WFS: Ariyalur Fossils ( Arctostrea ):   This upper Cretaceous oyster is characterized by long and curved valves. Stout ribs cross the upper valve. The sample is obtained from Ariyalur/Dalmiapuram area. samples collected by Riffin T Sajeev and Russel T Sajeev from World Fossil society. The Rastellum genus of oysters lived between 161 to 65 million […]