An Overview of Fossil Molluscs from the Miocene Sedimentary Rocks of Kachchh

The oldest record of the bivalve Dosinisca Dall and its implications

“…A revision of the fossil molluscs from the Miocene rocks of Kachchh by the present authors (Borkar et al 2004(Borkar et al , 2012(Borkar et al , 2014(Borkar et al , 2016Kulkarni et al 2009Kulkarni et al , 2010Harzhauser et al 2009) has strengthened the affinities between Miocene molluscan assemblages of Barrow Island and Kachchh by identifying 10 related elements (table 2). The present authors have also attempted to find evidence of affinity between the Miocene fauna of the Barrow Island and fauna of Miocene rock formations of the East Indies (table 3).…”

“…On the basis of foraminfera, Raju (1974) has assigned an Aquitanian age to the Khari Nadi Formation, while a Burdigalian age for the Chhasra Formation. The present authors have revised the molluscan fauna (Borkar et al 2004, 2012, 2014, Kulkarni et al 2009, 2010 and have given a checklist of 123 species (47 bivalves and 79 gastropods) (Borkar et al 2016). The fauna is mostly endemic; however, certain species typical of a Lower Miocene age predominate the assemblage.…”

“…On the basis of the relationship of this fauna with that of Sindh, Kathiawar, Kerala and Sri Lanka, it was inferred that they constitute a palaeozoogeographic province which Borkar et al (2016) have designated as the Kachchh Burdigalian Palaeozoogeographic Province.…”

“…gave a remarkable account of the fossil molluscs from the Oligocene, Miocene and Pliocene rock formations exposed in the Kachchh and Kathiawar regions of India as well as the Sindh and Balochistan states of Pakistan. While revising the fossil molluscs from the Miocene rock formations of Kachchh (Borkar et al 2004(Borkar et al , 2012(Borkar et al , 2014(Borkar et al , 2016Kulkarni et al 2009Kulkarni et al , 2010, the present authors had an opportunity to examine the type specimens of Dosinia described by Vredenburg, housed in the Central Fossil Repository of the Geological Survey of India (GSI), Kolkata. Furthermore, a few fossil specimens, closely comparable to those described by Vredenburg as Dosinia, were collected lately from the Miocene rocks of Kachchh by one of us (VDB).…”

“…Emerging findings are enunciated in the present communication. Some preliminary remarks about it were made earlier (Borkar et al 2016).…”