Biomagnetochronology of middle Eocene planktonic Foraminifera

Author(s): Hilding-Kronforst, Shari; Wade, Bridget S.
Author Affiliation(s): Primary:
Texas A&M University, Department of Geology and Geophysics, College Station, TX, United States
Other:
University of Leeds, United Kingdom
Volume Title: Geological Society of America, 2012 annual meeting
Source: Abstracts with Programs - Geological Society of America, 44(7), p.217; Geological Society of America, 2012 annual meeting, Charlotte, NC, Nov. 4-7, 2012. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: Planktonic foraminiferal biostratigraphy provides an important tool for constraining the timing of dynamic changes through the middle Eocene. We examine planktonic foraminiferal assemblages from Ocean Drilling Project (ODP) Leg 171B, Site 1051, Blake Nose in the western North Atlantic Ocean. Planktonic foraminifera are abundant, with diverse assemblages. Quantitative biostratigraphy was conducted on planktonic foraminifera from 119 to 369 meters below sea floor in Hole 1051A. This interval corresponds to magnetochrons C21n to C18r. All planktonic foraminifera are well preserved (although recrystallized), and assemblages are diverse with common Acarinina, Globigerinatheka, Subbotina, and Turborotalia. Quantitative biostratigraphy reveals highest and lowest occurrences of key marker taxa including Turborotalia frontosa, Guembilitrioides nuttalli, Morozovelloides aragonensis, and Globigerinatheka kugleri. Other secondary bioevents are also well constrained including Morozovelloides lehneri and several acarininid species. Our study allows for significant revision and recalibration of planktonic foraminifera SubZones E7b through Zone E11.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Biostratigraphy; Blake Nose; Blake Plateau; Cenozoic; Eocene; Foraminifera; Invertebrata; Leg 171B; Microfossils; Middle Eocene; North Atlantic; ODP Site 1051; Ocean Drilling Program; Paleogene; Planktonic taxa; Protista; Tertiary
Coordinates: N300311 N300311 W0762128 W0762128
Record ID: 2013073287
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States