The morpho-sedimentary architecture of the lower middle garonne floodplain downstream of toulouse: first results

The subfossil tree deposits from the Garonne Valley and their implications on Holocene alluvial plain dynamics

“…Unit 3 is dated from the Roman epoch and aggrades over Unit 2. This last stratigraphic organisation is compatible with previous observations in Castelnaud'Estretefond (Carozza et al, 2013). These new data collected in the Bourret gravel pit complete previous data collected in the Garonne valley ( Fig.…”

“…8900 and 5000 cal. BP, as previously shown by the work around Castelnau-d'Estretefonds (Carozza et al, 2013). This episode is interrupted by a major phase of incision close to 5000 cal.…”

“…Three main stages of construction may be identified: (1) during the LGM, the yellow silt unit was deposited. This aggrading stage remains poorly documented but seems to overlap the Early Holocene (Carozza et al, 2013); (2) between ca. 8900 and 5000 cal.…”

“…No chronological data is available in this area for the Late Glacial to Holocene alluvial formations. Results obtained by Bruxelles et al (2010) and Carozza et al (2013) in the South of the Middle Garonne suggest that Fz1 is dated between the Late Glacial to the middle part of the first Holocene (c. 8900 cal. BP) and Fz2 from the second part of the Holocene (post 4400 cal BP).…”

Constraints on Pleistocene glaciofluvial terrace age and related soil chronosequence features from vertical 10Be profiles in the Ariège River catchment (Pyrenees, France)

“…In more distal areas of the piedmont, particularly downstream of Toulouse in the case of the Garonne River, the treads of T1 and T0 become topographically indistinct. Stratigraphic analysis of this low plain has revealed a complex Lateglacial and Holocene history involving a succession of many aggradational and incisional phases (Bruxelles et al, 2010;Carrozza et al, 2013).…”