Stromatolitic Microbiota from Black Chert of Cumbum Formation, Upper Cuddapah, Andhra Pradesh

An interesting assemblage of microbiota consisting of filamentous, coccoid and asteroid forms in a stromatolitic black chert sample from Cumbum Formation of Upper Cuddapah sequence, near Zangamarajupalle, Andhra Pradesh is recorded. The microbiota associated with the columnar stromatolite, is dominated by filamentous forms over the coccoids. All the morphotypes reported here from Cumbum Formation are known from the Gunflint chert of Canada dated to be about 1900 to 2000 m years.