Each one of these little dots is a lens. And each is made from calcite, a crystalline form of chalk. Trilobites were the only organisms ever really to use this stuff as their lens material. And in doing so, they evolved very sophisticated vision indeed. For example, these sorts of trilobites had very large lenses. And each lens is readily visible with the naked eye and each one is biconvex. And its proven that each individual lens had little bowls inside them to help them focus more clearly. holy shit.
Posted on: Fri, 19 Sep 2014 20:40:41 +0000