| Questions | Answers |
|---|---|
| The Ordovician were... | Celtic tribes |
| Ancient gastropods, relatives of today's snail, were | Malcurites |
| The word "pelecypod" means | hatchet-foot |
| The conical shell of primitive cephalopods contained | stony deposits |
| Ancient crinoids were | stalked echinoderms |
| Bonus question: The Silurian Period is named after an ancient tribe of | Celts |