1 If we take a total hydrocarbon parameter, this is saturated 



2 hydrocarbons, this is increasing concentration, and we take basically an 



3 odd-even index, the higher the number here, the greater the odd carbon 



4 preference, and the higher the number the greater the predominance of 



5 these plant waxes that I talked about in the previous slide, you see 



6 that these are several seasons of data from Georges Bank. 



7 We see two subjective groupings of hydrocarbon compositions. We 



8 see, just looking at group A and group B now, group B, if we go back a 



9 few slides, is source material that is predominantly plant wax. 



10 You go to group A when you add some of this unresolved complex 



11 mixture presumably sourced in petroleum. So, the difference between 



12 group A and group B, at the same ratio of odd carbons is just we're 



13 adding more of this UCM material in group B. 



14 If we look where these stations are, if we look at the silt-clay 



15 content of group A stations, we do see that these are, in fact, all the 



16 stations that have the higher silt-clay content. They are stations at 



17 the mud patch, they are stations at the head of Lydonia Canyon, they are 



18 stations at the Gulf of Maine and distributed elsewhere. 



19 What we're seeing here in group A is that with a little bit of 



20 fine-grained material, a little bit of clay material presumably, that 



21 material is enhanced in the degraded petroleum material. 



22 So, if we sprinkle a little bit of clay on top of this sandy 



23 distribution, we're getting increased--we're not changing the amount of 



24 plant waxes, but we are changing the hydrocarbon distributions. 



25 These are the composite compositional distributions on the bank. 



26 Group A with the fine-grained material having two sources, group B 



27 having the plant waxes. 



28 We do see a group C, and in the previous slide you saw the 



29 chromatogram which looks a little bit like--a lot like petroleum 



30 material. We saw in one of the seasons, this was in the winter, I 



31 believe in '77, a distribution in the sediments, it looked like we had 



32 tar specks in a lot of sediments of about ten different stations. 



33 The following season we did not see any of these group C 



34 hydrocarbon distributions present. Presumably these tar specks had been 



80 



