Changes

* Ratios or percentages of in situ vs. reworked calcareous nannofossil or palynomorph species

* Ratios or percentages of in situ vs. reworked calcareous nannofossil or palynomorph species

An example of the first type is the thin interval in the Lower Pliocene characterized by high abundances of the planktonic foraminiferal genus ''Sphaeroidinellopsis'' spp., which represents a set of paleoceanographic conditions that can be correlated in many areas of the Mediterranean.<ref name=ch17r24>Cita, M., B., 1975, The Miocene/Pliocene boundary: history and definition, in Saito, T., Burckle, L., H., eds., Late Neogene Epoch Boundaries: New York, Micropaleontology Press Special Publication 1, p. 1–30.</ref><ref name=ch17r47>Iaccarino, S., 1985, Mediterranean Miocene and Pliocene planktic foraminifera, in Bolli, H., M., Saunders, J., B., Perch-Nielsen, K., eds., Plankton Stratigraphy: Cambridge, Cambridge University Press, p. 283–314.</ref>

An example of the first type is the thin interval in the Lower Pliocene characterized by high abundances of the planktonic foraminiferal genus ''Sphaeroidinellopsis'' spp., which represents a set of paleoceanographic conditions that can be correlated in many areas of the Mediterranean.<ref name=ch17r24>Cita, M. B., 1975, The Miocene/Pliocene boundary: history and definition, in T. Saito, and L. H. Burckle, eds., Late Neogene Epoch Boundaries: New York, Micropaleontology Press Special Publication 1, p. 1–30.</ref><ref name=ch17r47>Iaccarino, S., 1985, Mediterranean Miocene and Pliocene planktic foraminifera, in H. M. Bolli, J. B. Saunders, and K. Perch-Nielsen, eds., Plankton Stratigraphy: Cambridge, Cambridge University Press, p. 283–314.</ref>

Assemblage data can also help us recognize diagnostic elements of stratigraphic sequences.

Assemblage data can also help us recognize diagnostic elements of stratigraphic sequences.