Early to early Miocene radiolarian biostratigraphy for the low-latitude Pacific Ocean

Author(s): Kamikuri, Shin-ichi; Moore, Theodore C.; Ogane, Kaoru; Suzuki, Noritoshi; Palike, Heiko; Nishi, Hiroshi
Author Affiliation(s): Primary:
Ibaraki University, Faculty of Education, Ibaraki, Japan
University of Michigan, United States
National Museum of Nature and Science, Japan
Tohoku University, Japan
National Oceanography Centre, United Kingdom
Volume Title: Stratigraphy
Source: Stratigraphy, 9(1), p.77-108. Publisher: Micropaleontology Press, New York, NY, United States. ISSN: 1547-139X
Note: In English. 81 refs.; illus., incl. strat. cols., 3 plates, 1 table, sketch map
Summary: A total of 226 early Eocene to early Miocene radiolarian datum events are identified and correlated with the geochronologic time scale at Sites U1331, U1332, and U1333 in the equatorial Pacific Ocean. Seven new radiolarian subzones are proposed for the low-latitude Oligocene: Eucyrtidium diaphanes Interval Subzone (RP22b); Calocycletta (Calocycletta) robusta Interval Subzone (RP22a); Lychnocanoma apodora Interval Subzone (RP21b); Theocyrtis annosa Interval Subzone (RP21a); Eucyrtidium plesiodiaphanes Interval Subzone (RP20c); Dorcadospyris pseudopapilio Interval Subzone (RP20b); Lithocyclia angusta Interval Subzone (RP20a). These subzones significantly improve the biostratigraphic resolution within the Oligocene (an average of one subzone per 1.6 million years [my]). Our study corroborates previous studies, which inferred that primary Oligocene datums were synchronous in the low-latitude Pacific. Four Eocene zones, Cryptocarpium ornatum (RP19), Calocyclas bandyca (RP18), Phormocyrtis striata striata (RP9), and Buryella clinata (RP8) are emended. Two new species/subspecies, Lychnocanoma klausi and Theocorys anaclasta clasta, are described.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Biostratigraphy; Biozones; Cenozoic; East Pacific; Eocene; Expedition 320; Expeditions 320/321; Faunal list; IODP Site U1331; IODP Site U1332; IODP Site U1333; Integrated Ocean Drilling Program; Invertebrata; Lithostratigraphy; Lower Miocene; Lychnocanoma klausi; Microfossils; Miocene; Morphology; Neogene; New taxa; North Pacific; Northeast Pacific; Oligocene; Pacific Ocean; Paleogene; Protista; Radiolaria; Taxonomy; Tertiary; Theocorys anaclasta clasta
Coordinates: N103105 N120405 W1382510 W1420942
Record ID: 2013020744
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.