Abstract
Vredenburg observed that faunas of 'Lower Gaj Beds' and 'Upper Gaj Beds' of both Sindh (Pakistan) and Kachchh (India) do not differ sufficiently, yet are distinct. They correspond respectively to Rembang (Aquitanian) and Nyalingdung Series (Burdigalian) of Indonesian Archipelago. However, fresh collections from the Miocene formations of Kachchh evince a lucid distinction between faunas of these two divisions, now known as Khari Nadi and Chhasra Formations. The faunal elements have close affinities with those from Miocene deposits of adjoining Sindh and Kathiawar regions. The Kachchh Miocene molluscan assemblage is decidedly endemic. Also, 52.38% of Kachchh molluscs do not occur outside Burdigalian rock formations of Sindh, Kachchh, Kathiawar, Kerala and Sri Lanka; implying strongly that they together constitute a palaeozoogeographic province. It is proposed here to designate this province as the 'Kachchh Burdigalian Province'. Affinities between the faunas of Barrow Island off the northwestern coast of Australia and the Kachchh Burdigalian Province incite a probable migratory route from Kachchh to Barrow Island through Indonesia and Timor during Burdigalian. Paucity of the Tethyan elements in the Lower Miocene molluscan fauna of Kachchh, vis-a-vis that during Oligocene substantiates the observation that the Sindh Sea was cut off from the Western Tethys during Aquitanian.
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