SECT. 2] 



MICROTOPOGRAPHY 



455 



Fig. 25. 41° 12'N, 15° 14'W. Depth 3112 m. Seamount west of Iberia plain. Area of 

 picture 4 by 5 m. (Photo by N.I.O.) 



Qlohigerina sands showing a field of long-crested ripi^le marks parallel to the con- 

 tours of a sloj3e. Boulders and cobbles are partly buried by sediment. 



* I 



• ■^■^"">^' 



I "'« 



Fig. 26. 41° 12'N, 15° 14'W. Depth 2917 m. Seamount west of Iberia plain. Area of 

 picture 1^ by 2i m. (Photo by N.I.O.) 



Massive bedrock has channelled the current to jDroduce strong ripple marks. Where 

 the ciu'rent has emerged and slowed down, organic debris containing such fragments 

 as scaphopod shells and the spines of sea-urchins has been deposited. Several crinoids 

 can be seen on the left. 



