| Similarity | Rank | |
|---|---|---|
| triassic | 0.916 | 19513 |
| permian | 0.910 | 18568 |
| silurian | 0.898 | 24411 |
| devonian | 0.892 | 17422 |
| eocene | 0.889 | 39949 |
| mesozoic | 0.880 | 21369 |
| ordovician | 0.877 | 22032 |
| miocene | 0.866 | 31987 |
| pleistocene | 0.852 | 19850 |
| carboniferous | 0.849 | 10443 |
| precambrian | 0.846 | 28924 |
| palaeozoic | 0.846 | 17635 |
| oligocene | 0.840 | 52381 |
| facies | 0.825 | 23456 |
| metamorphic | 0.823 | 30217 |
| namurian | 0.819 | 53188 |
| archaean | 0.815 | 68387 |
| glaciation | 0.811 | 30769 |
| unconformably | 0.810 | 99989 |
| proterozoic | 0.809 | 68404 |
| gneiss | 0.807 | 38681 |
| breccia | 0.806 | 37637 |
| grainstone | 0.801 | 43255 |
| chert | 0.799 | 49404 |
| lias | 0.795 | 55567 |