Home » Nannofossils
Category Archives: Nannofossils
Evolution of Neogene fossil ceratoliths (Coccolithophores) by duplication
The calcareous nannofossils of the genus Ceratolithus, known for their horseshoe shape (referred to as ceratolith), evolved from the Orthorhabdus rugosus, a rod-shape nannolith with three rodded blades (sinistral, median, and dextral). The sinistral and median blades gave rise to the sinistral and dextral arms of the ceratolith, while the dextral blade was reduced to a keel. […]
Nannoplankton Congress (INA 19) in Llandudno (Wales)
The 19 International Nannoplankton Association Congress took place on the coastal city of Llandudno (Wales) from September 9 until 13, 2024. The Ceratoliths are a type of calcareous nannoplankton which allow to subdivided the Messinian and the Pliocene stages. A series of works by Carlos Lancis, José Enrique Tent-Manclús and José-Abel Flores, comparing Light Microscope […]
Origin and evolution of the Neogene calcareous nannofossil Ceratolithus
Sediment samples of deep marine oceanic ODP boreholes from sites 999 in the Caribbean Sea and 1237 in the Eastern Pacific Ocean covering the period between 6 and 4.5 Ma have been studied with a focus on ceratolith evolution. Orthorhabdus rugosus is a nannolith with three blades (sinistral, median, and dextral) that first appeared during […]
Evolution of Amaurolithus: Amaurolithus delicatus marking the Messinian bottom
After a complete study of the sediment samples from Ocean Drilling Program (ODP) Sites 999 and 1237 in the Caribbean Sea and Eastern Pacific Ocean in order to monitor the evolution of ceratoliths. The First Occurrence of Amaurolithus delicatus marks the bottom of the Messinian Stage. The first ceratholith, A. primus, has two arms and a horseshoe […]
Origin of the ceratolith genus Amaurolithus
Sediment samples from Ocean Drilling Program (ODP) Sites 999 and 1237 in the Caribbean Sea and Eastern Pacific Ocean were studied to monitor the evolution of ceratoliths from 7.4 Ma to 6 Ma. Orthorhabdus rugosus shows high variability at the end of the Tortonian to the Early Messinian (7.35 Ma to 6.91 Ma), resulting in […]
Recent Comments