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STROMATOLITES OF THE ITAIACOCA GROUP AT SOUTH OF ITAPEVA, SÃO PAULO STATE, BRAZIL. Three columnar stromatolite morphotypes were recognized in the Itaiacoca Group (Proterozoic) to the south of Itapeva, São Paulo. The commonest is assignable to Conophyton on the basis of its coniform lamination and axial zone. The other two forms, with markedly convex but not coniform lamination, differ in size, silhouette and branching. The Indumine and Lavrinhas quarries are outstanding for their abundance and preservation of Conophyton, for their depositional environments and styles of deformation. At both localities, the stromatolites occur in bioherms: tabular and more extensive in the dolostone at Lavrinhas, and lenticular and isolated in the limestone at Indumine. The predominance of Con phyton and the absence of shallow water indicators suggest a deep water environment at both sites. The growth habits of the stromatolites in these two bioherms may be attributed to differences in luminosity and/or relative depth at the two sites. At Lavrinhas, the large column diameters, frequent lateral coalescence and development of the stromatolites, and low siliciclastic content suggest that the water was clear and/or shallow, allowing lateral expansion. At Indumine, the narrow columns, rarity of coalescence, high percentage of siliciclastic impurities in the limestone as well as the great lenticularity of the bioherm point to accentuated vertical heliotropic growth, consistent with deposition in mud or deeper water.

Estromatólitos do Grupo Itaiacoca ao sul de Itapeva, Estado de São Paulo, Brasil