IGCP 652: Reading geologic time in Paleozoic sedimentary rocks: the need for an integrated stratigraphy.

IGCP 652: Reading geologic time in Paleozoic sedimentary rocks: the need for an integrated stratigraphy.


Major events punctuated the Paleozoic: ecological crises and diversifications, shifts in ocean chemistry, climatic changes, etc. One of the key-obstacles in understanding these events lays in the difficulty of providing precise estimates of the duration represented by a sequence of Paleozoic sedimentary rocks. This lack of temporal precision severely hampers the evaluation of forcing mechanisms and rates of climatic, ecological or biogeochemical changes in the Paleozoic. It is therefore essential to first improve the Paleozoic timescale to then unravel the history of the Paleozoic Earth system.
Cyclostratigraphy is a powerful chronometer, based on the detection of the Milankovitch cycles in the sedimentary record. Those cycles result from periodic variations in the Earth-Sun system, affecting the distribution of solar energy over the Planet influencing Earth’s climate on time scales between 104 and 106 years. Through the integration of this astronomical time scale with biostratigraphy and radio-isotopic dating, this project intends to document the environmental evolution during the Paleozoic with a focus on the Ordovician to Devonian (485 – 359 million years). It gathers participants (> 200) from all over the world (36 countries) and promotes the participation of young scientists and scientists from developing countries.

Plus d'actualités


Une approche innovante basée sur les Slepiennes pour inverser le signal KBRR de GRACE et localiser les informations hydrologiques à l’échelle des sous-bassins.

GRACE spherical harmonics are well-adapted for representation of hydrological signals in river drainage basins of large size such as the Amazon or Mississippi basins. However, when one needs to study […]



Détection des marées dans la Garonne à partir de données GNSS

Signal-to-noise ratio (SNR) time series acquired by a geodetic antenna were analyzed to retrieve water heights during asymmetric tides on a narrow river, using the Interference Pattern Technique (IPT) from […]



L’élévation discontinue de la façade pacifique des Andes

En quelques dix millions d’années, la façade pacifique des Andes s’est soulevée d’environ mille mètres. Si ce phénomène est bien attesté par les scientifiques, néanmoins l’histoire de ce soulèvement et […]