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During field work in the archipelago of southwestern Finland, many tension cracks parallel with the axial plane were observed. As the axial plane is nearly perpendicular to the folding stress, it seemed odd that tension cracks had formed in this direction. These cracks are too common to be due to pure coincidence, so I shall here discuss a possible causal connection between the tension cracks and the folding.

Tension cracks parallel with the axial plane