Lake Pavin History, geology, biogeochemistry, and sedimentology of a deep meromictic maar lake

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Fig. 9.8 Pictures (©P. Boivin, D. Miallier) showing the stratigraphic
succession of six deposits associated to the terraces of the Couze River
and the fan formed by the lake outlet in the Gelat Valley (see Figs. 9.6a,
b ). ( a ) Close up view of two bombs sags in the muddy, silt and sand

sized maar deposit 3a. ( b ) Stratifi ed, cross-bedded layers of maar surge

deposit 3a impacted by bomb sags above the oxidized lapilli-fall deposit

of Monchal. ( c and d ) Gravel and coarse sand layers 4a about 0.5 m

thick fi ll shallow channel cut down in the undulated top of the maar

J.-C. Thouret et al.

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