418 DALE— CAMBRIAN MANGANESE DEPOSITS OF [April 25, 



in great part shaly in composition. The nodules of this band 

 suggest a very possible analogy to those of 219 A 5, 11, 12, 13, and 

 B 5. In as much as this bed is somewhat phosphatic, the phosphate 

 in all likelihood is associated with the nodules, as is the case with 

 the nodules of 219 A 13 of Manuels. This bed is structurally and 

 mineralogically quite similar to the phosphatic beds of Manuels. 



Long Pond Section. — About 2^ miles southwest of Manuels 

 and west of the railroad and wagon road (see Fig. 35), manganese 

 occurs, in a low cliff, as nodular and banded layers interbedded with 

 shales. Though the manganiferous beds at this locality are con- 

 siderably more oxidized than those at Manuels, the occurrence as a 

 whole is similar and it is necessary to present the section with only 

 brief macroscopical descriptions of the important beds (Fig. 36). 



Loc. Number. P"t 



219 F 10 Glacial mantle. 



9 Manganiferous green shale. 



8 Phosphatic nodular manganese shale i.o 



7 Manganiferous nodular and lenticular green shale 5.0 



6 Banded nodular ore 2.6 



5 Fissile green shale 0.8 



4 Manganiferous banded ore o.i 



3 Massive nodular green shale 0.6 



2 Nodular shale • 6.0 



I Heavy green olive shale 3.0 



219 F 2 of the above section corresponds quite closely to the 

 lower nodular bed, 219 A 4a, of Manuels (see page 392), chiefly be- 

 cause of the presence of abundant discoidal-shaped nodules identical 

 with those at Manuels. The nodules have altered for the most 

 part to a wad and clay, some having secondary manganese or white 

 clay centers and clay border zones and others with limonitic green 

 clay centers with secondary manganiferous clay border zones. The 

 weathered nodules are very abundant. 



219 F 6 is a heavy manganiferous bed composed of several Yz" 

 to 3" red, brown and green manganiferous seams separated by thin 

 nodular shale laminations that are now red. It is quite evident that 

 this bed is a continuation of either 219 A 7 or 10 of Manuels. The 

 interior of some of the weathered nodules is a red and green 

 residual clay. The manganiferous seams weather reddish and 

 greenish. 



