| Period | % Correct |
|---|---|
| Jurassic | 96%
|
| Triassic | 91%
|
| Cambrian | 86%
|
| Cretaceous | 80%
|
| Devonian | 79%
|
| Permian | 73%
|
| Precambrian | 71%
|
| Silurian | 70%
|
| Carboniferous | 69%
|
| Ordovician | 68%
|
| Quaternary | 52%
|
| Tertiary | 47%
|