GEOLOGY 



The work conducted under the direction of the state geologist 

 during the fiscal year just ended may be summarized as follows: 



Maps 



The office work of the past winter was mainly devoted to the 

 completion for publication of the geologic map of the State on 

 the scale of 5 miles to the inch, which -went to the engraver in 

 April and on which considerable time was spent in proofread- 

 ing during the summer. It is expected that this map will be 

 issued about the first of the new year and a detailed description 

 of it will be given in Museum bulletin 56. 



An important contribution to the physical geography of the 

 State is in the form of a hypsometric map on the scale of 12 

 miles to the inch, compiled under the direction of the state geolo- 

 gist, by Mr C. C. Vermeule, which shows the topography of the 

 State in contour lines 200 feet apart. This map is contained in 

 the pocket of this report and will be found of much use to 

 students of geography and physiography. 



The geology of the crystalline rocks of New York and vicinity 

 was replotted on the revised proofs of the Harlem, Brooklyn and 

 Staten Island quadrangles and together with the accompanying 

 text was forwarded to the United States Geological Survey at 

 Washington for publication in the forthcoming New York folio. 

 Duplicates of these maps and of the accompanying text will be 

 issued by the Museum. 



Pre-Cambrian and crystalline rocks 



Prof. H. P. Cushing of Adelbert College who has been for 

 several seasons engaged in the study of the crystalline rocks 

 of the Adirondacks, during the past year devoted himself to a 

 special study of the area about Little Falls, Herkimer co. As 

 the result of this work, he has mapped the structural geology 

 of the Little Falls quadrangle, which will soon be ready for 

 publication as a bulletin of the State Museum. 



The main purpose of the work was the investigation of the 

 pre-Cambrian rocks, but incidentally the Paleozoic rocks were 

 also mapped on the new base. 



