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By Martin Keller

ISBN-10: 0813723418

ISBN-13: 9780813723419

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Additional info for Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America (Special Paper (Geological Society of America))

Sample text

The map shown in the paper (Serpagli, 1974, p. 4) indicates a position between the Pachaco and the Tambolar sections. , when dating the top of the formation. Lehnert (1995a), considering the Pachaco locality (Fig. 3) as the original described section, pointed out the discrepancies between his data from the Pachaco section and those of Serpagli (1974). However, if it is assumed that the samples were originally obtained from the Tambolar section (Fig. 3), the Serpagli data fit those of Lehnert (1995a, 1995b) and thicknesses given in Serpagli (1974), and those reported herein are almost identical (Fig.

20). Sedimentation of the La Silla Formation began above a distinctive surface, which in the type section is characterized by the presence of dark silty dolomites. The change from peritidal dolomites of the La Flecha Formation with abundant chert and evaporites toward grainstones with mud mounds marks the flooding of the peritidal platform and the onset of another depositional regime. Consequently, the boundary between the two formations is regarded as a sequence boundary (sequence boundary 9 of the carbonate platform succession; Figs.

The latter are very similar to the mounds in the lower reef horizon. The mounds form small patch reefs, which in places are eroded to form rudstone. Rudstone and grainstone form the matrix for these small reefs. , Beresi, 1986b; section Talacasto east; Fig. 3) and at Cerro La Chilca and include thick-bedded wackestones, packstones, and grainstones. The fauna is dominated by a variety of sponges that seem to have trapped the sediment. Facies associations and depositional environment. A widespread facies association of the San Juan Formation is the wackestone-intraclast packstone association (Fig.

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Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America (Special Paper (Geological Society of America)) by Martin Keller


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