The St. Dominique fault has been customarily regarded as a thrust fault because of its close spatial association with the thrust faults of Logan's Line. It also is, however, closely associated in space with the normal faults in the St. Lawrence Valley. Moreover, evidence from the shape of the fault-trace in plan and from possible cognate structures favor the interpretation that the St. Dominique fault is a normal fault. This fault, as well as other normal faults in the St. Lawrence Valley, seems to have formed during the Mesozoic Era.

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