| A | B |
|---|
| 510 - 440 million years ago | Ordovician |
| A nonflowering plant related to conifers | Cycad |
| The only living species of the gingko | maidenhair tree |
| Gondwanaland Africa, Australia and | Antarctica and South America |
| Gastroliths are stones | found in the stomachs of some dinosaurs |
| Hadrosaur | duck-bill dinosaur |
| 410 - 610 million years ago | Devonian |
| large herbivore with pointed horns | and a bony frill - Ceratopsian |
| Cast fossil contains | the shape of a buried animal |
| Laurasia | North America, Europe, Asia |
| Carboniferous Period | 360-290 million years ago |
| A dolphinlike reptile | ichthyosaur |
| A reptile skull with two openings | diapsid |
| Cycad is a nonflowering plant | related to today's conifers |
| Mesozoic Era | 250- 65 million years ago |
