CGRG Bibliography of Canadian Geomorphology
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Author : Dionne, J-C.
Date : 1981.
Title : Contorted structures in unconsolidated Quaternary deposits, Lake Saint-Jean and Saguenay Regions, Quebec
Publication : Geog.Montr.
Issue : 25:
Page(s) : 5-33.
Abstract
A great number of minor deformational structures were found in the lowlands of the Lake St-Jean and Saguenay region, corresponding to the Laflamme Gulf area, and in the highlands of the Laurentides Shield (Southern Quebec). They occur at numerous sites mostly at superior levels, and sometimes at lower levels, in various unconsolidated Quaternary deposits. Intrusions, involutions, folds, festoons, pseudo-nodules, convolutions and various distorted laminations were seen in about 40 sites. The deposits include sand, silt, and silty clay of deltaic and marine origins, glaciolacustrine sand and silt, and fluvioglacial sand and gravel. It is believed that the contorted structures were contemporaneous to the deposition being formed by differential loading (density), slumping and water seepage. Periglacial processes could have been responsible for those contorted structures but this possibility was rejected because no evidence of the existence after the deglaciation of a cold climate necessary to produce cryoturbation in the soil has been found yet in the studied areas. If the sedimentary figures showed here give some information about the sedimentary surroundings, they cannot on the other hand serve as stratigraphic criterions nor to establish extraterritorial correlations.
Bibliography of Canadian Geomorphology