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))
5. 5: Microbial laminite. In places, well-preserved Girvanella (arrow) are observed that encrust microbial layers. 5. 6: Wackestone with sponge-fragment (arrows) is overlain by thin intraclast layer. Entire sediment is strongly biomottled. 5. org on September 24, 2011 34 M. Keller Fragments of trilobites and gastropods as well as peloids served as nuclei for the radially concentric ooids. Grapestones or coated grains are also present. In many oolite beds almost all ooids are diagenetically altered to microquartz or chalcedony.
A detailed description of these facies was given by Cañas and Carrera (1993). Large isolated bioherms are present in the upper reef interval (2 in Fig. 23). They consist of a solid framework of stromatoporoids (Keller and Flügel, 1996). Some of these framestones still contain internal wackestone with abundant algae and brachiopods. The mounds are onlapped by pelmatozoan grainstone. Some of the mounds are covered with packstones in which gastropods (Maclurites) and nautiloids are concentrated. Thick biostromes are also observed in the upper reef interval.
17). Biostratigraphic data in this part of the La Silla Formation are very sparse and do not allow the recognition of a possible hiatus, so the breccia bed and the accumulation of mudcracks at this surface are the only arguments to consider the sequence boundary a type 1 boundary. From a regional perspective, it is much more likely that the sequence boundary (sequence boundary 11 of the carbonate platform succession; Fig. 20) represents a type 2 boundary, because there is no well-defined basinward shift in facies or areally exposure or karstification.