New stromatolites from the Upper Precambrian Acungui Group, eastern Parana, Brazil, and their potential stratigraphic use.

Abstract

The small stromatolites described are different from previously reported forms in the Capiru Facies; they are easily identified in the field by their very small size, local abundance, parallel to sub-parallel habit, low frequency of branching, and light color. The fact that essentially identical forms have been found in localities 25 km apart suggests that additional finds may well corroborate their value, postulated here for physical and quite possibly temporal correlation within the Capiru Facies. Further detailed field and laboratory studies should also clarify the paleoecologic and temporal relations between the Capiru Facies and the Itaiacoca Formation. -from Author