The GEOSCIENCE group federates different scientific activities devoted to the identification and dating of various events (discrete or continuous) which occured in the Earth geological history. Indeed, time is very important in almost all geosciences fields, so that investigated materials and processes are much diverse.  All research axes  are connected to the two other groups of the LSCE , the "Evolution du climat " and the "Biogeochemical cycles" groups.

This approach is based on a large panel of high-tech instrumentations, combined to a deep understanding of measurement processes and practical use. Initially, this approach was developed at the Centre des Faibles Radioactivités (the CFR, the laboratory existing before the LSCE) for radiogenic isotopes, such as 14C and several other radioactive families. Now it is ealso xtended to non-radiogenic geomarkers, like cosmic and volcanic material, and also to stratigraphic studies. A base for the cohesion of the GEOSCIENCE group is the complementarity of the different tools used which are developed and used.

Scientific studies are connected to the two other groups and they are open to the entire french scientific community. Two axes can be identified :

- Geochronology of recent Quaternary, based on radiometric dating and stratigraphic markers characterization. Several research activities are connected to environment evolution and to dynamics of the pre-historic population.

- Kinetic and  balance of material transferred between continents, oceans and sediments. Extra-terrestrial material is often used as a stratigraphic marker, and some cosmic events are considered as perturbations of external origin.