Washington — Submarine Eruptions of 1831 and 1891. 147 



Norms of II. 



Corrected 

 8-34 



27-25 

 5-84 

 4-83 



24-50 

 7-44 

 6-03 



11-10 

 5-00 



In the prevalent classifications the rock is a vitreous feld- 

 spar-basalt scoria. The mode need not be discussed, as it is 

 indeterminate, owing to the large amount of glass present. 



Correlation of the Basalts. 

 In the following table are presented a number of analyses 

 made by me of basalts from the same general region and of. 

 characters similar to those here described. 



Uncorrected 



Or 8-34 



Ab 16-24 



An 11-40 



Ne_ 10-79 



Di 31-30 



01 5-02 



Mt 6-03 



II 11-10 



Ap none 



I 



II 



III 



IV 



V 



VI 



VII 



VIII 



48-97 



44-83 



45-72 



46-22 



46*55 



48-84 



47-66 



43-64 



16-37 



11-73 



12-45 



12-23 



14-55 



14-62 



14-36 



13-52 



1-33 



1-35 



1-57 



4-91 



3-17 



2-08 



2-33 



6-40 



8-56 



11-79 



12-01 



7-71 



7-88 



9-00 



8-44 



5-52 



6-22 



5.50 



5-29 



6-74 



8-61 



7-15 



8-19 



9-36 



7-49 



9-63 



9-58 



9-86 



8-75 



9-33 



9-36 



9-52 



4-09 



3-34 



3-40 



3-39 



3-71 



2-86 



3-51 



3-89 



1-72 



1-40 



1-08 



1-13 



1-62 



0-89 



1-54 



2-18 



0-38 



0-81 



0-40 



0-17 



0-14 



0-49 



0-17 



0-49 



0-08 



o-io 



o-oi 



0-05 



0-03 



0-07 



0-20 



0-16 



3-95 



6-88 



6-43 



5-68 



3-84 



3-57 



3-83 



4-55 



1-04 



2-14 



1-54 



1-46 



'0-55 



0-36 



0-45 



0-74 



0-06 



0-20 



0-16 





o-io 



0-04 









0-08 





0-15 







0-12 



0-08 



SrOO-03 



Si0 2 



A1 2 3 



Fe 2 O s 



FeO 



MgO 



CaO 



Na 2 



K 2 



H 2 + 



H 2 0- 



Ti0 2 



PA 



MnO 

 NiO 



100-34 99-70 99-82 99'55 99*62 99*89 100'54 99*60 



I. Andose (II.5.3.4). Graham Island, 1831. 



II. Camptonose (III.5.3.4). Foerstner Volcano, 1891. 



III. Camptonose (III.5.3.4). Dike in Costa Zeneti, Pantelleria. 

 Quart. Jour. Geol. Soc., lxiii, p. 74, 1907. 



IY. Camptonose (III.5.3.4). Monte Sant' Elmo, Pantelleria. 

 Quart. Jour. Geol. Soc, lxiii, p. 74, 1907. 



V. Camptonose (III.5.3.4). Block in tuff, II Fosso, Linosa. 

 Jour. Geol., xvi, p. 23, 1908. 



VI. Auvergnose (III.5.4.4-5). 

 Geol., xvi, p. 17, 1908. 

 MVII. Camptonose (111.5,3.4). 

 Jour, xxiv, p. 239, 1907. 



VIII. Monchiquose (III. 6. 2.4] 

 This Jour, xxiv, p. 239, 1907. 



Monte Ponente, Linosa. Jour. 



Castellfullit, Catalonia. This 



La Garrinada, Olot, Catalonia. 



