1 There would probably be few ripples as the currents in the walls 



2 and along the floor are weak. There is a question about whether these 



3 canyons, such as Heeltapper, which incised a shelf only a few 



4 kilometers, could be affected by warm-core rings or not. Do they reach 



5 into the canyons? Are they an effective erosional agent? 



6 The floor would be mainly silty sand with few ripples, not large 



7 bedforms, and it would be a depositional area of sand and silt and clay, 



8 similar to the gullies on the upper slope. 



9 Thank you. Any questions? 



10 DR. BUTMAN: Page, in Lydonia Canyon schematic, you showed the 



11 wall currents--the wall environment as being more energetic than the 



12 axis. What's the data which suggest that? 



13 DR. VALENTINE: The wall? 



14 DR. BUTMAN: You said the wall is more--the currents on the wall 



15 are stronger than in the axis in Lydonia. 



16 DR. VALENTINE: I said the currents on the rim, I was talking 



17 about the strong currents on the rim. 



18 DR. BUTMAN: In your schematic map you showed light blue and then 



19 pink, I guess. It was light blue on the walls and pink in the axis. 



20 DR. VALENTINE: My reasoning was that the silt--that you get more 



21 of a silt and clay buildup, silt and clay from the bioerosion in the 



22 canyon, plus the shelf sand coming in tends to buildup on those walls, 



23 because the currents aren't as strong as they are in Oceanographer 



24 Canyon. 



25 Whereas in Oceanographer Canyon, the silt and the clay and the 



26 sand mix together, but the currents are fairly strong, especially along 



27 the lower walls, and you don't get as large a buildup, and you also get 



28 more bioerosion because of it. 



29 In areas where you have buildups of this eroded debris plus lower- 



30 sloping walls, that would cover up the silt and clay and, in effect, 



31 reduce the bioerosion. 



32 I'm not saying that Lydonia Canyon doesn't have areas of steep 



33 walls which are heavily bioeroded, but I have the feeling that 



43 



