388 



DALE— CAMBRIAN MANGANESE DEPOSITS OF [April 25, 



Fig. II. Microphotograph of section of Cryptozoon nodule, 219 A2; 

 slide 292; enlarged 22 diam. a, ferruginous band; b, calcite. 



Fig. 12. Microphotograph of Cryptozoon nodules from 219 A2, showing 

 barite being replaced by chlorite; slide 292; enlarged 22 diam. a, barite; b, 

 chlorite; c, ferruginous and calcareous shale. 



