The nannofossil assemblages of Deep Sea Drilling Project Leg 66, Middle America Trench ( DSDP).

Abstract

Late Tertiary and Quaternary sediments were recovered in the deep sea drillings of Leg 66 at eight sites along two transects across the Middle America Trench. More than 1500 calcareous nannofossil samples were collected. One of the objectives was the determination of geologic age by means of nannofossil biostratigraphy; another was to collect data on the history of the trench sediments and on the amount of reworking along the active margin off southern Mexico. Reworking was shown to have occurred only within the late Tertiary and Quaternary sediments, with no evidence of older nannofossils being involved in sediment transport. -from Authors