| Similarity | Rank | |
|---|---|---|
| ordovician | 0.900 | 22032 |
| metamorphic | 0.883 | 30217 |
| proterozoic | 0.881 | 68404 |
| permian | 0.880 | 18568 |
| lewisian | 0.879 | 43492 |
| metasedimentary | 0.879 | 73812 |
| gneiss | 0.875 | 38681 |
| palaeozoic | 0.874 | 17635 |
| mesozoic | 0.871 | 21369 |
| chert | 0.870 | 49404 |
| silurian | 0.865 | 24411 |
| eocene | 0.864 | 39949 |
| dalradian | 0.858 | 31062 |
| archaean | 0.858 | 68387 |
| greywacke | 0.856 | 72592 |
| devonian | 0.855 | 17422 |
| triassic | 0.854 | 19513 |
| unconformably | 0.850 | 99989 |
| dinantian | 0.850 | 48032 |
| igneous | 0.847 | 20899 |
| cretaceous | 0.846 | 15845 |
| miocene | 0.846 | 31987 |
| pleistocene | 0.842 | 19850 |
| sedimentary | 0.840 | 16591 |
| namurian | 0.838 | 53188 |