Table 1 Classification scheme of the bioturbation index (BI) (modified from Taylor and Goldring 1993)
BI | Percentage of the disturbed sediment (%) | Description |
|---|---|---|
0 | 0 | No bioturbation |
1 | 1–5 | Sparse bioturbation, few biogenic structures visible |
2 | 6–30 | Low bioturbation, well-preserved sedimentary fabric |
3 | 31–60 | Moderate bioturbation, well-preserved sedimentary fabric |
4 | 61–90 | Intense bioturbation, high trace fossil density, with overlap of trace fossils |
5 | 91–99 | Intense bioturbation, completely disturbed sediment |
6 | 100 | Complete bioturbation, with sediment fully reworked |