Table 2. Quaternary nannofossil events and their depths at Leg 168 sites.

Preservation stages	Definition
Dissolution
1	No dissolution
2	>50% of specimens slightly etched, all taxa easily identified
3	>50% of specimens moderately etched, >50% taxa readily identified
4	>50% of specimens strongly etched and fragmented, low diversity
5	Almost all specimens strongly etched and fragmented, all species rare
6	Maximum dissolution; barren of coccoliths
Overgrowth
1	No overgrowth
2	>50% of specimens slightly overgrown, all taxa easily identified
3	>50% of specimens moderately overgrown, >50% taxa readily identified
4	>50% of specimens strongly overgrown, low diversity
5	Almost all specimens strongly overgrown, all species rare
6	Maximum overgrowth, limestone, or calcareous debris; barren of identifiable coccoliths