| Rating | Solver | Clue |
|---|---|---|
| ICEAGE | Glacial period | |
| ICE AGE | Glacial period (3,3) | |
| AGE | Glacial period, ice ... | |
| PREGLACIAL | Prior to the glacial or drift period. | |
| PERIOD | One of the great divisions of geological time; as, the Tertiary period; the Glacial period. See the Chart of Geology. | |
| CHAMPLAIN PERIOD | A subdivision of the Quaternary age immediately following the Glacial period; -- so named from beds near Lake Champlain. | |