- 93 - 

 ajhCTIOK III. GOMCUieiOHS 



From the d«te presented in tM preceding Tjsgee 

 e aumber of coaoluwi on s may be drawn ©once ruing the betlgr- 

 metry end bottom ««disi@nt& lffiEm«cii@telj siirrotmding leeXand. 



1. ^^€iatit4»tively saM la the most Im-portimt 

 bottom sedimeat ob the ah&Xt, It predoi&la&tes over other 

 sediiaeuts ofl' the vmstftrA, soutJticrii, esuterQ^ £M oastern 

 belf of the aortbera ooasts. 



MiaerelOjlcally it la entirely volcanic in 

 oontenty and h&& been d@rir®d rrom gl^alal, !9tr€»«m, @ifid 

 wind erosion of voloenie rot^ks or els# tilreotly fror^ vol- 

 oenic eruptions, quartz &»m. is» not knoMt in Iceland, 



2« Gravel Is the next Siost i^ox^t^nt bottom 

 aedisieat sfter s«nd, ooverlni;; Isrge @r«@£s off all coasts 

 from tbe shore to the out«r e^e of the shelf* Its pro- 

 beble souro69,in ard@r of ii&portancs, @re: (l)residual 

 fro&i 8 period of lowered a^slev^l, with resultant wev® 

 erosion «ind probeble stre£>m erosion on rook exposed on 

 the shelf; (2) w«<ve eroaion on the present rooky coast; 

 (3) aubousrine vulCBnism; and (4J llelptoeeae glscietion 



on the ah«)lf. 



3« Off the western half of the northern coast 

 sedimentation i& controlled by e series of aorth-trendiiir 

 de&pn: end benka, with oiud flooring the deeps and gravel. 



