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| ammonite1 |
any of various coiled, flat, chambered fossil shells of extinct cephalopod mollusks from the Mesozoic era. |
| cretaceous |
(cap.) of, relating to, or designating the geological period at the end of the Mesozoic Era, from approximately 135 million to 65 million years ago, when dinosaurs died out, early mammals and flowering plants appeared, and chalk beds were formed. [1/2 definitions] |
| Jurassic |
of, relating to, or designating the geological period between the Triassic and Cretaceous of the Mesozoic Era, from approximately 180 million to 135 million years ago, when primitive birds appeared and conifers were prominent. [1/2 definitions] |
| Mesozoic |
the Mesozoic Era, or the rock formations that date from that time. [1/2 definitions] |
| Paleozoic |
of, relating to, or designating the geological era between the Precambrian and Mesozoic, from approximately 600 million to 220 million years ago, when the first fishes, amphibians, reptiles, insects, and land plants appeared. [1/2 definitions] |
| plesiosaur |
an extinct marine reptile of the Mesozoic era having paddle-like limbs, a large flat body, and a short tail. |
| pterosaur |
a flying reptile of the Mesozoic era characterized as having a birdlike beak and membranous wings supported by an exceptionally long fourth digit of each forelimb. |
| Triassic |
of, relating to, or designating the first geological period of the Mesozoic Era, from approximately 220 million to 180 million years ago, when volcanic activity was prominent and many reptiles, including the dinosaurs, appeared. [1/2 definitions] |
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