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The arid zone of Rajasthan has a humid past. The present communication records provide evidence of paleo-humidity from the Ajmer district in Rajasthan manifested as channel conglomerates and karat development in the marble rocks within the arid landscape, which suggests that a humid phase existed in the Luni Basin during the Quaternary period in Rajasthan. The present find of Quaternary signatures of paleo-humidity suggests that the humid phase in the Thar Desert extended beyond the Saraswati drainage basin up to the Luni basin, covering the entire Trans-Aravalli region. (C) 2000 Academic Press.