Hallazgo de icnitas en península Fildes, isla Rey Jorge, archipiélago Shetland del Sur, Antártica
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Date
1970
Journal Title
Journal ISSN
Volume Title
Publisher
Instituto Antártico Chileno
Abstract
En el presente trabajo se informa por primera vez del hallazgo de icnitas de vertebrados en el Continente Antártico. Estas se encontraron en la Península Fildes, Isla Rey Jorge, Archipiélago Shetland del Sur. Las rocas portadoras de las icnitas son tufitas que se encuentran en la parte alta de una secuencia volcánica y sedimentario-volcánica que se habría depositado en un ambiente lacustre. Estas capas contienen flora fósil de edad oligocena-miocena media. Las impresiones de las pisadas corresponden a un ave pequeña, de andar bipedal erguido, pie tetradígito y dedos leptodáctilos de diferente tamaño, sin membrana interdigital. El estudio sistemático de las icnitas conduce a asimilarlas a un ave ,del Orden Gruiformes, Familia Rallidae, proponiéndose un nuevo género y especie para esta forma que denominamos Antarctichnus fuenzalidae.
A finding of bird tracks (ichnites), the first of this type recorded for the Antarctic Continent, is reported. The locality lies in Peninsula Fildes, King George Island, South Shetland Archipielago. The tracks are in tuffaceous sediments forming the upper part of a volcanic and sedimentary-volcanic sequence deposited under a lacustrine environment. An Oligocene-middle Miocene flora is associated with the ichnites. The tracks belong to a small bird of bipedal erect walk and tetradigit feet, having leptodactiles, unequal-sized fingers, without interfinger web. The systematic study indicates that the tracks are of a bird belonging to the Order Gruiformes, family Rallidae. A new genus and species Antarctichnus fuenzctlidae - is here proposed on the basis of these tracks.
A finding of bird tracks (ichnites), the first of this type recorded for the Antarctic Continent, is reported. The locality lies in Peninsula Fildes, King George Island, South Shetland Archipielago. The tracks are in tuffaceous sediments forming the upper part of a volcanic and sedimentary-volcanic sequence deposited under a lacustrine environment. An Oligocene-middle Miocene flora is associated with the ichnites. The tracks belong to a small bird of bipedal erect walk and tetradigit feet, having leptodactiles, unequal-sized fingers, without interfinger web. The systematic study indicates that the tracks are of a bird belonging to the Order Gruiformes, family Rallidae. A new genus and species Antarctichnus fuenzctlidae - is here proposed on the basis of these tracks.
Description
Keywords
Icnitas, Geología, Flora fósil
Citation
Serie Científica, Vol. 1, nº 1, pp. 57-74, 1970