1 So, this is a fairly predictable geochemical environment in the 



2 absence of point sources of hydrocarbons on the bank. 



3 PAH versus the single terrigenous plant wax. There is a very 



4 strong correlation between PAH and the plant material, implying either 



5 that they are mixed together and distributed similarly with a fine- 



6 grained fraction or they are sourced similarly on shore and distributed 



7 along the slope and the rise and ultimately distributed from the Gulf of 



8 Maine types of areas. 



9 One of the interesting facets of having looked at hydrocarbons 



10 from a number of these OCS environments, this is a composite plot of 



11 another aromatic series the flouranthenes and pyrenes versus total 



12 organic carbon. 



13 I've combined North Atlantic data, mainly from the shelf and a 



14 little bit in the canyon, the head of Lydonia Canyon, with some of the 



15 south Texas study area. Generally we see fairly similar relationships 



16 from the two areas. 



17 Why these are fairly similar, I don't know. Probably because the 



18 aerial transport of these combustion ratios are fairly universal in a 



19 lot of the OCS environments. 



20 The slope and rise program focused on a fairly small number of 



21 stations over several years. This was the reoccupation of the SEEP 



22 transect, this Lydonia Canyon station, high and low topographic areas. 



23 I want to show you some of the hydrocarbon data from these areas. 



24 They generally support the same observations of the well -mixed 



25 steady state environments, with the hydrocarbons largely forced by the 



26 grain-size distributions. I tried to color code this nonsense here. 



27 Basically these are examples of PAH distributions on the slope and 



28 rise, and what we are seeing again is that the PAH's, this is an FFPF, 



29 the fossil fuel index, remember it goes from to 100, depending on how 



30 much of the distribution is petroleum or fossil material. 



31 It's generally low, 20, 30 percent, sometimes getting a little 



32 higher into the 50s. This implies that most of the hydrocarbons that 



33 are found on the slope and rise, as we found in the depositional areas. 



82 



