Start Dating on earth sub

Dating on earth sub

Luminescence methods are now frequently used for the dating of colluvial sediments, as originally suggested by Wintle & Catt (1985) and recently reviewed by Fuchs & Lang (2009).

More generally, it seems crucial to place the current channel adjustments in a large temporal trajectory of the morpho-sedimentary dynamics of the valley bottoms.

This hypothesis is similar to the model developed for larger basins in the French pre-Alps and the Jura Mountains, where bed material is coarser (Bravard, 2002; Liébault & Piégay, 2002).

In the last area streamflows are rare because of the high permeability of the subsurface.

Some discontinuous loess covers exist in the eastern part of the basin.

It is concluded that sediment deposition was mainly forced by sediment supply from ploughing areas.

Two short-lived phases of incision during the first half of the XIX century were probably caused by a decrease of sediment supply due to a decline in the frequency of heavy precipitation events.

the occurrence of extreme events such as heavy thunderstorms), and (iii) whether humans are using land for either agriculture (i.e.

disturbing the land surface by ploughing) or settlements (i.e. When a drainage system changes from stable conditions to either an erosional or depositional mode, this is often of major importance for local communities (e.g., due to the loss of fertile soil).

Testing our hypothesis requires the establishment of a high-resolution deposition chronology and to compare this with the historical evolution of hillslope land cover.

) is a right-side tributary of the Rhône River located near the city of Lyon (fig. From west to east, in the downstream direction, the basin drains a subdued degraded granitic and gneissic mountain (Monts du Lyonnais, a mostly rural area), a gneissic and partly granitic plateau (Plateau Lyonnais, a mostly peri-urban area in the Lyon neighbourhoods), and some inherited, mostly alpine, fluvial and glacial features (part of the urban area of Lyon).

Deux approches conduisent à des âges OSL cohérents entre eux et bien corrélés à des dates radiocarbone.