Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A ...

• Main Authors: Kamikuri, Shin-Ichi, Wade, Bridget S
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Drilling/drill rig; Leg171B; Joides Resolution; Ocean Drilling Program ODP; Pacific; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.811220; https://doi.pangaea.de/10.1594/PANGAEA.811220

Quantitative radiolarian assemblage analysis has been conducted on middle and upper Eocene sediments (Zones RP16 to RP18) from Ocean Drilling Program Site 1052 in order to establish the radiolarian magnetobiochronology and determine the nature of the faunal turnover across the middle/late Eocene boundary in the western North Atlantic Ocean. We recognize and calibrate forty-five radiolarian bioevents to the magneto- and cyclo-stratigraphy from Site 1052 to enhance the biochronologic resolution for the middle and late Eocene. Our data is compared to sites in the equatorial Pacific (Leg 199) to access the diachrony of biostratigraphic events. Eleven bioevents are good biostratigraphic markers for tropical/subtropical locations (south of 30°N). The primary markers (lowest occurrences of Cryptocarpium azyx and Calocyclas bandyca) which are tropical zonal boundary markers for Zones RP17 and RP18 provide robust biohorizons for correlation and age determination from the low to middle latitudes and between the ... : Supplement to: Kamikuri, Shin-Ichi; Wade, Bridget S (2012): Radiolarian magnetobiochronology and faunal turnover across the middle/late Eocene boundary at Ocean Drilling Program Site 1052 in the western North Atlantic Ocean. Marine Micropaleontology, 88-89, 41-53 ...