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Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula
Get PDFTo date, Cretaceous nautilids from the Antarctic Peninsula have received little attention and only a single species had been reported, Eutrephoceras simile Spath, from Seymour, Snow Hill, and James Ross islands. Currently, it is considered a synonym of Eutrephoceras subplicatum (Steinmann), which has also been described from the Upper Cretaceous of central Chile, southern Argentina and Angola. Here, we report and describe E. subplicatum in detail, based on specimens from the Lower Campanian–Maastrichtian of Vega, Seymour and James Ross islands, presenting, for the first time, embryonic conch features related to the palaeoecology of these organisms. The nauta of this species had a diameter of approximately 30 mm with 5–6 septa. In addition, we describe a new species, Eutrephoceras antarcticum, and one specimen assigned to the same genus in open nomenclature, both recovered from the Lower Campanian beds of James Ross Island.Fil: Cichowolski, Marcela. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ambrosio, Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina. Universidad de Buenos Aires; ArgentinaFil: Concheyro, Graciela. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Meteorological data from 2017-2019 on the plateau of James Ross Island, Antarctic Peninsula
No full textThese data describe meteorological measurements on the plateau of James Ross Island [Position: 64.19889°S 57.59761°W]. Specifications of the applied sensors and their mounting heights are described in the attached metadata. All measurements (except of Relative Humidity with one sample measurement per hour) were done with a scanning interval of 10 seconds, and afterwards averaged over one hour. In the case of the sonic ranging sensor and the firn compaction, measurements were done for only 5 minutes per hour due to power consumptions. All data are only filtered by outliers which were easy to discover. Thus, erroneous measurements (e.g., in the case of the sonic raning sensor), can still be part of the data
(Table 3) Abundance of common benthic freshwater diatom species on northern James Ross Island
No full text(Table 3) Abundance of common benthic freshwater diatom species on northern James Ross Islan
Main, James Ross, [No Service Number]
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/401136Surname: MAIN. Given Name(s) or Initials: JAMES ROSS. Military Service Number or Last Known Location: [No Registration Number]. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 34377.220782
Item: [2016.0049.33429] "Main, James Ross, [No Service Number]
(Table 2) Abundance of benthic freshwater diatom species in streams and seepage areas of northern James Ross Island
No full text(Table 2) Abundance of benthic freshwater diatom species in streams and seepage areas of northern James Ross Islan
Ekosystém jezer ostrova James Ross - krátká charakteristika
No full textWe present a short overview of lakes of James Ross Island, their origin, geomorphological and hydrological position, physical, chemical and biological characteristics
Geologica del Cuaternario de la Isla James Ross informe preliminar
No full textJames Ross Island, Antarkti
MOSASAURS FROM THE JAMES ROSS BASIN, ANTARCTICA
Get PDFFil: Fernández, Marta S. Universidad Nacional de La Plata. Museo de La Plata. División Paleontología de Vertebrados. Buenos Aires, Argentina.Fil: Talevi, Marianella. Universidad Nacional del Comahue. Museo de Geología y Paleontología. Neuquén, Argentina.Fil: Reguero, Marcelo A. Museo de La Plata. División Paleontología Vertebrados. Bueno Aires, Argentina.Fil: Martin, James E. South Dakota School of Mines and Technology. Museum of Geology. Rapid City, USA.Mosasaurs were diverse and specialized Cretaceous squamate reptiles adapted to marine life. Although mosasaur record is diverse and abundant worldwide, and the knowledge of the group improved during the last years, there are certain geographic areas and stratigraphic horizons in which the records are still scarce. Many years of cooperative explorations and researches of the División Paleontología Vertebrados (Museo de La Plata, Argentina) and the Instituto Antártico Argentino (IAA), Argentina, result in a collection of mosasaur materials from James Ross Basin (NE of the Antarctic Peninsula) that it is of special interest. Campanian and Maastrichtian mosasaurs have been recovered from Santa Marta Formation on James Ross Island, and from López de Bertodano Formation on Vega and Seymour Islands. Systematic analysis on these materials demonstrated the presence of tylosaurine mosasaurs in the Campanian, and the co-occurrence of mosasaurines, tylosaurines, and plioplatecarpines in the Maastrichtian of James Ross Basin. Of special interest is the closely phylogenetic relationship of the tylosaurine Taniwhasaurus antarcticus, from the Late Campanian of James Ross Island, with tylosaurines from the middle Campanian of New Zealand. Analyses of bone microstructure permit to explore interesting aspects of mosasaur ecology. Mosasaurs exhumed from the Fm. López de Bertodano on Seymour Island exhibit two different bone microstructures. This fact suggests that Antarctic mosasaurs could have partitioned the water column
Stromatolites in deglacial lakes of the James Ross Island (Antarctica)
No full textThe baseline limnological survey in deglacial lakes of the James Ross Island
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