Crinoid stem fragments collected from Tafilalet, Alnif in Southern Morocco. Crinoids are an ancient marine fossil group, often referred to as ' sea lilies ' because of their resemblance to plants or flowers. These specimens date back to the Silurian Period, that's an incredible 420 million years ago. Crinoids were anchored to the sea bed by means of their holdfast and they used their branching arms to trap food particles. Today crinoids still exist however they slightly differ in appearance to their prehistoric ancestors. These crinoid stem clusters exhibit the branching nature of these ancient sea lilies and they are supplied with a plastic hand lens to enhance the viewing of the specimen. Each specimen is supplied in a tightly sealed blister pack with a detailed information label; an ideal gift for children, beginner geologists and collectors.