Mens Keychain,Boyfriend Keychain,Men's Keychain,Fossil Keychain,Gifts for Men,Xmas Gifts for Men,Manly Keychain,Keychain for Men,Shell Beautiful authentic Ammonoid fossils rimmed in silver make a perfect gift for someone in your life who loves fossils, nature, or beautiful design. These hang from silver keyclips which make adding a removing keys a breeze. Ammonoid shells are one of my favorite shapes in nature because they so perfectly exemplify the Golden Ratio. Every shell is different and unique but all similar to photos. Ammonoids were squidlike creatures that lived inside an external shell. Ammonoids appeared in the fossil record during the early part of the Devonian Period, about 415 million years ago. They died out about 65 million years ago, during the mass extinction at the end of the Cretaceous Period that killed the dinosaurs and many other kinds of land and sea animals. Fossil is about 1.24 inches by 1.5 inches and total length of keychain from top of keyclip to bottom of fossil is 4.5 inches. Closely related to the Fibonacci Sequence, the Golden Ratio describes the perfectly symmetrical relationship between two proportions and creates a sense of beauty through harmony and proportion. There are numerous examples of the Golden Ratio in nature - you can observe the ratio all around you. Nautilus shells, flowers, Greek architecture, and Renaissance artwork all exhibit the same principle ratio in their make-up. ✦ JOIN ME ON FACEBOOK ➤ www.facebook.com/onetribejewelrydesign ✦ JOIN ME ON PINTEREST ➤ www.pinterest.com/1tribejewelry ✦ JOIN ME ON INSTAGRAM ➤ www.instagram.com/onetribejewelrydesign ✦JOIN ME ON MY WEBSITE➤ www.onetribejewelry.com All my items arrive in a gift box and are shipped within three days via USPS.