1 r 



"" — r 



i — | i | i | 1 — | — 



ACTIVE CLAY > 1.25 



- NORMAL CLAY 0.75 

 INACTIVE CLAY < 0.75 



A33, 30-36 

 A33, 6-12 



B87, 6-12 rifl**^ - 



j I i I i I i 



V°^sc<* rt£ 



0.18 

 T" CALCITE 



,£..., Q.O QUARTZ, 



20 30 40 50 60 70 



CLAY- SIZE FRACTION (<2 M ),% 



80 



FIGURE 16. ACTIVITY CHART OF CORE SAMPLES WITH KNOWN CLAY -SIZE 



MINERALOGY. NUMBERS INSCRIBED ALONG THE CIRCLE REFER 



TO ACTIVITY. SEE TEXT FOR DISCUSSION 



51 



