I will, therefore, take a middle path and propose that the Shivalik landscape was such that only a portion of the Yamunā-Tons ran westward into the M… - Michel Danino

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I will, therefore, take a middle path and propose that the Shivalik landscape was such that only a portion of the Yamunā-Tons ran westward into the Markanda Valley, with the rest flowing southward through a smaller and higher opening than today’s ‘Yamuna tear’. The westward branch was the Sarasvatī (which would explain why the Markanda does not appear in the Rig Veda), while the southward was the Yamunā. When it touched the plains, the Yamunā divided once more, as Cunningham and R.D. Oldham proposed, and others after them: because its terraces occupied a higher level than today, part of the river flowed southwest, joining minor streams to form the Drishadvatī of old. In the plains, the Yamunā was thus a double river—which would conveniently explain the root meaning of the word yamunā: ‘twin’.