| Similarity | Rank | |
|---|---|---|
| Cretaceous | 0.969 | 59402 |
| Devonian | 0.932 | 99765 |
| Pleistocene | 0.893 | 71860 |
| Permian | 0.834 | 68603 |
| Holocene | 0.793 | 86928 |
| sedimentary | 0.782 | 47805 |
| Cambrian | 0.781 | 62691 |
| Jurassic | 0.767 | 32117 |
| fossils | 0.765 | 23150 |
| shales | 0.749 | 97010 |
| metamorphic | 0.745 | 76409 |
| erectus | 0.736 | 90493 |
| calcareous | 0.732 | 93129 |
| Neolithic | 0.731 | 43645 |
| hominids | 0.727 | 99822 |
| Fossils | 0.723 | 91035 |
| outcrops | 0.722 | 57445 |
| hominid | 0.717 | 82094 |
| prehistoric | 0.712 | 22958 |
| sediments | 0.712 | 31409 |
| outcrop | 0.711 | 58409 |
| geologic | 0.705 | 35099 |
| extinctions | 0.700 | 71406 |
| mammoths | 0.698 | 92970 |
| geological | 0.698 | 19326 |