Subdivision and correlation of macroscopically uniform-appearing sedimentary series, as well as those of varying lithology, can be facilitated by thin-section studies of the characteristics, frequencies, and vertical and lateral variations in distribution of such microcomponents as detrital and authigenic minerals and pelagic and benthonic microfaunas. Examples of the application of these data in the interpretation of mechanism and environments of sedimentation in (mainly) Cretaceous sequences of Haute-Savoie, France, and Valais, Switzerland, are given.

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