The present research is emphasized on the some lithostratigraphic and nannoplankon biostratigraphic evidences between Paleogene and Neogene. The present study area is situated in the Minbu Township, Magwe Region. It lies in the north latitude (20°02´45"to 20°06´50"N ) and east longitude (94°35´20" to 94°40´05"E) fall in the topomap no.84 L/12.The Paleogene/Neogene demarcation lies between the top of lower Pegu Group (Okhmintaung Formation) and the base of upper Pegu Group (Pyawbwe Formation). There is distinct erosional surface (disconformity) at top the top of Okhmintaung Formation (Paleogene). So the lithostratigraphic evidence between Paleogene and Neogene boundary is unconformable in the study area. Some index nannofossils such as Sphenolithus conicus, S. belemnos?, S.dissimilis, S. moriformis , Helicosphera truempyi, H. ampliapeta, H. obliqua, H.euphratis, H,cateri, Discoasterdeflandrei, D.druggii, Cyclicargolithus abisectus,Cy. floridanus, Ponsphaera multipora and Coccolithus pelagicus, etc. are observed in the present study area. But, the index zone NP 25 representative species Sphenolithus ciperonsis has not been observed in the study area.

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