1 whole area of the slope? That is a question that, until you have some 



2 kind of a handle on it, you cannot make a hypothesis about how important 



3 an effect might be unless you could dismiss an effect. 



4 DR. AURAND: Okay. Discussion on that point? I think that's a 



5 reasonable suggestion. 



6 DR. BUTMAN: In part for preparation for this afternoon, I tried 



7 to make a kind of summary list to synthesize a number of the threads 



8 that ran through the discussion yesterday and I wrote it on a few 



9 viewgraphs. 



10 It would probably take maybe a half an hour or so to go through 



11 that, if you want to, as a way to sort of direct the conversation this 



12 morning. As a way to direct the conversation this morning, it might be 



13 worth it to do that for the first half-hour and then we could go back 



14 into the hypothesis if you want. 



15 DR. AURAND: In keeping with John's suggestion, then, why don't we 



16 consider letting you go first with the geology and geochemistry and then 



17 do biological processes and then come back to the hypothesis? Is that 



18 reasonable? 



19 DR. TEAL: Yes, that's what I am suggesting. 



20 DR. AURAND: That's what you are suggesting. Is there a consensus 



21 that that is a reasonable way to approach this? I see a consensus. 



22 You've got the chair. Everyone should say who you are when you speak 



23 up. 

 24 



25 GEOLOGY AND GEOCHEMISTRY--DR. BRADFORD BUTMAN. DISCUSSION CHAIR 

 26 



27 DR. BUTMAN: I don't know why I volunteer for these things, but 



28 anyway, just to make sure we are all talking about the same kind of 



29 morphology of canyons, we heard a lot of discussion yesterday about what 



30 is what in a canyon. 



31 (Showing of viewgraphs.) 



32 I just wanted to give a sort of schematic of what my picture of a 



33 canyon is. I have shown three views here, a plan view and two cross- 



174 



