Evidence for Late Quaternary aeolian activity in the Roraima-Guyana region

Auteurs :
LATRUBESSE, E.M.
NELSON, B.W.

Description :
New evidence is provided for the aeolian origin of the upper unit of the Boa Vista Formation, found in the eastern part of the Brazilian state of Roraima and in the neighboring Guyana. This unit has 2 geomorphologically/sedimentologically distinct domains : a sandy and a silty realm. Located to the east and southeast (upwind) of the silty realm, the sandy realm includes very highly eroded, inactive parabolic and linear dunes and sand sheets. These results are based on remote-sensing and photo-interpretation. Discussion on the paleoenvironmental conditions.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2001, vol. 43, n°. 1, p. 63-80, Collation : Illustration, Références bibliographiques : 47 ref.

Date :
2001

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena