abstracts: geology 503 



the west side. The axis of the valley includes a long narrow area 

 yielding flowing water that ranges widely in chemical character at 

 different depths and in different places. The report as a whole exem- 

 plifies geologic, engineering, and chemical methods for reconnaissance 

 of ground water resources in large areas. It includes records of more 

 than 8,500 wells, 500 assays and analyses, and 55 tests of pumping 

 plants. R. B. D. 



GEOLOGY. — Retreat of Barry Glacier, Port Wells, Prince William 

 Sound, Alaska, between 1910 and 1914. B. L. Johnson. U. S. 

 Geological Survey Professional Paper 98-C. Pp. 5, with illus- 

 ■ trations. 1916. 



This short paper gives the linear retreat of the Barry glacier for a 

 number of years and 6 photographs taken in different years and from 

 different points of view illustrating the face of the glacier during differ- 

 ent stages of retreat. R. W. S. 



GEOLOGY. — Ground water in the Hartford, Stamford, Salisbury, 

 Willimantic, and Saybrook areas, Connecticut. Herbert E. 

 Gregory and Arthur J. Ellis. U. S. Geological Survey Water- 

 Supply Paper No. 374. Pp. 146, with maps, sections, and views. 

 1916. 

 The areas covered by this report represent the typical geologic 

 conditions of Connecticut. The Hartford area, in the Connecticut 

 River Valley, is underlain by Triassic sediments and lavas; the Stam- 

 ford area, in the southwest corner of the State, is underlain by crystal- 

 line rocks; the Salisbury area, in the northwest corner of the State, has 

 its lowlands underlain by Cambrian or Ordovician limestone; the Wil- 

 limantic area, in the eastern highlands, is underlain by metamorphic 

 rocks of various types on which a highly varied topography has been 

 developed; the Saybrook area, at the mouth of Connecticut River, is 

 low and comparatively flat and the presence of salt water is a feature 

 of ground water problems. 



The chief water-bearing formation in all of these areas is the glacial 

 drift overlying the bedrocks. It includes unstratified drift, or till, 

 and stratified drift, or glacial outwash. The latter occurs principally 

 as valley fill and in the Connecticut Valley attains a thickness of more 

 than a hundred feet. Unstratified drift is the principal source of private 

 domestic water supplies, which are generally obtained from wells less 



