Calliphylloceras heterophylloides (Oppel, 1856) from the basalmost jurassic succession of Sadhara Dome, Kachchh, India

Abstract

We record and illustrate a septate (85 mm D) Calliphylloceras heterophylloides (Oppel, 1856) from the basalmost sediments of Sadhara Dome near the eastern end of Goradongar, Patcham 'Island', Kachchh, India. This is the oldest ammonoid-bearing horizon of the exposed Mesozoic sediments in the Kachchh Basin. In view of the correlation of the Late Bajocian Leptosphinctes bed of Kaladongar to the base of bed 32 of our column which is about 164 m younger than the Calliphylloceras-bearing bed 2, the age of present Calliphylloceras-bearing horizon is suggested here as Early Bajocian or older.