Geological evolution of the earth during the precambrian [Libro electrónico] / autor: Lazarus J. Salop
Por: Salop, Lazarus J [autor/a].
Tipo de material: Libro en línea Editor: New York, New York, United States: Springer-Verlag, c1983Descripción: xii, 459 páginas : ilustraciones ; 25 centímetros.ISBN: 0387117091; 9783642686863 (Print); 9783642686849 (Online).Tema(s): Precambrian | Geología estratigráficaNota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso Nota de bibliografía: Incluye bibliografía e índice: páginas 410-433 Número de sistema: 56061Contenidos:Mostrar Resumen:Tipo de ítem | Biblioteca actual | Colección | Signatura | Estado | Fecha de vencimiento | Código de barras |
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Libros | Biblioteca Electrónica Recursos en línea (RE) | Acervo General | Recurso digital | ECO400560617959 |
Incluye bibliografía e índice: páginas 410-433
1. General problems in division of the Precambrian.. 2. The katarchean.. 3. The paleoprotozoic (archeoprotozoic.. 4. The mesoprotozoic.. 5. The neoprotozoic.. 6. The epiprotozoic.. 7. The eocambrian (vendian sensu stricto.. 8. Geologic synthesis.. Subject Index
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Progress in Precambrian geology has been exceptionally great, indeed quite striking for geologists of the older generation; only some 30-40 years ago the Precambrian appeared as an uncertain and even mystic prelude to geologic evolution. Even the very name - Precambrian - means some indi visible unit in the early history of the Earth, the beginning of which is poorly known. At the same time it was obvious that the Precambrian formations are of extremely varied and complex composition and poor knowledge and lack of reliable methods of division and correlation were to blame for the lack of significant progress in studies of this early evolutionary stage of the planet. Certainly, even at the very start of Precambrian studies, the results obtained were quite promising, lifting as they did the mysterious veil over the regional Precambrian; but they presented no general realistic picture of this early stage in the Earth's evolution at that time. Recently, this situation has completely changed, due to new methods of study of the older forma tions, and due also to the refinement of some well-known methods, in particular of division, dating, and correlation of "silent" metamorphic strata. Application of different isotope methods of dating was most impor tant in providing objective rock age and thereby the age of geologic events recorded in these rocks. Thus it became possible to reconstruct the oldest geologic period of our planet. eng
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