Epistrenoceras Bentz (Ammonoidea) from the Middle Jurassic of Kutch (western India): a new record and its chronostratigraphic implication

The identification of late Bathonian beds and the position of the boundary between the Bathonian and Callovian in Kutch, western India, continued to b e elusive until recently. The dominant ammonite faunas show strong endemism and thus are of little value in worldwide age correlations. The present pa per records Epistrenoceras Bentz from the Patcham Formation of Jumara, whic h is regarded as a biological stopwatch indicating only the upper Bathonian . This find, together with other recently recorded time-diagnostic forms, n ow resolves the uncertainties.