WR starfish crinoid slab Published October 8, 2020 - size: 2016 × 1512 in WR starfish crinoid slab ← Previous Next → Figure 1. Unidentified starfish (7/8 inch across) and crinoid (1 1/4 inches long), Ordovician, Rust Formation, Russia, New York. Prepared by Ben Cooper. Read More