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Lake Yoa

Country: Chad
Region: Eastern Central Sahara
Varve Category: endogenic varves
Archive Type: lacustrine sediments
Lake Type: depression with groundwater-fed lake
Maximum Depth: 26.0
Surface Area: 4.3
Elevation: 380.0
Length of Record: 6100
DOI / Reference Link: Access Link
Reference: Francus P., Suchodoletz H. v., Dietze M., Donner R., Bouchard, F., Roy A.-J., Fagot M., Verschuren D., Kröpelin S., 2013. Varved sediments of Lake Yoa (Ounianga Kebir, Chad) reveal progressive drying of the Sahara during the last 6100 years. Sedimentology 60, 911–934.
Picture Authors: Stefan Kröpelin
macro varve pic

Description: Example of a varve sequence from a totally groundwater-fed lake in the hyper-arid core of the Sahara (3 mm precipitation vs. 6200 mm evaporation). Light reddish-brown laminas consist of clastic material (matrix-supported and rounded medium-to-very-fine sand and finer grains), dark reddish-brown laminas are mainly made of organic material
Picture Type: macroscopic