Uniqueness Guaranteed: Every item is one-of-a-kind, making them ideal for all projects or designs. Listing is for (1 piece) Avg Size Range: (7 inches) Orthoceras fossils are formed through the gradual replacement of the original organic material by minerals, such as calcite or silica, during the fossilization process, preserving the shell-like structures of ancient cephalopods. Custom Requests: Have specific preferences? Leave a message with your order, and we'll do our best to accommodate your requests if possible. Handmade items vary in size, shape, and color when selected randomly (the highest quality items are chosen first). They'll be as beautiful as those in the photos.