jS. Powers — Explosive Ejectamenta of Kilauea. 237 



The bed of coarse material varies in composition in the ex- 

 posures around the crater, and it is coarsest southwest of Hale- 

 maumau. At the Volcano House and at the Prisoners quarry 

 it is a gravel made up of fragments averaging an inch in 

 length. At the Crater Hotel it is coarse ash with thread-lace 

 scoria. Southwest of Halemaumau many of the fragments are 

 from \ to 2 feet long. 



On the southwest side of the sink the beds of coarse ejecta- 

 menta are overlain by thread-lace scoria whose greatest thick- 



Fig. 6. 



Fig 6. The gravelly plain south of Halemaumau showing a portion of 

 the " Peninsula " at the extreme left and the monocline in the distance on 

 the left. The bowlders scattered over the plain were ejected in the 1789 

 eruption. 



ness at the base of the monocline is little over one foot ; by 

 bombs ; and by gravel a few inches in thickness. The thread-lace 

 scoria has been blown by the wind so that what was apparently 

 at first a wide-spread deposit is now confined to protected 

 places. The bombs on the surface are uniformly of large size, 

 from a foot in length to the largest measured, 8 feet long, 6 

 feet wide, 4 feet thick, composed of a banded rock from the 

 throat of the volcano. On the "Peninsula" (fig. 6) these 

 bombs are scattered over the plain at distances apart of from 10 

 to 100 feet. Toward Keanakakoi they become less frequent, 



