274: S: Powers — Notes on Hawaiian Petrology. 



The composition of the tuff in the following cones is 

 unknown : 



Near Niihau: Kaula and Lehua, tuff cones. 



Niihau : Kawaihoa, tuff cone. 



West Oahu: Pnu Kuua, scoria and lava cone, one of the 



Laeloa Craters. 

 East Oahu: Makalapu Crater, interstratined tuff and coral 



limestone. 

 Moku Maui, Moknlua, and Rabbit Islands, dissected tuff 



cones. 

 East Mani-Kahoolawe : 



Molokini Island, tuff cone. 



Known occurrences of nephelite-bearing rocks other 

 than those listed above are given by Doctor Cross as fol- 

 lows : The first three localities are near together and 

 the rocks probably came from one or more flows of a 

 single young and unde scribed crater. The fourth local- 

 ity, a dike, may have been one of the feeders of the tuff 

 cones. 



Oahu : Kalili Valley, north edge, nephelite-melilite basalt. 

 Gulick Stream, west of Kamehameha School, nephelite- 

 melilite basalt, 

 Half a mile east of Bishop Mnseum, nephelite-melilite 



basalt. 

 Dike in the Pali, east side, nephelite basalt. 

 West Molokai: Kalge (north of Kaunakakei on the road to 



Kalaupapa), nephelite basinite. (Mohle) 24 

 West Maui: Waihee Valley (?) 



Near Lahaina (Mohle) 

 East Maui : Near Vierra's Ranch, Kanpo Gap. 



All the proved occurrences of nephelite rocks, with pos- 

 sibly four to six exceptions, fall into natural groups : a 

 solitary tuff cone on the eastern shore of Kauai ; the five 

 Laeloa Craters of West Oahu, roughly aligned on the 

 dissected south flank of the old volcano; six to nine 

 craters in the formerly submerged area of East Oahu near 

 Honolulu, and the two or more cones in the faulted and 

 deeply dissected region of East Oahu 12 miles northeast 

 of Honolulu. The age of the cones of East Oahu is 

 Pleistocene, as the age of the coral reefs through which 

 they broke is either Pliocene or Pleistocene. The tuff 

 cones of the other islands appear to have suffered the 

 same amount of erosion as those of East Oahu and they 



21 Xeues Jahrb., Beilag. Band 15, pp. 67-71, 1902. 



