550 million years old!!

Two by 1 inch 550 million year old fossil embedded in a rock fully packed with other fossils weighing approx. 5 lbs. The dimension is ~6"x8"x2". This is a form of invertebrate marine life that lived more than 550 million years ago, but are now extinct. These hard-shelled prehistoric critters roamed the sea floor and coral reefs in search of food. Because of their great diversity and often perfect preservation in fine-grained rock, they are one of the most popular fossils among collectors.