Figure F1. A. Smear slide of the residue remaining after a 9-hr 2-M Na2CO3 digestion of site survey Sample EW9709-3PC: 1192-1194 cm (#0937, slide 06R). B. Smear slide of the solid residue remaining after a 14-hr 2-M Na2CO3 digestion of site survey Sample EW9709-3PC: 750 cm (#C624, slide 23Y). C. Solid residue remaining after a 9-hr KOH digestion of site survey Sample EW9709-3PC: 1192-194 cm. Note occasional biogenic opal fragments (#0940, slide 07R).

Figure F1. A. Smear slide of the residue remaining after a 9-hr 2-M Na₂CO₃ digestion of site survey Sample EW9709-3PC: 1192-1194 cm (#0937, slide 06R). B. Smear slide of the solid residue remaining after a 14-hr 2-M Na₂CO₃ digestion of site survey Sample EW9709-3PC: 750 cm (#C624, slide 23Y). C. Solid residue remaining after a 9-hr KOH digestion of site survey Sample EW9709-3PC: 1192-194 cm. Note occasional biogenic opal fragments (#0940, slide 07R).