The intraformational conglomeratic bands and brown silty-sandstones of the Upper Bhuban unit, Bhuban Formation of western Aizawl, India, have yielded 44 species of bivalves belonging to 26 genera and 17 families. Out of these 44 species, seven species, namely Barbatia sp., Arcopsis sp., Cyclocardia sp., Clinocardium sp., Cultellus sp., Gari (Psammobia) kingi (Noetling), and Corbula (Corbula) mekranica Vredenburg are reported and illustrated for the first time from the Bhuban Formation of Mizoram. The first-five species listed above, however, could not be identified at the specific level for want of better- preserved materials and more detail information. A close study of these fossil assemblages reveals that, the Upper Bhuban unit of Bhuban Formation of western Aizawl has a geological age ranging from Aquitanian to Burdigalian, i.e. Lower Miocene age (20 to 23 million years).