1 DR. MACIOLEK: The presentation-- 



2 DR. GRASSLE: The first day things included a lot of information 



3 about the deeper parts of canyons. 



4 I think it is okay to preface the second day discussion by saying 



5 that we decided to focus on the upper parts of canyons, and define what 



6 that is. 



7 DR. MACIOLEK: It certainly makes sense to have a statement up 



8 front defining what it is we are talking about. 



9 DR. GRASSLE: Yes. I think we have to have the definition of 



10 "canyon" up front, because that is the point all through here. 



11 Page, are you going to write that? 



12 DR. MACIOLEK: He suggested it. He can take a crack at it. 



13 DR. GRASSLE: I think you should write both definitions, yes. 



14 I guess I would go below two hundred meters for the second part of 



15 the discussion. A lot of what Dick is talking about is quite a lot 



16 deeper than that. 



17 DR. VALENTINE: What I mean is where the canyon crosses the shelf 



18 break--where it crosses the 200-meter isobath layer. Some of them are 



19 quite deep at that point. Is that what you were referring to? 



20 I had the impression you were talking about a maximum water depth 



21 of 200 meters. I mean, if you took a vertical plane through the 100- 



22 meter isobath on the continental slope, where the canyon intersects 



23 that, that is the part I am-- 



24 DR. GRASSLE: There are a whole lot of canyons I do not 



25 immediately visualize--that is my problem with that. 



26 DR. VALENTINE: Otherwise, some of these canyons go out endlessly 



27 on the continental slope. 



28 DR. MACIOLEK: It would probably be useful to have an 



29 illustration--a generalized illustration--but I think it is going to 



30 have to-- 



31 DR. GRASSLE: Maybe what we could do is just do the best you can 



32 with this in terms of--so long as we include the upper parts of canyons. 



33 Maybe you could just add a phrase that says that. Mostly this 



34 would just include—why don't you just give examples for specific 



354 



