ORI 



Figure 9. (Left) Irregular carbonate edifice recovered from the 

 outer continental shelf off northern Oregon in Aloha trawl 

 in 1987. (Right) Sketch of edifice showing samples (1-6) 

 taken for geochemical analyses. Note small cemented tubes 

 illustrated in sketch (sample 3). ORI is the oxic reducing 

 interface (see text for explanation). Analyses are given in 

 tables 2 and 3. 



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