Bonnie, did you really mean graptolites? I must have missed something very importantr if you did. Clarification??? Ray McAllister, Prof (Emeritus) Ocean Eng., FAU, Boca Raton, FL 33064 Diving Dinosaur, Geologist/Oceanographer/Ocean Engineer, 43 years SCUBA mcallist@gate.net (305) 426-0808, Author Diving Locations, Boynton/Dania