148 abstracts: geology 



crowned by 5 small glaciers of which the Whitney glacier, the largest, is 

 2l miles in length. Near the summit are several fumaroles, a residual 

 of its waning volcanic heat. J. S. D. 



GEOLOGY. — Geology and mineral resources of Kenai Peninsula, Alaska. 

 G. C. Martin, Arthur Hollick, Bertrand L. Johnson, and 

 U. S. Grant. U. S. Geological Survey Bulletin No. 587. Pp. 

 243, with maps, sections, and views. 1915. 

 The volume consists of five papers entitled: 

 General features of Kenai Peninsula. G. C. Martin. 

 The western part of Kenai Peninsula. G. C. Martin. 

 Correlation of the Kenai flora. Arthur Hollick. 

 The central and northern parts of Kenai Peninsula. Bertrand 



L. Johnson. 

 The southeastern coast of Kenai Peninsula. U. S. Grant. 

 This volume contains the results of reconnaissance investigations of 

 a region about 9400 square miles in area situated on the Pacific coast 

 of south-central Alaska. It presents a summary of what is known 

 of the geography, geology, and mineral resources. Some parts of the 

 peninsula have been studied in considerable detail, others have been 

 traversed only hastily, and information concerning considerable areas 

 is almost lacking. 



The Kenai Peninsula includes two sharply defined, and geographically 

 and geologically dissimilar, districts, the Kenai Mountains and the Kenai 

 lowland. The Kenai Mountains have a general altitude of from 3000 

 to 5000 (maximum, 6400) feet and are in large part occupied by glaciers. 

 They are composed of thoroughly indurated, partly metamorphosed, 

 and highly folded rocks that include slates and graywackes of un- 

 determined age in the main mountain mass, and Upper Triassic and 

 Lower Jurassic limestones and pyroclastics on the western border. 

 Some intrusive masses, chiefly granitic, but including also felsic (acidic) 

 dikes, are present. The Kenai lowland has a general elevation of from 

 50 to 200 (maximum, 2000) feet. It is composed of slightly indurated 

 and gently folded Tertiary (Eocene?) coal-bearing (non-marine) sands 

 and clays overlain by extensive Quarternary deposits. 



The general stratigraphic sequence in the Kenai Peninsula is as 

 follows : 



Quarternary 



Recent alluvial deposits 

 Glacial and terrace gravels 



