To measure the duration of long events in relation to the human scale and ancient in relation to the historical approach, geologists interpret natural records in landscapes and rocks as well as the presence of fossils. The diversified methods of relative chronology (ordering events in relation to each other) are constantly supplemented by the geochemical tools of absolute chronology (giving an age to a geological event). Stratigraphy involves a variety of techniques, based on geological and other sciences. Moreover, the elaboration of the various methods of approach, the assembly of which constitutes the stratigraphy, is the result of a slow and collective creative activity lasting about a century.
- Enseignant: LILIA BEGUIRET
In stratigraphy, chronology is presented in two aspects: • Relative, which makes it possible to organise geological structures and events in relation to each other over time, by giving them a relative age. This relative dating is based on fundamental principles of stratigraphy. The stratigraphic scale of geological time is established from the lithological data (lithostratigraphy) and palaeontological content (biostratigraphy) of the different layers of terrain. • Absolute, allowing the exact or numerical age of rocks or geological events to be assigned
- Enseignant: LILIA BEGUIRET