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Geological Time Scale with reference to India - 4 Eras & 10 Periods Explained
Structure, Tectonics, and Geological History of the Northeastern Indian Ocean
June , Cite as. The ophiolitic rocks of Naga Hills-Andaman belt occur as rootless slices, gently dipping over the Paleogene flyschoid sediments, the presence of blue-schists in ophiolite melange indicates an involvement of the subduction process. Subduction was initiated prior to mid-Eocene as proved by the contemporaneous lower age limit of ophiolite-derived cover sediment as against the accreted ophiolites and olistostromal trench sediment. During the late Oligocene terminal collision between the Indian and Sino-Burmese blocks, basement slivers from the Sino-Burmese block, accreted ophiolites and trench sediments from the subduction zone were thrust westward as nappe and emplaced over the down-going Indian plate. The geometry of the ophiolites and the presence of a narrow negative gravity anomaly flanking their map extent, run counter to the conventional view that the Naga-Andaman belt marks the location of the suture. The root-zone of the ophiolite nappe representing the suture is marked by a partially-exposed eastern ophiolite belt of the same age and gravity-high zone, passing through central Burma-Sumatra-Java. The ophiolites of the Andaman and Naga Hills are also conventionally linked with the subduction activity, west of Andaman islands.
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The first edition of the official Manual of the Geology of India by Medlicott and Blanford appeared in and a second edition by R. Oldham was published in They were out of print by IglO or thereabouts. Students of geology were, however, fortu- nate in the publication, by Mr. Wadia, of his excellent book 'Geology of India' in I gIg, and the subsequent editions. For about a quarter of a century it has been the only book available on the subject. A new book on Indian Stratigraphy needs therefore no apology to make its appearance, especially at a time when the subject is attracting the attention of an increas- ing number of students and the educated public alike.
Krishnan was born on 24 August in Tanjore , Madras Presidency. After school education in Tanjore, he continued his studies in St. Joseph's College, Trichinapoly. He graduated with B. For two years after receiving his honours degree, Dr.