conodont
/ˈkoʊnəˌdɑnt/
noun
- A small, tooth-like fossil from an extinct group of ancient marine animals, used by scientists to date rocks and study evolution.
- Conodont fossils help researchers determine the age of sedimentary rock layers.
- The geologist found a well-preserved conodont in the limestone sample.
- Under the microscope, the conodont showed tiny serrations along its edge.