| Similarity | Rank | |
|---|---|---|
| Pleistocene | 0.885 | 71860 |
| Cretaceous | 0.810 | 59402 |
| Triassic | 0.793 | 93483 |
| glacial | 0.758 | 30580 |
| Devonian | 0.750 | 99765 |
| geologic | 0.748 | 35099 |
| permafrost | 0.723 | 59965 |
| geological | 0.721 | 19326 |
| Glacial | 0.718 | 92463 |
| climatic | 0.712 | 23497 |
| radiocarbon | 0.710 | 83689 |
| sedimentary | 0.707 | 47805 |
| extinctions | 0.706 | 71406 |
| sea-level | 0.697 | 63584 |
| biota | 0.694 | 95999 |
| crustal | 0.689 | 98623 |
| Permian | 0.688 | 68603 |
| sediments | 0.688 | 31409 |
| tectonic | 0.666 | 44538 |
| seafloor | 0.664 | 63764 |
| Neolithic | 0.663 | 43645 |
| hydrological | 0.661 | 62436 |
| precipitation | 0.658 | 20056 |
| geochemical | 0.655 | 80897 |
| Archaic | 0.653 | 81589 |