1 Oceanographer Canyon shows more of it because of its shape and the 



2 strong currents that are flowing in it. 



3 DR. BUTMAN: Here's what I was asking, though. In Oceanographer 



4 you show essentially an active axis and more tranquil walls, in Lydonia 



5 you show it the other way around, more tranquil axis and more active 



6 walls; the tranquil axis and active walls. 



7 I don't have much data on the walls, but I would have said that my 



8 gut feeling is that the axis is more active than the walls. 



9 DR. VALENTINE: I think I was trying to depict the floor of 



10 Lydonia as being a depositional area. Maybe it's not a perfect analogy, 



11 but I was trying to--in my mind I was saying, well, the purple areas are 



12 depositional areas. 



13 The amount of sediment going into Lydonia or onto its floor is too 



14 great for the currents, even though they are fairly strong for them to 



15 move it out of there, or even winnow out the fines. 



16 DR. HECKER: Page, I just want to point out that my experience 



17 with Lydonia, up around not the very head region up there where you've 



18 got the big purple circle, but further down, most of what I find is yes, 



19 you've got a fine-grained sediment right in the axis. 



20 You're talking about a relatively narrow axis, but the walls are 



21 solid cliff. I get the impression from that, that that is sediment- 



22 covered area, and those walls are out and out vertical and cliff 



23 throughout the whole length of Lydonia Canyon. 



24 DR. VALENTINE: Well, not throughout the whole length. In the 



25 deeper parts, as in Oceanographer you have Cretaceous outcrops down 



26 there. I'm not talking about--I can't depict vertical cliffs on this 



27 kind of a thing. 



28 The floor below the vertical cliffs is a depositional area. Those 



29 vertical cliffs of Cretaceous and Eocene outcrops are--the Eocene are 



30 not hard, but they are hard rock, we're not really talking about, at 



31 least I'm not really discussing that here. 



32 I'm talking about mainly the shallower parts of these canyons. On 



33 a diagram like this I can't--you're right, though, there are vertical 



34 walls, but still below it is the depositional area. 



44 



