| Similarity | Rank | |
|---|---|---|
| ordovician | 0.914 | 22032 |
| triassic | 0.895 | 19513 |
| silurian | 0.893 | 24411 |
| cretaceous | 0.892 | 15845 |
| permian | 0.882 | 18568 |
| eocene | 0.878 | 39949 |
| mesozoic | 0.873 | 21369 |
| palaeozoic | 0.870 | 17635 |
| precambrian | 0.855 | 28924 |
| carboniferous | 0.854 | 10443 |
| unconformably | 0.849 | 99989 |
| facies | 0.844 | 23456 |
| metamorphic | 0.837 | 30217 |
| pleistocene | 0.836 | 19850 |
| dinantian | 0.834 | 48032 |
| oligocene | 0.834 | 52381 |
| namurian | 0.833 | 53188 |
| chert | 0.832 | 49404 |
| archaean | 0.832 | 68387 |
| dalradian | 0.832 | 31062 |
| miocene | 0.831 | 31987 |
| breccia | 0.828 | 37637 |
| lias | 0.827 | 55567 |
| proterozoic | 0.825 | 68404 |
| gneiss | 0.825 | 38681 |