104 



PDS Core Layers and Grab Samples Mineralogy Means 



Coarse/ 1.5 t 

 Abundant 



Fine/ 

 Rare 



Survey 



□ Grain size 



■ Black porous material 



■ Oar1< minerals 



□ Flyasii 



■ Rbrous minerals 



□ Rock fragments 

 D Insect parts 



■ Plant fragments 

 O Benthic Diatoms 



□ Planktonic Diatoms 

 B Textured Ostnacods 

 D Smooth Ostracods 

 13 Pellets 



D Shell fragments 



■ Gastropod fragments 

 Q Bryozoan fragments 



Figure 4-28. Histogram comparing the mean abiindance (rare, common, abundant) and 

 particle size (fine, medium, coarse) for the mineralogical components of the 

 grab and core samples (CDM, pseudo-UDM, and ambient layers) 



The Portland Disposal Site Capping Demonstration Project, 1995-1997 



