Pirsson and Washington — Geology of New Hampshire. 495 



Analyses of Camptonose and related Eocks. 





I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



Si0 2 .__. 



43-94 



46-99 



43-65 



42-73 



41-63 



732 



45-32 



A1„0 3 .. 



16-17 



17-94 



11-48 



14-50 



13-26 



159 



18-99 



Fe" o 3 .. 



3-96 



2-56 



6-32 



4-03 



3-19 



025 



3-78 



FeO ... 



10-06 



7-56 



8-00 



7-28 



9-92 



140 



9-78 



M<?0__. 



5-05 



3-22 



7*92 



5-46 



7*31 



126 



4-68 



CaO,.-. 



9-59 



7-85 



14-00 



8-46 



8-86 



171 



9-19 



Na 2 0__. 



2-93 



6-35 



2-28 



3'11 



2-49 



047 



3-78 



K,0.— 



1-51 



2-62 



151 



2-28 



3-32 



016 



2-12 



h;oho° 



+ 1-42 



0-65 



1-00 



3-08 



1-35 







0-31 



h;ouo° 



— 0-13 











0-36 











0-09 



co,.___ 



0-09 











3-76 



5-20 



002 







Ti0 o ... 



4-13 



2-92 



1-09 



4-30 



3-95 



052 



1-94 



P.O.— 



s 



Cl 



0-69 



•94 



trace 



•63 



•18 

 trace 



? 



005 



















3 9 __. 













none 







.. _ . 





NiO.„. 















trace 













MnO .._ 



tr 



tr 







•19 



•27 . 



_ _ , 





BaO-__. 



none 



none 



» 



trace 







... 







Total... 



99-67 



99-60 



100-16 



100-65 



100-75 . 





99-98 



o=s_. 















•05 









100-60 



I. Gilfordal-camptonose (essexite). West foot of Locke's Hill, 

 Belknap Mts. New Hampshire. H. S. Washington analyst. 



II. Hornblende grano-essexose (essexite). Salem Neck, Mass. 

 H. S. Washington analyst (Jour. Geol. vii, p. 57, 1899). 



III. Grano-limburgose. Brandberget, Gran, Norway ; (Brogger, 

 Quar. Jour. Geol. Soc, vol. 50, p. 19, 1894). L. Schmelck anal. 



IV. Hornblende phyro-camptonose. Summit of Mt. Gunstock, 

 Belknap Mts. New Hampshire. H. S. Washington analyst. 



Y. Hornblende ourose (camptonite). Livermore Falls, Camp- 

 ton, New Hampshire. G. W. Hawes (this Jour. (3), vol. xvii, 

 147, 1879). 



VI. Molecular ratios of No. 1. 



VII. Hornblende grano-salemose (hornblende gabbro). Salem 

 Neck, Mass. H. S. Washington (Jour. Geol. vii, p. 63, 1899). 



ences; the rock of No. VII, described by one of us, is most 

 nearly like it. Further discussion of this point is deferred until 

 the classification is taken up. It is to be noted how closely it 

 resembles in composition the camptonose dike rocks of this area 

 as shown by a comparison with No. IV, and indeed it is essen- 

 tially the same type of magma as that which furnishes the rocks 

 classified in general as camptonites. This is seen from the 

 analysis by Hawes of one from the type locality. Brogger* 



*Basic Eruptive Eocks of Gran, Quar. Jour. Geoi. Soc, 1, p. 26, 1894. 



