| Answer | Crossword Clue |
|---|---|
| EON | Span longer than an era |
| EON | It's longer than an era |
| aeons | very large division of geologic time usually longer than an era |
| eons | very large division of geologic time usually longer than an era |
| surbased | (of an arch) having a rise of less than half the span |
| era | large division of geologic time usually shorter than an eon Paleozoic era |
