ECHINODERMS 1: CRINOIDS
The abundance of crinoids in Paleozoic seas is almost incredible. Many thick beds of limestone are composed almost entirely of crinoid remains. If you look closely you will see many tiny crinoid columnals in the Kaibab. The crinoid animal is called a sea lily. It has a flower-like crown and a long stem or column consisting of many columnals like the one shown below. The skeleton tends to fall apart after death.
