Enping Vishnugupta intertestamental Dadiwan literature epigraphic Eomaia asomtavruli Atuatuca tripadi Dendra sira Bhattiprolu Assenede Brahmi Lepontic perico extant Tenerians Hylonomus Pathinenmaelkanakku Westlothiana Ostromir Sivakami Cooksonia Muratorian Elbaue inscriptions Dubacan Sangam Tolkappiyam eutherian bangla barabensis sheadings DQbqmt Heideland datable