Figure F5. Stratigraphic summary for 130–80 Ma. Biostratigraphy after Bralower, Premoli Silva, Malone, et al. (2002), Bown (this volume), and Lees and Bown (this volume). Condensed pattern annotates intervals in which some biozones could not be identified with certainty and/or may comprise short hiatuses or unconformities. Note that in the Cretaceous sections older than Campanian the recovery was very poor due to diffuse chert layers alternating with softer chalk. OAE = Ocean Anoxic Event, TD = total depth.

Figure F5. Stratigraphic summary for 130–80 Ma. Biostratigraphy after Bralower, Premoli Silva, Malone, et al. (2002), Bown (this volume), and Lees and Bown (this volume). Condensed pattern annotates intervals in which some biozones could not be identified with certainty and/or may comprise short hiatuses or unconformities. Note that in the Cretaceous sections older than Campanian the recovery was very poor due to diffuse chert layers alternating with softer chalk. OAE = Ocean Anoxic Event, TD = total depth.