ESTROMATÓLITOS COLUNARES NA SÉRIE MINAS (MG)

MARCEL AUGUSTE DARDENNE, MÁRIO DA COSTA CAMPOS NETO

Resumo


Columnar algal stromatolites have been discovered in the Precambrian Minas Series, near the city of Cachoeira do Campo (Minas Gerais, Brazil). They appear in dolomite lenses intercalated in phyllites of the Piracicaba Group. These columnar stromatolites present convex laminae and two main types have been recognized: Type A: thin high straight and subcylindroidal columns with ragged lateral surface and "passive" ramification. Type B: irregular tuberous columns with "active" ramification. Shallow quiet waters characterize the environment during the stromatolitic growth.

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