I9I4.] CONCEPTION AND TRINITY BAYS, NEWFOUNDLAND. 395 

 The analyses of the green and pink nodules are as follows : 



Analysis B. 

 Green Nodules. 



SiO, 10.31 



FeA 7-35 



ALO3 3-68 



MnO 31-76 



CaO 10.46 



MgO 1.80 



BaSO^ 6.43 



H,0 2.85 



CO, 25.31 



99.96 



Analysis B i. 



Recalculation. 



MnCOa 39-56 



MnO 7.30 



CaCOs 18.61 



MgCOg 3-79 



SiO, 5-94 



BaSO, 6.29 



H,0 1.51 



Fe,03 7.35 



2H,0-AL03-2Si03 9-17 



99-52 



Analysis C. 

 Pink Nodules. 



SiO, 5-14 



FcoOs 1-40 



ALO3 1-64 



MnO 20.49 



CaO 32.92 



MgO 01 



H,0 1.65 



CO, 2,6.77 



100.02 



Analysis C i 

 Recalculation. 



CaCOs 58.05 



MnC03 29.32 



MnO 2.34 



SiO, 3-78 



FCoOa 140 



H,0 1.06 



2H,OAL03-2SiO, 4-07 



100.02 



The pinkish crystalline mineral which exhibits a rhombohedral 

 cleavage, has a hardness of about 3, effervesces freely with HCl acid, 

 and, with the above composition, is essentially a manganiferous cal- 

 cite. The excess MnO probably exists as a peroxide of manganese 

 as indicated by the considerable amount of chlorine which was given 

 off while the sample was being digested with HCl acid. As no thin 

 sections were made of this specimen no petrographic confirmations 

 can be made. 



The upper subdivision of 219 A 4 (219 A 4b) is a greenish and 

 reddish nodular shale bed measuring 2.9 feet in thickness and divis- 

 able into three roughly distinct portions. The lower part, 219 A 4b i 

 is a greenish red shale overlaid by a reddish shale with occasional 

 small nodules measuring about % inch in diameter (Fig. 13, and 19). 



