| canada | british columbia | synthliboramphus antiquus | species | 1 | 2 |
| japan | aomori prefecture | synthliboramphus antiquus | species | 2 | 0 |
| japan | hokkaido prefecture | synthliboramphus antiquus | species | 41 | 0 |
| japan | iwate prefecture | synthliboramphus antiquus | species | 3 | 0 |
| japan | yamagata prefecture | synthliboramphus antiquus | species | 2 | 0 |
| russia | primorsky krai | synthliboramphus antiquus | species | 1 | 0 |
| united states | alaska | synthliboramphus antiquus | species | 5 | 0 |