This study presents results of integrated larger foraminiferal biostratigraphy, lithofacies and stable carbon isotope (13 C org) analysis carried out in the Sylhet Limestone of Dillai Parbat Limestone Mine succession, Karbi Anglong District, Assam. Larger foraminiferal assemblages assign a middle Eocene age to the studied succession of Sylhet Limestone. The Shallow Benthic Zone (SBZ) 13 and SBZ 16-18 and a barren interval in between is recognized in the studied part of the Sylhet Limestone. The SBZ 13 Zone (early Lutetian) is represented by fossiliferous limestone at the base of the section and is inferred to have been deposited in a subtidal environment. The overlying barren interval lies in the arenaceous interval and was likely deposited in a subtidal channel sand shoaling bars. The upper part of the section ismarked by SBZ16-18 (late Lutetian to Bartonian) and was deposited in subtidal channel sand inner neritic zone environments, followed by intertidal marl to subtidal limestone. The organic carbon stable isotopic data reveals a sharp negative excursion at about 34-35m of the succession, which may be correlated with Middle Eocene Climatic Optimum (MECO) and/or vegetation types. This and earlier studies from India and elsewhere indicate that during the middle Eocene, the Neo-Tethys Sea was open and connected through the East and West coasts of India, Northeast India, western Himalaya, and most of the Middle East and southeast Europe. This vast area produced enormous amount of petroleum.

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The fossiliferous middle Eocene deposits of Sylhet Limestone of Mikir Hills have yielded vertebrate and invertebrate faunas. The fossil assemblages recorded in this contribution consist of shark, ray, crocodile, conical tooth, broken fragments and echinoderm spines. Ray and crocodile tooth are reporting for the first time from the Mikir Hills. Paleoenvironmental analysis based on the fossil fish assemblage in association with invertebrate (foraminifera) remains and sedimentogical observations suggest a shallow marine environment ranging from open marine, inner neritic to more proximal coastal settings. Also, the presence of common marine elements (similar faunas) from Kutch,

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The news that Dr. D.S.N Raju, former Deputy General Manager (DGM) of Oil and Natural Gas Commission (ONGC), Dehradun, a renowned micropaleontologist and biostratigrapher left for heavenly abode on 11 th May 2021, was a shock to one and all who knew him. A great teacher, scholar and a passionate geologist, Dr. D.S.N. Raju died at his Rajahmundry residence after a brief illness. He was a kind hearted and wonderful person with never-ending curiosity for geological studies. With his dedication and hard work, he determined to leave his legacy summarized in books, charts and papers to the next generations and he succeeded in this to a large extent. Till the time he could move around, he was collaborating with Professors and Scientists across the globe at his personal lab working tirelessly on Lexicon (INDPLEX) for the geological formations on Indian sedimentary basins. He was addicted to micropaleontology till his last breath. His contributions in geological studies will continue to guide hydrocarbon exploration in the Indian basins for a long time to come.Born on 01.07.1938 at Yelurupadu in West Godavari district, Andhra Pradesh, he was the second son of Lt. Mr. Datla Venkatanarasimha Raju and Lt. Mrs. Datla Buchirajaiah. Dr. D.S.N. Raju had his earlier education at Yelurupadu and topped the SSLC exam and intermediate in the DNR College at Bhimavaram. He desired to study philosophy and secured a seat in Santiniketan (Kolkata). However, as destiny would determine, his family members weighed in and changed his mind on the verge of boarding the train to Howrah at the Tadepalligudem railway station. Then, he applied for B.Sc. (Hons.