S. Powers — Notes on Hawaiian Petrology. 269 



most salic lava known on the islands is one described by 

 A. B. Lyons from the Waimea side of the Kohala Moun- 

 tains, 18 Hawaii. Several new occurrences of trachyte 

 were found by the writer on West Maui (fig. 3) : 

 on the northeast side of the volcano between Waihee and 

 Kahakuloa gulches ; on the north side between Honoka- 

 hau and Honakahua gulches; and on the south side in 

 the vicinity of Olowalu. One new occurrence was a so 

 found on Molokai. 



On Hawaii the trachyte described by Dr. Cross from 

 Puu Waawaa and from Puu Anahulu occurs in the former 

 case as a cone of stratified ash, in the latter case as a 

 terrace presenting steep faces on the south and west 

 sides. Puu Waawaa is dissected by many ravines and is 

 much older than the flows from Mauna Hualalai which 

 surround it. The Puu Anahulu terrace, as seen from the 

 south, appears to form a slope more nearly horizontal 

 than that over which the flows from the south have 

 streamed, but as seen from the north the terrace is clearly 

 a portion of the normal slope of Mauna Kea. The terrace 

 has been overrun by a pahoehoe basalt flow which may 

 be seen to overlie the rough surface of the trachyte. 



The Puu Anahulu trachyte represents a flow at least 5 

 miles in length and over 100 feet in thickness at the 

 lower end. The source of the flow is believed to have 

 been one of the visible volcanoes. Moreover, the conclu- 

 sion is reached from a comparison of features at Puu 

 Anahulu and Puu Waawaa with those of flows from 

 Mauna Loa and of tuff cones on Oahu that no great age 

 can be assigned to the trachyte of either of these oc- 

 currences and that the terrace represents a normal slope 

 rather than an uplift or wave-cut bench. A careful 

 search for elevated shorelines around the island of 

 Hawaii from sea-level to an elevation of over 1,500 feet, 

 made by Dr. T. A. Jaggar and the writer, showed sea- 

 worn coral fragments and beach pebbles at various ele- 

 vations up to 1,325 feet (at the residence of Miss Paris, 

 Kealakakua), but as the Hawaiians carried such material 

 inland long distances for house sites and for religious 

 purposes, no positive proof of recent elevation of over 20 

 feet (that at Mahukona) anywhere around the island was 

 found. 19 



18 Idem, (4), vol. 2, pp. 421-9, 1896. 



19 C. E. Dutton (Hawaiian Volcanoes, U. S. Geol. Surv., 4th Ann. Kept., 

 1882-3, p. 98) speaks of three terraces at Hilea indicating uplift. Examina- 

 tion of similar terraces in several places showed that they have been con- 

 structed by lava flows. 



