| Similarity | Rank | |
|---|---|---|
| cretaceous | 0.916 | 15845 |
| permian | 0.903 | 18568 |
| devonian | 0.895 | 17422 |
| ordovician | 0.892 | 22032 |
| silurian | 0.887 | 24411 |
| mesozoic | 0.885 | 21369 |
| palaeozoic | 0.870 | 17635 |
| eocene | 0.869 | 39949 |
| carboniferous | 0.869 | 10443 |
| pleistocene | 0.855 | 19850 |
| precambrian | 0.854 | 28924 |
| namurian | 0.848 | 53188 |
| miocene | 0.846 | 31987 |
| oligocene | 0.839 | 52381 |
| breccia | 0.838 | 37637 |
| alluvium | 0.834 | 48914 |
| proterozoic | 0.826 | 68404 |
| chert | 0.825 | 49404 |
| unconformably | 0.820 | 99989 |
| fossiliferous | 0.819 | 85110 |
| belemnite | 0.816 | 33854 |
| metamorphic | 0.816 | 30217 |
| glaciation | 0.815 | 30769 |
| lacustrine | 0.815 | 76897 |
| andesitic | 0.814 | 76635 |