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SCIENCE PROGRESS 



their normal width, unlike many examples where there has been 

 parting between the beds, and flow of the strata in, the fold, so 

 that the limbs become thin and the axis thick. It will be seen 



Fig. 3. 



that the beds in the angle of the bend have been crumpled back- 

 wards ; to realise the tension on the outer beds which this has 

 necessitated, take a pile of loose sheets of paper with each hand, 



