Results are presented of a detailed gravity survey over the Saguenay valley and adjacent areas. Gravity anomalies have been separated into features of long and short wavelength by the method of upward projection, and interpreted in terms of crustal models. A negative anomaly over the lowlands can be explained by downfaulting of denser units within the crust, giving support to the hypothesis of a graben structure. Downward displacement of the Mohorovicic discontinuity would be compatible with the observations, but cannot be verified by the gravity field alone.

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