A well-preserved Middle to Late Proterozoic microbial assemblage from the Deoban Limestone (Formation), Chakrata region, Garhwal Himalaya, is described from petrographic thin sections of black bedded chert. The present assemblage contains both filamentous and coccoid forms which are mostly of cyanobacterial affinity. The assemblage includes 28 species belonging to sixteen genera and two forms of uncertain affinity described as unnamed forms A and B. Eoentophysalis, Glenobotrydion and Myxococcoides are the three most abundant coccoid forms constituting about 40% of the total coccoid population. The diameter of coccoids ranges between 1.5 and 65 μm. Gunflintia, Biocatenoides and Eomycetopsis are the three dominating filementous genera constituting about 90% of the filamentous population. The width of the filaments ranges between 0.5 and 18 μm. The diversity in coccoids is greater in comparison with filamentous forms. The total assemblage comprises: Coccoid forms— Myxococcoides minor, M. inornata, Eosynechococcus isolatus, Glenobotrydion aenigmatis, G. majorinum, Melasmatosphaera media, M. parva, Tetraphycus major, T. conjunctum, Globophycus rugosum, Huroniospora psilata, H. microreticulata, Caryosphaeroides pristina, Eoentophysalis magna, E. belcherensis, E. cumulus, Gloeodiniopsis gregaria, G. lamellosa, G. sp., Sphaerophycus parvum, unnamed form A and unnamed form B. Filamentous forms— Gunflintia grandis, G. minuta, Biocatenoides sp., Eomycetopsis robusta, E. filiformis, E. siberiensis, Siphonophycus kestron and Oscillatoriopsis sp. The assemblage shows an abundance of small coccoids and thin filaments as compared to larger coccoids and thicker filaments. The abundance of forms decreases with the increase in diameter in coccoid forms and width in filamentous forms.