Relaciones bioestratigráficas y paleogeográficas del Paleozoico Superior marino en el Gondwana Sudamericano
1989; National University of Tucumán; Volume: 17; Issue: 1 Linguagem: Inglês
ISSN
1852-6217
Autores Tópico(s)Evolution and Paleontology Studies
ResumoespanolEl patron paleobiogeografico de las faunas marinas del Paleozoico tardio en America del Sur muestra una distribucion en tres reinos principales. Dos de ellos, actualmente ubicados al este de los Andes meridionales, pertenecen a la provincia de Gondwana; son el reino gondwanico central y el reino perigondwanico. Un reino extragondwanico, que muestra afinidades de tipo teciano, se encuentra al oeste del cinturon andino. Las faunas de las facies calidas extragondwanicas eran contemporaneas a las de las facies frias perigondwanicas. A pesar de sus notables caracteristicas generales contrastantes, los conjuntos de fauna en ambos reinos tienen varios taxones en comun, lo que revela que existian algunas relaciones entre ellos. Mas que terrenos sospechosos, esto sugiere que ambos reinos no estaban muy lejos, sino que estaban separados por un brazo de mar, que actuaba como una barrera paleoclimatica solo para algunos grupos de invertebrados. EnglishBiostratigraphic and Paleogeographic relations of the Late Paleozoic marinestrata in the South American Gondwana. The paleobiogeographic pattern of Late Paleozoic marine faunas in South America shows a distribution in three main realms. Two of them, at present time located to the east of the southern Andes, belong to the Gondwana province; they are the central gondwanic realm and the perigondwanic realm. An extragondwanic realm, showing tetian-like affinities, is located to the west of the Andean belt. Faunas from the extragondwanic warm facies were contemporary to those of the perigondwanic cold facies. In spite of their remarkable contrasting general features , faunal assemblages in both realms bear several taxa in common, revealing that some relationships existed between them. Rather than suspected terranes, this suggests that both realms were not far away, but separated by an arm of sea, which acted as a paleoclimatic barrier only to some groups of invertebrates.
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