THE 



AMERICAN JOURNAL OF SCIENCE 



[THIRD SERIES.] 



Akt. X. — Points in the Geological History of the islands 

 Maui and Oahu; by James D. Dana. With Plates 

 III and IV. 



The subjects prominently illustrated by the islands Maui and 

 Oahu are : the conditions of extinct volcanoes in different stages 

 of degradation ; the origin of long lines of precipice cutting 

 deeply through the mountains; the extent and condition of 

 one of the largest of craters at the period of extinction ; and 

 the relation of cinder and tufa cones to the parent volcano. 

 The other islands of the group present facts bearing on these 

 subjects, but the writer's knowledge of them is too imperfect 

 for review in this place. 



I. Island op Maui. 



The accompanying map, Plate 3, reduced from the recent 

 large government map,* shows the general features of the 

 island of Maui : 



(1) The volcanic mountain of East Maui, Haleakala, 10,032 

 feet in height, having at summit, a crater 2500 feet in great- 

 est depth and twenty-three miles in circuit. 



* On this Plate, as on that of Hawaii in the last volume of this Journal, most of 

 the lettering of the original map is omitted, with necessarily also minor details 

 as to erosion and topography. 



Am. Jour. Sci — Third Series, Vol. XXXVII, No. 218.— Feb., 1889. 

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