The document summarizes the results of a biostratigraphy study of foraminifera and paleoenvironments in the Maibong-Jagdi area, North Cachar Hills, Assam, India from the Late Oligocene to Early Miocene. Key findings include: 1. Foraminifera found in the Renji Formation indicate a Late Oligocene age and shallow marine paleoenvironment. 2. Foraminifera found in the Lower Bhuban Formation, including planktonic and benthic species, indicate an Early Miocene age and near-shore turbulent paleoenvironment. 3. Foraminifera found in the Middle Bhuban Formation, including Trochammina nippon