Biostratigraphic and morphometric analyses of specimens from the calcareous nannofossil genus Tribrachiatus
October 25, 2017
Biostratigraphic and morphometric analyses of calcareous nannofossil assemblages from one outcrop and two cored sections of lower Eocene sediments reveal the presence of two new species: Tribrachiatus lunatus sp. nov., and Tribrachiatus absidatus sp. nov. Differences between the new species and Tribrachiatus orthostylus are discussed. The first occurrence of the two new species is just below the calcareous nannofossil Zone NP11/NP12 boundary, close to the Chron 24r/23n boundary, and thus they are globally useful biostratigraphic markers.
Citation Information
| Publication Year | 2017 |
|---|---|
| Title | Biostratigraphic and morphometric analyses of specimens from the calcareous nannofossil genus Tribrachiatus |
| Authors | Jean Self-Trail, Ellen Seefelt, Claire L. Shepherd, Victoria A. Martin |
| Publication Type | Article |
| Publication Subtype | Journal Article |
| Series Title | Journal of Nannoplankton Research |
| Index ID | 70191914 |
| Record Source | USGS Publications Warehouse |
| USGS Organization | Eastern Geology and Paleoclimate Science Center |