carbonate platform Argentina 12 paleoenvironment 8 Gondwana 6 Neuquen Basin 6 Neuquén Basin 6 Ordovician 6 Anthozoa 4 Brazil, San Juan 4 Cambrian 4 Mendoza 4 Oxfordian 4 South America 4 carbonate ramp 4 coral reef 4 depositional environment 4 facies 4 facies distribution 4 lithostratigraphy 4 palaeoenvironment 4 remagnetization 4 stromatolite 4 thrombolite 4 Acetabularia 2 Ammonoidea 2 Argentina, Precordillera 2 Ash fall 2 Basement rocks 2 Bivalvia 2 Bryozoa 2