452 



LAUGHTON 



[chap. 18 





HBM«nc«'-: 



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i 



Fig. 20. 48= lO'N, 07= 31'W. Depth 172 m. Near edge of continental shelf west of Ushant. 

 Area of picture 2 by 3 m. (Photo by N.I.O.) 



Short -crested I'ipple marks of wave-length 15 cm in quartz sands. 



Fig. 21. 47= 42'N, 07° 34'W. Depth 475 m. Near the top of continental slope west of 

 Ushant. Area of picture 2 by 2h m. (Photo by L.G.O.) 



Small long-crested ripple marks superimposed on larger ones. 



