Table 2 Number of echinoid genera and higher taxa relative to the number of collections found in each time interval
Time interval | Number of occurrences | Number of genera and higher taxa |
|---|---|---|
Neogene undifferentiated | 18 | 13 |
Eocene | 5 | 3 |
Oligocene | 10 | 7 |
Miocene | 278 | 83 |
Pliocene | 114 | 35 |
Pleistocene | 15 | 13 |