The answer to the crossword clue "Geological period" can be a 3-letter word, 4-letter word, or 8-letter word.
3-letter words: EON, ERA
4-letter word: AEON
8-letter words: PLIOCENE, CAMBRIAN, SILURIAN
The 3-letter words are the most general terms for a geological period, while the 4-letter word and 8-letter words are more specific terms for particular geological periods.
Here is a table of the different geological periods and their corresponding lengths:
| Period | Length (millions of years) |
|---|---|
| Hadean | 4.5 billion - 4 billion |
| Archean | 4 billion - 2.5 billion |
| Proterozoic | 2.5 billion - 541 million |
| Paleozoic | 541 million - 252 million |
| Mesozoic | 252 million - 66 million |
| Cenozoic | 66 million - present |
I hope this helps!
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