Crinoids: Living Fossils of the Sea (PA-09)
When crinoids die, the skeleton plates tend to fall apart, so complete crinoid heads are highly prized. Many Indiana limestones contain many crinoid stems and plates, locally called Indian beads. Fossil crinoids were discovered an long before living ones were noticed. These animals are still important marine life, especiallly near the coral reefs and in the deep sea, but they are not nearly so common as they once were.
Our Hoosier State Beneath Us: Paleontology