400 



J. B. Ferguson — Molybdenum in Rocks. 





A 



B 



C 



D 



E 



F 



58-77 



G 



H 



Si0 2 



49-74 



50-07 



62-19 



44-20 



46-99 



53-09 



56-19 



Al a 3 



12-36 



13-32 



17-43 



13-96 



17-94 



22-53 



21-16 



20-75 



Fe 2 O s 



1-64 



1-92 



1-65 



3-19 



2-56 



1-54 



1-89 



1-71 



FeO 



10-08 



9-28 



2-64 



8-41 



7-56 



1-04 



2-04 



2-19 



MgO 



8 -S3 



8-01 



0*40 



8-03 



3-22 



0-19 



0-32 



1-14 



CaO 



10-88 



10-64 



0'86 



9-79 



7-85 



0-74 



3-30 



3-53 



Na 2 



2-45 



2-16 



8-28 



3-66 



6-35 



9-62 



6-86 



2-86 



K 2 



0-55 



0-45 



5-03 



2-35 



2-62 



4-89 



8-42 



10-47 



H 2 + 



0-17 



0-49 



0-39 



0-76 



0-65 



0-90 



1-13 



0-70 



H 2 0- 



0-05 



0-22 



0-14 



0-12 







0-07 



0-24 



0-30 



co„ 



none 



none 



0-02 



none 











0-82 



none 



TiO, 



2-49 



2-70 



0-37 



4-10 



2-92 



0-31 



0-11 



0-65 



ZrO, 



trace 



none 



0-04 











o-ii 



0-04 







Mo0 3 



O'OI 



trace 



trace 



none 



none 



none 



none 



none 



p.o. 



0-41 



0-26 



0-14 



0-62 



0-94 







0-15 



0-24 



S0 3 



trace 



none 



none 











_ 



none 







CI 



o-io 



0-08 





. 



_ 







0-02 







s 



0-04 



0-11 

















0-08 





OA 



0-04 



0-05 



trace 



... 

















MnO 



0-14 



0-16 



0-32 



0-51 



trace 



trace 



0-20 



trace 



NiO 



0-05 



0-04 







0-14 



















BaO 



trace 



none 



003 







none 



none 



0-61 





SrO 



0-07 



trace 



none 























100-12* 



99-96 f 



99-93 



98-84 



99-60 



100-71 



100-48 



100-73 



* Includes : Ce 2 3 trace, V 2 3 0'02, CuO none, Li 2 none. 



f Includes : F none, Ce 2 3 none, V 2 3 none, CuO none, Li 2 none. 



A. Basalt (camptonose, III. 5. 3. 4). Haleinatimau, Kilauea. 



J. B. Ferguson, analyst. Day and Shepherd, Bull. Geol. Soc. Am., 

 xxiv, p. 586, 1913. 



B. Basalt (auvergnose, III. 5. 4. 5). Floor of crater, Kilauea. 



J. B. Ferguson, analyst. Day and Shepherd, ibid. 



C. Trachyte-obsidian (uinptekose, II.5.1.4). PuuWaaWaa, Hawaii. 



W. F. Hillebrand, analyst. W. Cross, J. Geol., xii, 514, 1904. 



D. Nephelite basanite (limbargose, III. 6.3.4). Cruz Cat, Olot, Spain. 



H. S. Washington, analyst, this Journal, xxiv, 239, 1907. 



E. Essexite (essexose, II.6.2.4). Salem Neck, Essex County, Massachusetts. 



H. S. Washington, analyst, J. Geol., vii, 57, 1899. 



F. Nephelite syenite (miaskose, 1.6.1.4). Salem Neck, Essex County, Mass. 



H. S. Washington, analyst. J. Geol., vi, 803, 1898. 



G. Nephelite syenite (beemerose, 1.6.1.3). Magnet Cove, Arkansas. 



H. S. Washington, analyst, J. Geol., ix. 611, 1901. 

 H. Leucite trachyte (vulsinose, 1.5.2.2). Lake Vico, near Viterbo, Italy. 

 H. S. Washington, analyst, Carnegie Publication No. 57, p. 36, 1906. 



As full petrographic descriptions of the two Kilauea basalts 

 have not previously been published, it will not be out of place 

 to insert them here. Dr. Whitman Cross, who has made a 



