By Martin Keller
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Extra resources for Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America (Special Paper (Geological Society of America))
The sections measured in the limestones of the San Juan Formation and their lithologic correlations are documented in Figure 21. Time frame of deposition. Although detailed paleontologic work on the San Juan Formation began with Kobayashi (1937), there are only a few sections that are biostratigraphically well dated and zoned. There are only isolated data from most sections and they do not allow a precise biostratigraphic correlation to other sections. The first biostratigraphic subdivision of a section of the San Juan Formation dates back to Serpagli (1974), who found five characteristic conodont assemblages (faunas A–E; Fig.
One of the biggest shortcomings of this paper is that there is no mention from which locality the samples were obtained. 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.
In the 35 context of the carbonate ramp (see Appendix 1) model (Aigner, 1985; Read, 1985; Burchette and Wright, 1992), only two facies belts are recognized: the oolite sand bodies of the high-energy barrier zone and back-barrrier, protected lagoonal and peritidal environments. Cañas (1995a, 1995b) considered a rimmed-shelf model (see Appendix 1) the most likely for the deposition of the La Silla Formation with the oolites being margin-related accumulations. This model is attractive in that it explains the presence of deeper water facies as related to a lagoonal environment in back-barrier settings.
Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America (Special Paper (Geological Society of America)) by Martin Keller