1 Page talked about observations along especially the east rims of 



2 canyons showing ripples migrating to the west into the canyon. He 



3 showed those both in Oceanographer and Lydonia. It is a somewhat 



4 indirect measure but, again, the answer is yes. Actually, the answer is 



5 yes to all of these. 



6 Dave Twitchell's high-resolution surveys in the head of the 



7 Lydonia Canyon again show this wedge of fine sands and silts with a 



8 major wedge in the head of the canyon but thinning out onto the shelf 



9 adjacent to the canyon so, again, that is sort of indirect evidence, but 



10 it does suggest that particles enter the canyon from the shelf. 



11 Finally, Mike presented some accumulation rates in the head of 



12 Lydonia Canyon--only Lydonia Canyon. I think that's actually the only 



13 direct accumulation rates we have in any canyons, is at about 150 meters 



14 in the head of Lydonia Canyon. 



15 Again, I call that indirect evidence. It is not absolutely 



16 certain that that material is coming from the shelf. It could actually 



17 be coming from the canyon walls, but I think in that case, it is pretty 



18 definite that the particles are coming from the shelf. 



19 I think at least one major conclusion is that particles do at 



20 least cross over the rim and enter the canyon from shelf environments. 



21 Based on this data, from areas quite--we don't actually know the zone of 



22 influence, where the particles come from, but based on this data, it's 



23 at least 5 or 10 kilometers, the distance of the closest rig. 



24 Is there a discussion on that? Is that an important question to 



25 address? 



25 DR. VALENTINE: I would like to modify that a bit. 



27 DR. BOTHNER: Okay. 



28 DR. VALENTINE: Concerning the third line, the submersible 



29 observations at the rim, well, we had observations at the rim, on the 



30 wall and in the axis. We are pretty sure that the canyons are underlain 



31 by this Pleistocene silt and clay. At least, we have never seen any 



32 outcrops of unconsolidated coarse grain sediment in these parts of the 



33 canyons. 



186 



