

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Shallow-water late middle Eocene crinoids from Tierra del Fuego: a new southern record of a retrograde community structure

Cited by 15 publications

References 12 publications

Paleobiogeography of the Danian molluscan assemblages of Patagonia (Argentina)

Paleobiogeography of the Danian molluscan assemblages of Patagonia (Argentina)

The Late Cretaceous-Cenozoic transgressions in Patagonia and the Fuegian Andes: foraminifera, palaeoecology, and palaeogeography

The Antarctic-Magellan connection: macrobenthos ecology on the shelf and upper slope, a progress report

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