Composition of Ordovician Algoflora of Argentine Precordillera and Its Significance for the Formation of Organic Structures

The Argentine Precordillera, which was part of Gondwana in the Ordovician, is characterized by complex geological evolution, which is reflected in a series of bioevents evident from paleontological data (trilobites, conodonts, brachiopods, graptolites, etc.). An important role also belonged to calcareous algoflora as a major constituent of reefs, which is the main focus of the paper. Some calcareous algae are revised.