Eaivkins — Notes on the Geology of Rhode Island. 451 



SiO, 



AL0 3 



Fe,0> 



Feb 



MgO 



CaO 



Na,0 



K06 



H,0 , 



CO, 



MnO 



S .. 



TiO, 



Sp. Gr. 





Table II. 









f Basic Igneous Boclcs from BJwde Island. 





(A.) 



Green Schists. 







11 



12 



13 



14 



15 



66-58 



43-60 



50-87 



46-39 



41-62 



13-01 



26-90 



19-47 



18-32 



1316 



7-08 



3-20 



4-29 



6-44 



6-71 



1-40 



8-60 



7-88 



6-82 



4-48 



1-01 



2-51 



2-85 



4-66 



8-88 



2-76 



10-83 



8-99 



12-58 



17-71 



5-26 



1-75 



2-21 



1-98 



1-42 



3-44 



2-52 



2-57 



1-31 



1-08 



•16 



•64 



•73 



•73 



•72 



Tr 



"•07 



•75 



•43 

 Tr 



4-76 







•10 



•12 

 •25 



•14 



100-73 



100-62 



100-71 



100-03 



100-68 



2-844 











11. 



12. 

 13. 



14. 

 15. 



Manton, E. I. (Unaffected by granitic intrusion). A. C. Hawkins. 

 Manton, E. I. (Largely affected by intrusion). A. F. Buddington. 

 Neutaconkanut Hill, Thornton, E. I. (Slightly affected). A. C. Haw- 

 kins. 



Berkeley, E. I. (Unaffected by granitic intrusion). A. C. Hawkins. 

 Berkeley, E. I. (Somewhat affected by intrusion). A. C. Hawkins. 

 Local drift; porphyritie augites. 











Table II. 















Analyses 



of Basic Igneous Bocks from 



Bliode Island. 













(B.) 



Gabbros and Eelated Types. 











1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



SiO, .... 



22-35 



46-48 



50-48 



49-57 



44-36 



44-33 



48-43 



51-86 



46-11 



39-30 



ALA ... 



5-26 



15-69 



21-26 



12-40 



18-15 



20-58 



15-76 



15-72 



14-52 



15-58 



Fe 2 3 



14-05 



7-10 



2-05 



3-58 



5-46 



1-29 



192 





2-20 



2-65 



FeO .... 



28-84 



8-66 



6-86 



' 7-04 



11-62 



11-39 



7-68 



14-87 



4-51 



4-62 



MgO ... 



16-10 



2-74 



2-15 



5-76 



4-12 



4-79 



6-34 



5-50 



5-73 



4-00 



CaO .... 



1-17 



11-42 



7-23 



15-86 



10-19 



7-40 



10-19 



7-20 



7-82 



13-49 



Na,0 ... 



•44 



214 



303 



213 



2-65 



2-94 



2-22 





1-29 



1-27 



K,0 .... 



•10 



•70 



2-07 



2-29 



191 



•37 



1-48 





3-84 



4-03 



H 2 0+ .. 





•20 



•83 



•48 



•20 



•08 



•56 





2-90 



2-28 



H,0— .. 



•42 



•03 



•40 



•02 



•12 



•12 



•04 







•37 



TiO, .... 



10-11 



3-80 



2-00 



Tr 



1-05 



5-00 



300 



2-75 



•84 



•15 



CO, 



•02 



•28 



•95 



•26 



•64 



•68 



2-34 





7-32 



7-21 



P,0 5 .... 



•02 



•11 



•98 



•16 



Tr 



•17 



Tr 



•73 



•22* 



5-14 



S 



•38 



•80 



•08 



•77 



Tr 



•60 



•26 



•06 



1-37 



•39 



MnO .... 



•43 



Tr 



Tr 



Tr 



Tr 



Tr 



Tr 



115 



Tr 



Tr 





100-74 



100-15 

 3036 



100-53 



100-32 



100-47 



99-94 



100-26 



100-40 



99-65 



2-904 



100-25 



Sp. Gr. . 



3-92 



2-928 



2-970 



3-112 



3-203 



2-962 





2-961 



R0 5 by A. C. H. 



