Geologists believe that a mighty Indo-Brahma River traversed the entire longitudinal extent of the Himalayas from Assam to Punjab and onwards to Sind, and finally discharged into the Gulf of Sind near lower Punjab during which period?

The correct answer is Miocene . Key Points The Miocene epoch lasted approximately from 23 million to 5.3 million years ago and is part of the Neogene period. During the Miocene epoch, significant geological and climatic changes occurred, including the upliftment of the Himalayan range due to tectonic activity. Geologists believe the mighty Indo-Brahma River traversed the entire longitudinal extent of the Himalayas from Assam to Punjab and beyond during the Miocene period. The Indo-Brahma River contributed to sediment deposition in various regions, which later formed part of the Indo-Gangetic plain. Studies of sedimentary deposits and paleogeographic reconstructions provide evidence of the existence of this river system during the Miocene epoch. Additional Information Jurassic Period: The Jurassic period occurred approximately 201 to 145 million years ago, falling within the Mesozoic era. It is known for the dominance of dinosaurs and the diversification of marine life. The period saw the breakup of the supercontinent Pangaea and the formation of new ocean basins. It does not correspond to the timeline of the Indo-Brahma River formation, as the Himalayas were not fully formed during this period. Holocene Epoch: The Holocene epoch began approximately 11,700 years ago and extends to the present day. It marks the time of significant human development, including the rise of agriculture, civilizations, and modern societies. While river systems like the Ganges evolved during this epoch, the Indo-Brahma River existed much earlier, during the Miocene period. Pliocene Epoch: The Pliocene epoch lasted from about 5.3 million to 2.6 million years ago and is part of the Neogene period. This epoch was characterized by climatic cooling and the spread of grasslands, influencing mammalian evolution. Although the Himalayas continued to evolve during this period, the Indo-Brahma River had already existed earlier during the Miocene epoch. Main Theme - Indo-Brahma River System: The Indo-Brahma River was a massive fluvial system believed to have traversed the Himalayan region during the Miocene epoch. Its existence is inferred from geological studies, sediment deposits, and paleogeographic reconstructions. This river played a crucial role in shaping the landscape and sedimentary formations in the northern Indian subcontinent.