1 DR. BOTHNER: Let's see. I would describe it as--I would say that 



2 the cores that we look at do not show stratification from the standpoint 



3 of textural variability. You don't find a sand layer on top of a clay 



4 layer or that sort of thing. 



5 I also would say that there is not a jumbled pattern of lead-210 



6 as a function of depth but, rather, a uniform, logarithmic, nearly 



7 logarithmic, decrease in lead-210 activity which suggests fairly uniform 



8 mixing; that is, uniformly decreasing mixing intensity as a function of 



9 depth. That is the way I interpret the lead-210 profile. 



10 So, the end result is that you cannot use lead-210 independently 



11 to date these sediments because the mixing is so intense. 



12 DR. VALENTINE: Page Valentine. I think we have indirect evidence 



13 that there is sediment resuspension, refined sediment resuspension, in 



14 Oceanographer. You only have Lydonia up there. 



15 DR. BUTMAN: Actually, I agree. In your direct submersible 



16 observations, we see there definitely is resuspension; it is just not 



17 as--I guess the reason why I didn't put Oceanographer there was that the 



18 accumulation of fine-grained sediments, the stripping is there, 



19 potentially there, but whether it actually stays in Oceanographer is the 



20 question. 



21 DR. VALENTINE: But I mean the mechanism is there to get the fines 



22 up to strip and get transported somewhere else and settled out. 



23 DR. BUTMAN: That's right and also, for this vertical mixing, it 



24 may not actually have to accumulate, but it may be mixed down into the 



25 sediments or it might stay there. 



26 Are there any biological processes which would--I don't know, 



27 filter feeders or something like that, that would enhance the potential 



28 for accumulation in the canyons? 



29 DR. TEAL: Filter feeding. 



30 DR. KRAEUTER: Filter feeding would certainly do it and it would 



31 give you a mechanism to pelletize anything that was stripped out, 



32 putting it down into the sediments and then the deposit feeders or 



33 whatever would mix it down into the sediment, so you have got a direct 



34 link to accumulation and retention. 



201 



