Ouguerram, A. and Visset, L. (2001) Palynological study of the gesvres valley: History of the vegetation and first evidence of the existence of a marine environment during the holocene in the erdre river system (Loire River basin, Massif Armorican, France) Histoire de la végétation et premiére mise en évidence d'un milieu marin pendant l'holocéne dans la vallée de l'erdre et le val de gesvres (bassin versant de la loire, Massif armoricain, France). Quaternaire, 12 (3). pp. 139-148.

Full text not available from this repository.
Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....


Pollen studies of a peat bog in the Erdre valley, a downstream tributary in the Loire River basin, revealed the stages in the filling in of a deep thalweg from the Atlantic chronozone. For the first time, analysis showed that the Flandrian sea penetrated into this valley from around 7350 B.P. to around 6340 B.P., depositing nearly ten metres of fluvial and marine mud in 1,000 years. From around 5770 B.P. to our time, a peat deposit was superposed on the mud. It is very likely that a hiatus occurred in the sedimentation process relative to erosion during the Sub-Boreal marine regression. Signs of human activity (cereals) attest to the presence of man in this region from the end of the Mesolithic or beginning of the Neolithic. Pollen of Juglans appears since mid-Neolithic, but populations first settled there during the Bronze Age, cultivating cereals and hemp and modifying the landscape. Clearings appeared in the forest during the Early Middle Ages, indicating a redeployment in agricultural and pastoral activities. The variations recorded in bog vegetation at the end of the Middle Ages could have been related to water-control operations undertaken at that time.

Item Type: Article
Uncontrolled Keywords: Holocene; palynology; vegetation history, France
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46
URI: http://eprints.umi.ac.ma/id/eprint/2973

Actions (login required)

View Item View Item