->.">s II'. B, Emei'u — Jyneoux (Heology of Carrizo Mountain. 



typical diorite porphyry of Carrizo Mountain is given by Cross* 

 and is (juoted in tlie accompanying table. From this analysis 

 the norm and mode have been reckoned, and the rock deter- 

 mined to be a yellowstonose (symbol I, 4, 3, 4) lying almost on 

 the borderline between yellowstonose and tonalose. 



Hornblende-porphyrite. Sierra Carrizo.f 

 (Analysis, W. F. Hillebrand.) 



SiO a 63-18 



TiO a -60 



Al 5 O q 16-47 



Fe a O a 2-36 



FeO . 2-28 



MnO -15 



CaO 4-77 



SrO -09 



BaO -15 



M^O 1-33 



K,0 293 



Na 2 4-40 



Li a _. trace 



H a O 110° + -27 



HO] 10° - -60 



PA -28 



co a ^ 



Total 99-86 



Calculation of the Norm of Yellowstonose. 



Molecular 



Analysis Ratio Or Ab An Di Hg Mt II Ap Q 



SiO„ ... 63-18 1-053 186 426 120 44 2L 256 



TiO a ... -66 -009 9 



A1 2 3 .. 16-47 -162 31 71 60 



Fe 2 0', ..2-36-015 15 



FeO ... 2-28 -032 5 5 15 9 



MnO... -15 -002 



CaO ... 4-77 -086 60 22 6 



SrO -09 -001 



BaO ... -15 -001 



MgO... 1-33 -033 17 16 



K 2 ... 2-93 -031 31 



Na„0 .. 4-40 -071 71 



Li 2 ... tr. 



H a O 4- . -27 



11,0 - . -GO 



P s O, --- -28 -002 



Total 99-86 777. sT 71 60 22 21 15 9 2 



* Cross, "Whitman, The Laccolithic Mountain Groups of Colorado, Utah, 

 and Arizona, U. S. Geol. Survey, 14th Annual Report, Part II, 1892-1893, 

 p. 227. 



•f- Cross, Whitman, op. cit., p. 227, analysis III, by W. F. Hillebrand. 



